1.ApplicationNumber: US-201214127779-A
1.PublishNumber: US-9023852-B2
2.Date Publish: 20150505
3.Inventor: GRIFFIOEN GERARD
NETTEKOVEN MATTHIAS
PRINCEN KATRIEN
RATNI HASANE
VIFIAN WALTER

4.Inventor Harmonized: GRIFFIOEN GERARD(BE)
NETTEKOVEN MATTHIAS(DE)
PRINCEN KATRIEN(BE)
RATNI HASANE(FR)
VIFIAN WALTER(CH)

5.Country: US
6.Claims:
(en)The present invention relates to a compound of formula (IA) The present invention also relates to the use of the compound of formula IA for treating certain neurodegenerative disorders characterized by cytotoxic TAU misfolding and/or aggregation.

7.Description:
(en)RELATED APPLICATIONS
This application is a 35 U.S.C. §371 filing of International Application No. PCT/EP2012/062778, filed Jun. 29, 2012; which claims priority to European Patent Application No. 11172324.3, filed on Jul. 1, 2011. The entire contents of each are incorporated herein by reference.
FIELD OF THE INVENTION
The present invention relates to arylthiadiazoles and their use for treating certain neurodegenerative disorders characterized by cytotoxic TAU misfolding and/or aggregation.
BACKGROUND OF THE INVENTION
TAU is a protein with the ability to bind- and consequently stabilise and define-microtubule structure and function in neurons. The binding of TAU to microtubules is regulated by phosphorylation of TAU; several TAU phosphorylation sites and their corresponding kinases have been identified which control phosphorylation status of TAU and consequently modulate the affinity of TAU-binding to microtubules.
Tauopathies are characterised by insoluble aggregates or polymers of hyperphosphorylated TAU which are formed by self-polymerisation of TAU monomers.
An important aspect of the TAU aggregation is its associated cytotoxicity, which reduces neuronal integrity and functionality and ultimately resulting in disease symptoms. A direct role of TAU in disease onset has been established unequivocally by the elucidation of familial mutations in TAU, which appear to be responsible for a very early and sometimes aggressive form of tauopathy. Such mutations comprise changes in the amino acid sequence of TAU that—directly or indirectly promote neurotoxic aggregation.
Alzheimer's disease is the best known of these, where TAU protein is deposited within neurons in the form of neurofibrillary tangles (NFTs). They were first described by the eponymous Alois Alzheimer in one of his patients suffering from the disorder.
Currently used treatments for tauopathies, including Alzheimer's disease, offer only symptomatic benefit without impacting the underlying neurodegeneration.
WO2007/090617 discloses substituted 1,2,4-thiadiazole derivatives for use in the treatment of an α-synucleopathy such as Parkinson's disease, diffuse Lewy body disease, traumatic brain injury, amyotrophic lateral sclerosis, Niemann-Pick disease, Hallervorden-Spatz syndrome, Down syndrome, neuroaxonal dystrophy, multiple system atrophy and Alzheimer's disease.
Treatments aimed to suppress cytotoxic TAU misfolding and/or aggregation, in order to delay or halt the progression of disease, are presently not available. Thus there is a need for new treatments that target the underlying molecular mechanism of noxious TAU misfolding and/or aggregation in order to reduce neuronal cell death and/or degeneration in patients suffering from tauopathies such as Alzheimer's disease (AD).
SUMMARY OF THE INVENTION
A first aspect of the present invention relates to compounds of formula IA

wherein
R 1 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; lower alkoxy substituted by halogen; or cyano; R 2 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; or is lower alkoxy substituted by halogen; C 1 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; C 2 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; X is —CH—; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —CHR′—CH 2 —;












R is hydrogen; hydroxyl; halogen or lower alkyl;
R′ is lower alkyl;


n is 1 or 2; if n is 2, R 1 may be independently selected from each other;
o is 1 or 2; if o is 2, R 2 may be independently selected from each other;

or to a pharmaceutically active salt thereof to a stereoisomeric form, including an individual diastereoisomer or enantiomer of the compound of formula IA as well as to a racemic or non-racemic mixture thereof.



A second aspect of the invention relates to a process for preparation of compounds of formula AI according to a first aspect of the invention, which process comprises
coupling a compound of formula

with a compound of formula


to give a compound of formula


wherein the definitions are as described in the first aspect of the invention, wherein PG is hydrogen or a protecting group, wherein hal is a halogen or

if desired, converting the compounds obtained into pharmaceutically acceptable acid addition salts.
A third aspect of the invention relates to a medicament containing one or more compounds according to the first aspect of the invention and pharmaceutically acceptable excipients.
A fourth aspect of the invention relates to a medicament according to the third aspect, for use in the treatment of a disease selected from the group consisting of are Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia, and parkinsonism (linked to chromosome 17, FTDP-17).
A fifth aspect of the invention relates to the use of a compound according to the first aspect of the invention for the manufacture of medicaments for the treatment of Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17).
A sixth aspect of the invention relates to a method for the treatment of Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17), which method comprising administering an effective amount of a compound as defined in the first aspect of the invention.


DETAILED DESCRIPTION
In an embodiment, the present invention encompasses a compound of formula IA, wherein,
R 1 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; lower alkoxy substituted by halogen; or is cyano; preferably R 1 is lower alkyl substituted by halogen; halogen; or lower alkoxy; preferably R 1 is lower alkyl substituted by halogen; or halogen;

R 2 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; or is lower alkoxy substituted by halogen; preferably R 2 is hydrogen; lower alkyl; halogen; or is lower alkoxy; preferably R 2 is hydrogen; halogen; or is lower alkoxy;

C 1 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; or tetrahydro-2H-pyran-4-yl; preferably C 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; or piperidin-lyl; preferably C 1 is phenyl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; or piperidin-lyl; preferably C 1 is phenyl; pyridine-3-yl; pyridine-4-yl; or pyridazin-4-yl; preferably C 1 is phenyl; or pyridine-3-yl;

C 2 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 2 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 2 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 2 is phenyl; pyridine-3-yl; pyridine-4-yl; or tetrahydro-2H-pyran-4-yl; preferably C 2 is phenyl; pyridine-3-yl; pyridine-4-yl; or tetrahydro-2H-pyran-4-yl;

X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —CHR′—CH 2 —;


preferably X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CHR′—CH 2 —; or


preferably X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; or —CHR′—CH 2 —; preferably X is —CH 2 —; —CH 2 —CHR—; or —CHR′—CH 2 —;

R is hydrogen; hydroxyl; halogen or lower alkyl; preferably R is hydrogen; halogen or lower alkyl; preferably R is hydrogen or halogen;

n is 1 or 2; if n is 2, R 1 may be independently from each other; preferably n is 1;

o is 1 or 2; if o is 2, R 2 may be independently from each other; preferably o is 1.

In an embodiment, the invention provides compounds of formula IA wherein
R 1 is hydrogen; C 1-6 alkyl; C 1-6 alkyl substituted by halogen; halogen; lower alkoxy; C 1-6 alkoxy substituted by halogen; or is cyano; preferably R 1 is C 1-6 alkyl substituted by halogen; halogen; or C 1-6 alkoxy; preferably R 1 is C 1-6 alkyl substituted by halogen; or halogen;

R 2 is hydrogen; C 1-6 alkyl; C 1-6 alkyl substituted by halogen; halogen; C 1-6 alkoxy; or is C 1-6 alkoxy substituted by halogen; preferably R 2 is hydrogen; C 1-6 alkyl; halogen; or is C 1-6 alkoxy; preferably R 2 is hydrogen; halogen; or is C 1-6 alkoxy;

C 1 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; or tetrahydro-2H-pyran-4-yl; preferably C 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; or piperidin-lyl; preferably C 1 is phenyl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; or piperidin-lyl; preferably C 1 is phenyl; pyridine-3-yl; pyridine-4-yl; or pyridazin-4-yl; preferably C 1 is phenyl; or pyridine-3-yl;

C 2 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 2 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; pyrimidin-5-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 2 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; piperidin-lyl; tetrahydro-2H-pyran-4-yl; or cycloalkyl; preferably C 2 is phenyl; pyridine-3-yl; pyridine-4-yl; or tetrahydro-2H-pyran-4-yl; preferably C 2 is phenyl; pyridine-3-yl; pyridine-4-yl; or tetrahydro-2H-pyran-4-yl;

X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —CHR′—CH 2 —;


preferably X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CHR′—CH 2 —; or


preferably X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; or —CHR′—CH 2 —; preferably X is —CH 2 —; —CH 2 —CHR—; or —CHR′—CH 2 —;

R is hydrogen; hydroxyl; halogen or C 1-6 alkyl; preferably R is hydrogen; halogen or C 1-6 alkyl; preferably R is hydrogen or halogen;

n is 1 or 2; if n is 2, R 1 may be independently from each other; preferably n is 1;

o is 1 or 2; if o is 2, R 2 may be independently from each other; preferably o is 1.

In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is selected from: phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; pyridazin-4-yl; or pyrimidin-5-yl.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 2 is selected from: phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; tetrahydro-2H-pyran-4-yl; or cycloalkyl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and C 2 is phenyl; yet more in particular C 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 1 is pyridine-3-yl.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is phenyl and C 2 is phenyl.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is phenyl; C 2 is phenyl and n is 1.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is phenyl; C 2 is phenyl and n is 2.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is phenyl; C 2 is phenyl and o is 1.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is phenyl; C 2 is phenyl and o is 2.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is phenyl and C 2 is tetrahydro-2H-pyran-4-yl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and C 2 is tetrahydro-2H-pyran-4-yl; yet more in particular C 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 1 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is phenyl; and C 2 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; yet more in particular C 2 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 2 is pyridine-3-yl.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA, wherein C 1 is pyridazin-4-yl and C 2 is phenyl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and C 2 is pyridine-3-yl; yet more in particular C 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 1 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and C 2 is pyridine-4-yl; yet more in particular C 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 1 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is pyridine-3-yl; and C 2 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; yet more in particular C 2 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 2 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula IA, whereby C 1 is pyridine-4-yl; and C 2 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; yet more in particular C 2 is pyridine-3-yl; or pyridine-4-yl; yet more in particular C 2 is pyridine-3-yl.
In a particular embodiment, the present invention relates to the following compounds, uses, medicaments and processes:
E1. A compound of formula I

wherein
R 1 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; lower alkoxy substituted by halogen; or cyano; R 2 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; or is lower alkoxy substituted by halogen; A 1 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; or cycloalkyl; A 2 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; or cycloalkyl; X is a bond; —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —C(O)NH—; —CHR′—CH 2 —;


preferably is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —CHR′—CH 2 —;












R is hydrogen; hydroxyl; halogen; or lower alkyl;
R′ is lower alkyl;


n is 1 or 2; if n is 2, R 1 may be independently from each other;
o is 1 or 2; if o is 2, R 2 may be independently from each other;

or a pharmaceutically active salt thereof, a stereoisomeric form, including an individual diastereoisomer or enantiomer of the compound of formula (I) as well as a racemic or non-racemic mixture thereof.



E2. A compound of formula I according to E1, wherein A 1 and A 2 are both phenyl.
E3. Compound of formula I according to E2, which compounds are
1-(2,4-Dichloro-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-Phenethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[2-(3,4-Dichloro-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-phenyl)-ethyl]-piperazine 1-[2-(3-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-m-tolyl-ethyl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-p-tolyl-ethyl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-fluoro-phenyl)-ethyl]-piperazine 1-[2-(2-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(3-methoxy-phenyl)-propyl]-piperazine 1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(2-methoxy-phenyl)-propyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-ethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-isopropoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(4-methoxy-phenyl)-propyl]-piperazine 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanone 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanol 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-allyl]-piperazine 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanone 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanol 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanone 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanol 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[1-(4-Chloro-phenyl)-cyclopropylmethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-difluoromethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-difluoromethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-isopropoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-propyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-1-methyl-ethyl]-piperazine 4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-4-methoxy-phenyl)-ethyl]-piperazine 3-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 4-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile 3-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile 4-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile 3-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 3-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 4-(5-{4-[2-(3-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine or 4-(5-{4-[2-(4-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile.

E4. A compound of formula I according to E1, wherein at least one of A 1 or A 2 is pyridine-2-yl, pyridine-3-yl or pyridine-4-yl.
E5. Compounds of formula I according to E4, which compounds are
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(6-M ethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 4-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 1-(2-Methyl-benzyl)-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine or 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine.

E6. A compound of formula I according to E1, wherein one of A 1 or A 2 is benzo[1,3]dioxol.
E7. A compound of formula I according to E6, which compound is
1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine.

E8. A compound of formula I according to E1, wherein at least one of A 1 or A 2 is thiophen-2-yl.
E9. Compound of formula I according to E8, which compounds are
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine or 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine.

E10. A compound of formula I according to E1, wherein at least one of A 1 or A 2 are pyrazine-2-yl.
E11. Compounds of formula I according to E10, which compounds are
2-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-pyrazine or 2-(5-{4-[2-(3-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-pyrazine.

E12. A compound of formula I according to E1, wherein A 2 is cycloalkyl.
E13. Compounds of formula I according to E12, which compounds are
1-(2-Cyclohexyl-ethyl)-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine or 1-(2-Cyclohexyl-ethyl)-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine.

E14. A process for preparation of compounds of formula I according to E1, which process comprises
coupling a compound of formula

with a compound of formula


to give a compound of formula


wherein the definitions are as described in E1, or

if desired, converting the compounds obtained into pharmaceutically acceptable acid addition salts.
E15. A compound according to any one of E1-E13, when manufactured according to a process of E14.
E16. A compound according to any one of E1-E13 for use as therapeutically active substance.
E17. A medicament containing one or more compounds as described in any one of E1 to E13 and pharmaceutically acceptable excipients.
E18. A medicament according to E17, wherein the illnesses which may be treated are Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17).
E19. The use of a compound as claimed in any one of E1 to E13 for the treatment of Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17).
E20. The use of a compound as claimed in any one of E1 to E13 for the manufacture of medicaments for the treatment of Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17).
E21. A method for the treatment of Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17), which method comprising administering an effective amount of a compound as defined in any one of E1-E13.
E22. The invention as described herein.
In an embodiment, the compounds of formula IA have a structure of formula I.
For example, the present invention encompasses a compound of formula I or IA, wherein C 1 has the same meaning as defined for A 1 and C 2 has the same meaning as defined for A 2 ; wherein,
R 1 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; lower alkoxy substituted by halogen; or is cyano; preferably R 1 is lower alkyl substituted by halogen; halogen; or lower alkoxy; preferably R 1 is lower alkyl substituted by halogen; or halogen;

R 2 is hydrogen; lower alkyl; lower alkyl substituted by halogen; halogen; lower alkoxy; or is lower alkoxy substituted by halogen; preferably R 2 is hydrogen; lower alkyl; halogen; or is lower alkoxy; preferably R 2 is hydrogen; halogen; or is lower alkoxy;

A 1 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; or cycloalkyl; preferably A 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; or cycloalkyl; preferably A 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; or cycloalkyl; preferably A 1 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; or pyrazine-2-yl; preferably A 1 is phenyl; pyridine-3-yl or pyridine-4-yl; preferably A 1 is phenyl; or pyridine-3-yl;

A 2 is phenyl; benzo[1,3]dioxol; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; thiophen-2-yl; or cycloalkyl; preferably A 2 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; thiophen-2-yl; pyrazine-2-yl; or cycloalkyl; preferably A 2 is phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; or pyrazine-2-yl; preferably A 2 is phenyl; pyridine-3-yl; pyridine-4-yl; or pyrazine-2-yl; preferably A 2 is phenyl; pyridine-3-yl; or pyridine-4-yl;

X is a bond; —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —C(O)NH—; —CHR′—CH 2 —;


preferably X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —CHR′—CH 2 —;


preferably X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CHR′—CH 2 —; or


preferably X is —CH 2 —; —CH 2 —CHR—; —CHR′—CH 2 —;

R is hydrogen; hydroxyl; halogen; or lower alkyl; preferably R is hydrogen; halogen or lower alkyl; preferably R is hydrogen or halogen;

R′ is lower alkyl;

n is 1 or 2; if n is 2, R 1 may be independently from each other; preferably n is 1;

o is 1 or 2; if o is 2, R 2 may be independently from each other;

In a yet more particular embodiment, the compounds of the present invention have a structure according to formula I or IA, whereby X is —CH 2 —; —CH 2 —CHR—; —CH 2 —CH 2 —CH 2 —; —CH 2 C(O)—; —CHR′—CH 2 —;









In a particular embodiment of the present invention, the compounds have a structure according to formula IA or formula I, wherein X is selected from —CH 2 —CHR—; or —CHR′—CH 2 —. In yet another particular embodiment, R is selected from hydrogen or lower alkyl. In a yet more particular embodiment, R is hydrogen.
In another particular embodiment of the present invention, the compounds have a structure according to formula IA or formula I, wherein X is selected from —CH 2 —CHR—; or —CHR′—CH 2 —. In yet another particular embodiment, R is hydrogen. In another particular embodiment of the present invention, the compounds have a structure according to formula I, wherein A 1 is selected from: phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl.
In another particular embodiment of the present invention, the compounds have a structure according to formula I, wherein A 2 is selected from: phenyl; pyridine-2-yl; pyridine-3-yl; pyridine-4-yl; pyrazine-2-yl; or cycloalkyl.
In a particular embodiment of the invention, the compounds have a structure of formula I, whereby A 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and A 2 is phenyl; yet more in particular A 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular A 1 is pyridine-3-yl.
In another particular embodiment of the present invention, the compounds have a structure according to formula I, wherein A 1 is phenyl; A 2 is phenyl and n is 1.
In another particular embodiment of the present invention, the compounds have a structure according to formula I, wherein A 1 is phenyl; A 2 is phenyl and n is 2.
In another particular embodiment of the present invention, the compounds have a structure according to formula I, wherein A 1 is phenyl; A 2 is phenyl and o is 1.
In another particular embodiment of the present invention, the compounds have a structure according to formula I, wherein A 1 is phenyl; A 2 is phenyl and o is 2.
In a particular embodiment of the invention, the compounds have a structure of formula I, whereby A 1 is phenyl; and A 2 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; yet more in particular A 2 is pyridine-3-yl; or pyridine-4-yl; yet more in particular A 2 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula I, whereby A 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and A 2 is pyridine-3-yl; yet more in particular A 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular A 1 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula I, whereby A 1 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; and A 2 is pyridine-4-yl; yet more in particular A 1 is pyridine-3-yl; or pyridine-4-yl; yet more in particular A 1 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula I, whereby A 1 is pyridine-3-yl; and A 2 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; yet more in particular A 2 is pyridine-3-yl; or pyridine-4-yl; yet more in particular A 2 is pyridine-3-yl.
In a particular embodiment of the invention, the compounds have a structure of formula I, whereby A 1 is pyridine-4-yl; and A 2 is pyridine-2-yl; pyridine-3-yl; or pyridine-4-yl; yet more in particular A 2 is pyridine-3-yl; or pyridine-4-yl; yet more in particular A 2 is pyridine-3-yl.
The present compounds are useful for treating certain neurodegenerative disorders characterized by cytotoxic TAU misfolding and/or aggregation in order to delay or halt the progression of such diseases. Such diseases are summarized under the term tauopathy. The term “Tauopathy” refers to a disease characterised by dysfunctioning and/or toxicity of the TAU protein, characterised by oligomers, aggregates or polymers of said protein. Such diseases include, but are not limited to, Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17).
Tauopathies are characterised by insoluble aggregates or polymers of hyperphosphorylated TAU which are formed by self-polymerisation of TAU monomers. The precise molecular mechanisms involved in TAU aggregation are not precisely known, but may involve a partial denaturation or misfolding of TAU in conformations which have a high propensity to self-organise into higher order structures. The misfolding and aggregation may be triggered by hyperphosphorylation of TAU, although at present, it cannot be excluded that such aberrant phosphorylation is a consequence rather than the cause of aggregation.
TAU is a protein with the ability to bind- and consequently stabilise and define-microtubule structure and function in neurons. The binding of TAU to microtubules is regulated by phosphorylation of TAU; several TAU phosphorylation sites and their corresponding kinases have been identified which control phosphorylation status of TAU and consequently modulate the affinity of TAU-binding to microtubules.
An important aspect of the TAU aggregation is its associated cytotoxicity, which reduces neuronal integrity and functionality and ultimately resulting in disease symptoms. A direct role of TAU in disease onset has been established unequivocally by the elucidation of familial mutations in TAU, which appear to be responsible for a very early and sometimes aggressive form of tauopathy. Such mutations comprise changes in the amino acid sequence of TAU that—directly or indirectly promote neurotoxic aggregation.
Alzheimer's disease is the best known of these, where TAU protein is deposited within neurons in the form of neurofibrillary tangles (NFTs). They were first described by the eponymous Alois Alzheimer in one of his patients suffering from the disorder. The term “Alzheimer's disease” as used herein, refers to a chronic progressive nervous disease characterised by neurodegeneration with as most important (early) symptom being memory loss. As the disease advances, symptoms may include confusion, irritability and aggression, mood swings, language breakdown, long-term memory loss, and the general withdrawal of the sufferer as their senses decline.
Tangles are formed by hyperphosphorylation of a microtubule-associated protein known as TAU, causing it to aggregate in an insoluble form. (These aggregations of hyperphosphorylated TAU protein are also referred to as PHF, or “paired helical filaments”). The precise mechanism of tangle formation is not completely understood, and it is still controversial whether tangles are a primary causative factor in the disease or play a more peripheral role. AD is also classified as an amyloidosis because of the presence of senile plaques.
Other conditions in which neurofibrillary tangles are commonly observed include: Progressive supranuclear palsy, dementia pugilistica (chronic traumatic encephalopathy), frontotemporal dementia and parkinsonism linked to chromosome 17, Lytico-Bodig disease (Parkinson-dementia complex of Guam), tangle-predominant dementia with NFTs, similar to AD, but without plaques, ganglioglioma and gangliocytoma, meningioangiomatosis, subacute sclerosing panencephalitis, tuberous sclerosis, Hallervorden-Spatz disease, and lipofuscinosis.
The non-Alzheimer's tauopathies are sometimes grouped together as “Pick's complex”. In Pick's disease and corticobasal degeneration TAU proteins are deposited in the form of inclusion bodies within swollen or “ballooned” neurons. Argyrophilic grain disease (AGD), another type of dementia, is marked by the presence of abundant argyrophilic grains and coiled bodies on microscopic examination of brain tissue.
Similar compounds as described in formula IA and I of the present invention have been described in WO2007/090617.
In contradiction to the findings in WO2007/090617, it has been found that if there is no linking group between the phenyl moiety and the thiadiazole group, there was a marked decrease of the clearance (Clint), in particular in the human in-vitro microsomes assay. It is very important for a drug to have a moderate or low clearance, as this often leads to a higher oral bioavailability. Reducing the clearance of a compound/drug, could then potentially reduce drastically the daily dose required for efficacy and therefore give also a much better safety profile as well. Therefore a low clearance is an essential feature for therapeutic applicability.
The following examples in the table below highlight these finding, where the use of compounds, wherein no linking group between the phenyl moiety and the thiadiazole group exists, have led to compounds with a lower clearance (Clint) and higher metabolic stability (MAB) in human in vitro microsomes.
Microsomal Stability Testing—Assay Description
The microsomal stability assay measures the rate of disappearance of a test compound from an incubation containing human or animal liver microsomes and metabolic cofactors (typically NADPH). The assay is primarily used for ranking the relative CYP-mediated metabolism propensities of compounds within a chemical series and as a guide to selecting sufficiently stable compounds for pharmacokinetics and pharmacodynamics experiments. [In addition to CYPs, microsomally located enzymes which also make use of NADPH (such as flavone mono-oxygenases) and those which require no cofactors (such as carboxylesterases) are active.]
Incubations are performed in 96-well deep-well plates with a final incubation volume of 600 μL. Incubations contain (finally) 1-2 μM test compound, 0.5 mg/mL liver microsomes (typically human, rat or mouse) and NADPH regenerating system. 50 μL aliquots are removed after 1, 3, 6, 9, 15, 25, 35 and 45 minutes and quenched in 150 μL acetonitrile containing internal standard. Samples are then cooled and centrifuged before analysis by LC-MS/MS.
Log peak area ratio (test compound peak area/internal standard peak area) is plotted against incubation time and a linear fit made to the data with emphasis upon the initial rate of compound disappearance. The slope of the fit is then used to calculate the intrinsic clearance:

Cl int (μL/min/mg)=−slope(min −1 )*1000/[protein concentration (mg/mL)]









TABLE 1



Compounds disclosed in
MAB and
Compounds disclosed in
MAB and

WO2007/090617
Clint data
the present application
Clint data




  According to WO2007/090617
Clint. (Hum/Rat) 39/482 uL/min/mg protein

  Example 2
Clint. (Hum/Rat) 19/48 uL/min/mg protein




  According to WO2007/090617
Clint. (Hum/Rat) 46/103 uL/min/mg protein

  Example 88
Clint. (Hum/Rat) 12/23 uL/min/mg protein




















As it can be seen in the table above, it has been found a marked increase of metabolic stability (increase MAB, decrease of the clearance Clint) in particular in human in vitro microsomes.
Objects of the present invention are new compounds of formula IA and I and their pharmaceutically acceptable salts, their use for the treatment of diseases related to the biological function of dysfunction of TAU protein, which diseases comprise Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17), their manufacture and medicaments based on a compound in accordance with the invention in the control or prevention of illnesses.
The preferred indication using the compounds of the present invention is Alzheimer's disease.
As used herein, the term “lower alkyl” denotes a saturated straight- or branched-chain group containing from 1 to 7 carbon atoms, preferably from 1 to 6 carbon atoms, for example, methyl, ethyl, propyl, isopropyl, n-butyl, i-butyl, 2-butyl, t-butyl and the like. Preferred alkyl groups are groups with 1-4 carbon atoms.
As used herein, the term “lower alkoxy” denotes a group wherein the alkyl residue is as defined above and which is attached via an oxygen atom.
As used herein, the term “lower alkyl substituted by halogen” denotes an alkyl group as defined above, wherein at least one hydrogen atom is replaced by halogen, for example CF 3 , CHF 2 , CH 2 F, CH 2 CF 3 , CH 2 CH 2 CF 3 , CH 2 CF 2 CF 3 and the like.
As used herein, the term “lower alkoxy substituted by halogen” denotes an alkoxyl group as defined above, wherein at least one hydrogen atom is replaced by halogen, for example OCF 3 , OCHF 2 , OCH 2 F, OCH 2 CF 3 , OCH 2 CH 2 CF 3 , OCH 2 CF 2 CF 3 and the like.
The term “halogen” denotes chlorine, iodine, fluorine and bromine.
The term “cycloalkyl” is an alkylene ring, containing from 3 to 6 carbon ring atoms. Preferred is cyclopropyl.
The term “pharmaceutically acceptable acid addition salts” embraces salts with inorganic and organic acids, such as hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, citric acid, formic acid, fumaric acid, maleic acid, acetic acid, succinic acid, tartaric acid, methane-sulfonic acid, p-toluenesulfonic acid and the like.
One embodiment of the invention are compounds of formula IA, wherein C 1 and C 2 are both phenyl, for example the following compounds
1-(2,4-Dichloro-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-Phenethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[2-(3,4-Dichloro-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-phenyl)-ethyl]-piperazine 1-[2-(3-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-m-tolyl-ethyl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-p-tolyl-ethyl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-fluoro-phenyl)-ethyl]-piperazine 1-[2-(2-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(3-methoxy-phenyl)-propyl]-piperazine 1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(2-methoxy-phenyl)-propyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-ethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-isopropoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(4-methoxy-phenyl)-propyl]-piperazine 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanone 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanol 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-allyl]-piperazine 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanone 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanol 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanone 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanol 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[1-(4-Chloro-phenyl)-cyclopropylmethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-difluoromethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-difluoromethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-isopropoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-propyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-1-methyl-ethyl]-piperazine 4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-4-methoxy-phenyl)-ethyl]-piperazine 3-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 4-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile 3-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile 4-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile 3-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 3-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 4-(5-{4-[2-(3-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine 4-(5-{4-[2-(4-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile. 5-(4-(3-phenylpropyl)piperazin-1-yl)-3-(p-tolyl)-1,2,4-thiadiazole 5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(3-fluorophenyl)-1,2,4-thiadiazole or 3-(3,4-difluorophenyl)-5-(4-(3-(trifluoromethyl)phenethyl)piperazin-1-yl)-1,2,4-thiadiazole.

One further embodiment of the invention are compounds of formula IA, wherein at least one of C 1 or C 2 is pyridine-2-yl, pyridine-3-yl or pyridine-4-yl, for example the following compounds
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(6-Methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 4-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 4-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 3-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine 1-(2-Methyl-benzyl)-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine. 3-(4-chloropyridin-2-yl)-5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-1,2,4-thiadiazole 3-(4-chloropyridin-2-yl)-5-(4-(3-(trifluoromethyl)phenethyl)piperazin-1-yl)-1,2,4-thiadiazole 3-(5-chloropyridin-3-yl)-5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-1,2,4-thiadiazole 3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole 5-(4-(4-chlorophenethyl)piperazin-1-yl)-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole 3-(2-chloropyridin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole 3-(2-methylpyridin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole or 5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(2-methylpyridin-4-yl)-1,2,4-thiadiazole.

One further embodiment of the invention are compounds of formula IA, wherein C 2 is cycloalkyl, for example the following compounds
1-(2-Cyclohexyl-ethyl)-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 1-(2-Cyclohexyl-ethyl)-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine 3-(4-chlorophenyl)-5-(4-(2-cyclohexylethyl)piperazin-1-yl)-1,2,4-thiadiazole or 3-(3-chlorophenyl)-5-(4-(2-cyclohexylethyl)piperazin-1-yl)-1,2,4-thiadiazole.

One further embodiment of the invention are compounds of formula IA, wherein C 2 is piperidin-lyl, for example the following compound
3-(5-chloropyridin-3-yl)-5-(4-(2-(piperidin-1-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole.

One further embodiment of the invention are compounds of formula IA, wherein C 2 is tetrahydro-2H-pyran-4-yl, for example the following compounds
3-(3,4-difluorophenyl)-5-(4-(2-(tetrahydro-2H-pyran-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole 3-(3-chlorophenyl)-5-(4-(2-(tetrahydro-2H-pyran-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole 3-(5-chloropyridin-3-yl)-5-(4-(2-(tetrahydro-2H-pyran-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole or 3-(4-chlorophenyl)-5-(4-(2-(tetrahydro-2H-pyran-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole.

One further embodiment of the invention are compounds of formula IA, wherein C 1 is pyridazin-4-yl, for example the following compounds
3-(6-methylpyridazin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole 5-(4-(4-fluorophenethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-1,2,4-thiadiazole 5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-1,2,4-thiadiazole 5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-1,2,4-thiadiazole or 5-(4-(4-methoxyphenethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-1,2,4-thiadiazole.

One further embodiment of the invention are compounds of formula IA, wherein C 1 is pyrimidin-5-yl, for example the following compounds
3-(2-methylpyrimidin-5-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole 5-(4-(4-methoxyphenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-1,2,4-thiadiazole 5-(4-(4-chlorophenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-1,2,4-thiadiazole 5-(4-(4-fluorophenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-1,2,4-thiadiazole 5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-1,2,4-thiadiazole or 5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-1,2,4-thiadiazole.

One embodiment of the invention are compounds of formula I, wherein A 1 and A 2 are both phenyl, for example the following compounds
1-(2,4-Dichloro-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-Phenethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-[2-(3,4-Dichloro-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine; 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(3-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-m-tolyl-ethyl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-p-tolyl-ethyl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(2-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(3-methoxy-phenyl)-propyl]-piperazine; 1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine; 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(2-methoxy-phenyl)-propyl]-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-ethoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-isopropoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(4-methoxy-phenyl)-propyl]-piperazine; 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanone; 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanol; 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine 1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-allyl]-piperazine 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanone; 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanol; 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanone; 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanol; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(3-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[1-(4-Chloro-phenyl)-cyclopropylmethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-difluoromethoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-difluoromethoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-isopropoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-propyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-1-methyl-ethyl]-piperazine; 4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-4-methoxy-phenyl)-ethyl]-piperazine; 3-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 4-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile; 3-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile; 4-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 3-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 4-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 3-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 4-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile; 3-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine; 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; 3-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 4-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine; 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine; 4-(5-{4-[2-(3-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine; or 4-(5-{4-[2-(4-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile.

One further embodiment of the invention are compounds of formula I, wherein at least one of A 1 or A 2 is pyridine-2-yl, pyridine-3-yl or pyridine-4-yl, for example the following compounds: 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine; 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine; 1 [3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine; 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine; 1-[3-(6-Methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine; 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine; 4-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 3-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 4-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 3-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile; 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine; 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine; 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine; 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine; 1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine; 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine; 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine; 1-(2-Methyl-benzyl)-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine; 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine; or 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine.
One further embodiment of the invention are compounds of formula I, wherein one of A 1 or A 2 is benzo[1,3]dioxol, for example the following compound: 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine.
One further embodiment of the invention are compounds of formula I, wherein at least one of A 1 or A 2 is thiophen-2-yl, for example the following compounds: 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine or 1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine.
One further embodiment of the invention are compounds of formula I, wherein at least one of A 1 or A 2 are pyrazine-2-yl, for example the following compounds: 2-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-pyrazine; or 2-(5-{4-[2-(3-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-pyrazine.
One further embodiment of the invention are compounds of formula I, wherein A 2 is cycloalkyl, for example the following compounds: 1-(2-Cyclohexyl-ethyl)-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine; or 1-(2-Cyclohexyl-ethyl)-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine.
The present compounds of formula IA or I, and their pharmaceutically acceptable salts can be prepared by methods known in the art, for example, by processes described below, which process comprises
coupling a compound of formula

with a compound of formula


to give a compound of formula


wherein PG is hydrogen or a protecting group such as tert-butyloxycarbonyl (BOC), 9-fluorenylmethyloxycarbonyl (FMOC) and the like, and hal is halogen such as chloro, bromo, fluoro, or iodo, wherein the definitions are as described above, or if desired, converting the compounds obtained into pharmaceutically acceptable acid addition salts. In an embodiment, A 1 has the same meaning as defined for C 1 , and A 2 has the same meaning as defined for C 2 .

General Experimental Part
The preparation of compounds of formula IA or I of the present invention may be carried out in sequential or convergent synthetic routes. Syntheses of the compounds of the invention are shown in the following schemes. The skills required for carrying out the reactions and purifications of the resulting products are known to those skilled in the art. The substituents and indices used in the following description of the processes have the significance given herein before unless indicated to the contrary.
In more detail, the compounds of formula IA or I can be manufactured by the methods given below, by the methods given in the examples or by analogous methods. Appropriate reaction conditions for the individual reaction steps are known to a person skilled in the art. Also, for reaction conditions described in literature affecting the described reactions see for example: Comprehensive Organic Transformations: A Guide to Functional Group Preparations, 2 nd Edition , Richard C. Larock. John Wiley & Sons, New York, N.Y. 1999). We find it convenient to carry out the reactions in the presence or absence of a solvent. There is no particular restriction on the nature of the solvent to be employed, provided that it has no adverse effect on the reaction or the reagents involved and that it can dissolve the reagents, at least to some extent. The described reactions can take place over a wide range of temperatures, and the precise reaction temperature is not critical to the invention. It is convenient to carry out the described reactions in a temperature range between −78° C. to reflux. The time required for the reaction may also vary widely, depending on many factors, notably the reaction temperature and the nature of the reagents. However, a period of from 0.5 h to several days will usually suffice to yield the described intermediates and compounds. The reaction sequence is not limited to the one displayed in the schemes, however, depending on the starting materials and their respective reactivity the sequence of reaction steps can be freely altered. Starting materials are either commercially available or can be prepared by methods analogous to the methods given below, by methods described in references cited in the description or in the examples, or by methods known in the art.

In an embodiment, A 1 has the same meaning as defined for C 1 , and A 2 has the same meaning as defined for C 2 .

a) Amidines II are either commercially available or can be synthesized according to methods known in the art. These amidine derivatives II are conveniently reacted with perchloromethyl mercaptan with a base (NEt 3 , DIPEA and the like) to afford chloro-thiadiazole derivatives III.

b) Chloro-thiadiazole derivatives III are conveniently reacted with either substituted piperazine derivatives to directly access final thiadiazole derivatives I or alternatively III is reacted with a protected piperazine (PG=Boc, and the like) to afford thiadiazole derivatives IV.

c) Deprotection of IV is done under suitable conditions, in case of PG=Boc under acidic conditions, to yield the free piperazine derivatives which are conveniently reacted with suitable electrophiles to access final thiadiazole derivatives I


d) 3-Bromo-5-chloro-1,2,4-thiadiazole and 3,5-dichloro-1,2,4-thiadiazole V are commercially available and can conveniently be reacted with protected (PG=Boc and the like) or substituted piperazines to yield thiadiazole derivatives VI or IX.

e) Thiadiazole derivatives VI or IX are conveniently reacted under Palladium catalysis with suitable boronic acids or esters to yield in case of IX the final derivatives I or in case of VI the protected thiadiazole derivatives VII.

f) Deprotection of VII is done under suitable conditions, in case of PG=Boc under acidic conditions, to yield the free piperazine derivatives which are conveniently reacted with suitable electrophiles to access final thiadiazole derivatives I.

EXPERIMENTAL PART
Abbreviations


DCM=dichloromethane;
DAST=dimethylaminosulfur trifluoride;
DIPEA=N,N-diisopropylethylamine;
DME=dimethoxyethane;
EtOH=ethanol;
EtOAc=ethyl acetate;
HPLC=high pressure liquid chromatography;
MeCN=Acetonitrile;
MeOH=methanol;
RT=room temperature;
THF=Tetrahydrofuran


Exemplary compounds of the present invention are listed in table II.






TABLE 2



Example
Chemical name








2
1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-


piperazine

3
1-(2,4-Dichloro-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine

4
1-Phenethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine

5
1-[2-(3,4-Dichloro-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-


piperazine

6
1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine

12
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-


piperazine

13
1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-


piperazine

14
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-


phenyl)-ethyl]-piperazine

15
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

16
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-


piperazine

17
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

18
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

19
1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-


piperazine

20
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-


yl)-piperazine

21
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-phenyl)-


ethyl]-piperazine

22
1-[2-(3-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-


5-yl]-piperazine

23
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-m-tolyl-ethyl)-


piperazine

24
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-


ethyl]-piperazine

25
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-


5-yl]-piperazine

26
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-p-tolyl-ethyl)-


piperazine

27
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


phenyl)-ethyl]-piperazine

28
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-fluoro-phenyl)-


ethyl]-piperazine

29
1-[2-(2-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-


5-yl]-piperazine

30
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

31
1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-


phenyl)-ethyl]-piperazine

32
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(3-methoxy-


phenyl)-propyl]-piperazine

33
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-


yl)-piperazine

34
1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-


phenyl)-ethyl]-piperazine

35
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

36
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

37
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

38
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-


trifluoromethoxy-phenyl)-ethyl]-piperazine

39
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(2-methoxy-


phenyl)-propyl]-piperazine

40
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

41
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

42
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

43
1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-


yl)-piperazine

44
1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-


yl)-piperazine

45
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

46
1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

47
1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

48
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-


phenyl)-ethyl]-piperazine

49
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

50
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-ethoxy-phenyl)-


ethyl]-piperazine

51
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-isopropoxy-


phenyl)-ethyl]-piperazine

52
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(4-methoxy-


phenyl)-propyl]-piperazine

53
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-


methoxy-phenyl)-ethanone

54
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-


methoxy-phenyl)-ethanol

55
1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-


methoxy-phenyl)-ethyl]-piperazine

56
1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-


methoxy-phenyl)-ethyl]-piperazine

57
1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-


phenyl)-ethyl]-piperazine

58
1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

59
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-allyl]-piperazine

60
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-


methoxy-phenyl)-ethanone

61
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-


methoxy-phenyl)-ethanol

62
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-


fluoro-phenyl)-ethanone

63
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-


fluoro-phenyl)-ethanol

64
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(4-


methoxy-phenyl)-ethyl]-piperazine

65
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(3-


methoxy-phenyl)-ethyl]-piperazine

66
1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-


methoxy-phenyl)-ethyl]-piperazine

67
1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-


methoxy-phenyl)-ethyl]-piperazine

68
1-[1-(4-Chloro-phenyl)-cyclopropylmethyl]-4-[3-(4-chloro-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

69
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-


difluoromethoxy-phenyl)-ethyl]-piperazine

70
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-


difluoromethoxy-phenyl)-ethyl]-piperazine

71
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-isopropoxy-


phenyl)-ethyl]-piperazine

72
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-propyl]-piperazine

73
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-1-methyl-ethyl]-piperazine

75
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


pyridin-4-yl)-ethyl]-piperazine

76
2-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-


3-yl)-pyrazine

77
2-(5-{4-[2-(3-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-


3-yl)-pyrazine

78
4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-


3-yl)-benzonitrile

79
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-


pyridin-3-yl)-ethyl]-piperazine

80
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-4-


methoxy-phenyl)-ethyl]-piperazine

81
3-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-


3-yl)-benzonitrile

82
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine

83
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine

84
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

85
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-


ethyl]-piperazine

86
1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-


5-yl]-piperazine

87
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-chloro-phenyl)-[1,2,4]thiadiazol-


5-yl]-piperazine

88
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-


5-yl]-piperazine

89
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


pyridin-4-yl)-ethyl]-piperazine

90
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


pyridin-4-yl)-ethyl]-piperazine

91
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

92
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-


piperazine

93
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-


pyridin-3-yl)-ethyl]-piperazine

94
1-[3-(6-Methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-


piperazine

95
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

96
1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

97
1-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

98
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

99
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-


piperazine

100
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-


3-yl)-ethyl]-piperazine

101
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-


piperazine

102
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

103
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-


phenyl)-ethyl]-piperazine

104
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

105
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-


pyridin-3-yl)-ethyl]-piperazine

106
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


pyridin-4-yl)-ethyl]-piperazine

107
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-


piperazine

108
4-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile

109
3-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile

110
4-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-


yl)-benzonitrile

111
3-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-


yl)-benzonitrile

112
4-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-


yl)-benzonitrile

113
3-(5-{4-[2-(4-Chloro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-


yl)-benzonitrile

114
4-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

115
3-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

116
4-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

117
3-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

118
4-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-


benzonitrile

119
3-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-


benzonitrile

120
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-


piperazine

121
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-


piperazine

122
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-


phenyl)-ethyl]-piperazine

123
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-pyridin-2-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

124
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-2-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

125
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

126
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-


phenyl)-ethyl]-piperazine

127
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


pyridin-4-yl)-ethyl]-piperazine

128
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-


benzyl)-piperazine

129
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-


benzyl)-piperazine

130
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-


piperazine

131
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-


phenyl)-ethyl]-piperazine

132
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

133
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-


pyridin-4-yl)-ethyl]-piperazine

134
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-


phenyl)-ethyl]-piperazine

135
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-


phenyl)-ethyl]-piperazine

136
1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-


[1,2,4]thiadiazol-5-yl]-piperazine

137
3-(5-(4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

138
4-(5-(4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

139
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-


phenyl)-ethyl]-piperazine

140
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-


phenyl)-ethyl]-piperazine

141
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-


phenyl)-ethyl]-piperazine

142
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-


phenyl)-ethyl]-piperazine

143
4-(5-{4-[2-(3-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

144
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-


phenyl)-ethyl]-piperazine

145
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-


phenyl)-ethyl]-piperazine

146
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-


trifluoromethyl-phenyl)-ethyl]-piperazine

147
4-(5-(4-[2-(4-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-


[1,2,4]thiadiazol-3-yl)-benzonitrile

148
1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-


[1,2,4]thiadiazol-5-yl]-piperazine

149
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-


trifluoromethyl-phenyl)-ethyl]-piperazine

150
1-(2-Methyl-benzyl)-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-


yl]-piperazine

151
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-


benzyl)-piperazine

152
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-


trifluoromethyl-phenyl)-ethyl]-piperazine

153
1-(2-Cyclohexyl-ethyl)-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-


yl]-piperazine

154
1-(2-Cyclohexyl-ethyl)-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-


piperazine

155
5-(4-(3-phenylpropyl)piperazin-1-yl)-3-(p-tolyl)-1,2,4-thiadiazole

156
5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(3-fluorophenyl)-1,2,4-


thiadiazole

157
3-(4-chloropyridin-2-yl)-5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-


1,2,4-thiadiazole

158
3-(3,4-difluorophenyl)-5-(4-(3-(trifluoromethyl)phenethyl)piperazin-1-


yl)-1,2,4-thiadiazole

159
3-(4-chloropyridin-2-yl)-5-(4-(3-(trifluoromethyl)phenethyl)piperazin-


1-yl)-1,2,4-thiadiazole

160
3-(5-chloropyridin-3-yl)-5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-


1,2,4-thiadiazole

161
3-(4-chlorophenyl)-5-(4-(2-cyclohexylethyl)piperazin-1-yl)-1,2,4-


thiadiazole

162
3-(3-chlorophenyl)-5-(4-(2-cyclohexylethyl)piperazin-1-yl)-1,2,4-


thiadiazole

163
3-(5-chloropyridin-3-yl)-5-(4-(2-(piperidin-1-yl)ethyl)piperazin-1-yl)-


1,2,4-thiadiazole

164
3-(3,4-difluorophenyl)-5-(4-(2-(tetrahydro-2H-pyran-4-


yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole

165
3-(3-chlorophenyl)-5-(4-(2-(tetrahydro-2H-pyran-4-yl)ethyl)piperazin-


1-yl)-1,2,4-thiadiazole

166
3-(5-chloropyridin-3-yl)-5-(4-(2-(tetrahydro-2H-pyran-4-


yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole

167
3-(4-chlorophenyl)-5-(4-(2-(tetrahydro-2H-pyran-4-yl)ethyl)piperazin-


1-yl)-1,2,4-thiadiazole

168
3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-


yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole

169
5-(4-(4-chlorophenethyl)piperazin-1-yl)-3-(2-chloropyridin-4-yl)-1,2,4-


thiadiazole

170
3-(2-chloropyridin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole

171
3-(2-methylpyridin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole

172
5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(2-


methylpyridin-4-yl)-1,2,4-thiadiazole

173
3-(6-methylpyridazin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-


thiadiazole

174
5-(4-(4-fluorophenethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-


1,2,4-thiadiazole

175
5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-


1,2,4-thiadiazole

176
5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(6-


methylpyridazin-4-yl)-1,2,4-thiadiazole

177
5-(4-(4-methoxyphenethyl)piperazin-1-yl)-3-(6-methylpyridazin-4-yl)-


1,2,4-thiadiazole

178
3-(2-methylpyrimidin-5-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-


thiadiazole

179
5-(4-(4-methoxyphenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-


1,2,4-thiadiazole

180
5-(4-(4-chlorophenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-


1,2,4-thiadiazole

181
5-(4-(4-fluorophenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-


1,2,4-thiadiazole

182
5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(2-methylpyrimidin-5-yl)-


1,2,4-thiadiazole

183
5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(2-


methylpyrimidin-5-yl)-1,2,4-thiadiazole










































































































































































































































































































































































EXPERIMENTAL PART
Example 2
1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









a) 5-Chloro-3-p-tolyl-1,2,4-thiadiazole
A mixture of 4-methylbenzimidamide hydrochloride (1.55 g, 9.08 mmol) and Et 3 N (4.6 g, 6.33 ml, 45.4 mmol) in DCM (30 mL) was cooled with a NaCl/ice-bath to −10° C. Perchloromethyl mercaptan (1.86 g, 1.09 ml, 9.99 mmol) in DCM (10 mL) was added during 40 min. The resulting yellow suspension was stirred for 20 min at 0° C. and 2 h at RT. Water (40 mL) and aq. 2N NaOH (10 mL) was added. The organic layer was separated and extracted with brine (50 mL). The aqueous layers were extracted with DCM (2×40 mL). The combined organic layers were dried over Na 2 SO 4 , filtered off and concentrated in vacuo. The residue was purified by silica chromatography (Flash 50 g Si-cartridge using AcOEt: Heptane 1:19 to 1:9.) to yield 5-chloro-3-p-tolyl-1,2,4-thiadiazole (1.63 g, 7.74 mmol, 85% yield) as light yellow solid.
b) 1-(benzo[d][1,3]dioxol-5-ylmethyl)piperazine
In a 5 mL microwave vial, 5-chloro-3-p-tolyl-1,2,4-thiadiazole (75.0 μmol), 1-(benzo[d][1,3]dioxol-5-ylmethyl)piperazine (300 μmol) and DIPEA (750 μmol) in 0.6 mL N-Methyl-2-pyrrolidinone was heated in the microwave at 165° C. for 12 min. The resulting reaction mixture solution was purified by preparative HPLC on reversed phase eluting with a gradient formed from MeCN, water and NEt 3 to yield after evaporation of the product containing fractions of the title compound as light brown solid. MS (m/e): 395.2 (MH + ).
Example 3
1-(2,4-Dichloro-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-p-tolyl-1,2,4-thiadiazole and 1-(2,4-dichlorobenzyl)piperazine as light brown solid. MS (m/e): 419.2 (MH + ).
Example 4
1-Phenethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-p-tolyl-1,2,4-thiadiazole and 1-phenethylpiperazine as light brown solid. MS (m/e): 365.3 (MH + ).
Example 5
1-[2-(3,4-Dichloro-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-p-tolyl-1,2,4-thiadiazole and 1-(3,4-dichlorophenethyl)piperazine as brown solid. MS (m/e): 433.3 (MH + ).
Example 6
1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









a) 1-(3-p-Tolyl-[1,2,4]thiadiazol-5-yl)-piperazine
A mixture of 5-chloro-3-p-tolyl-1,2,4-thiadiazole (900 mg, 4.27 mmol) and piperazine (1.84 g, 21.4 mmol) in 25 mL EtOH were heated to reflux and stirred for 1 h at this temperature. The resulting yellow solution was cooled to room temperature and concentrated in vacuo. The residue was purified by flash column chromatography on silica eluting with a gradient formed from DCM, MeOH and NEt 3 to yield after evaporation of the product containing fractions 1.1 g (99%) of the title compound as light yellow solid. MS (m/e): 261.3 (MH + ).
b) 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine
A mixture of 5-(piperazin-1-yl)-3-p-tolyl-1,2,4-thiadiazole (17.3 mg, 66.4 μmol), 1-(chloromethyl)-2-methylbenzene (14.0 mg, 99.7 μmol) and DIPEA (42.9 mg, 58.0 μl) in 0.8 mL N-Methyl-2-pyrrolidinone was heated in the microwave oven 165° C. for 12.5 min. The resulting reaction mixture solution was purified by preparative HPLC on reversed phase eluting with a gradient formed from MeCN, water and NEt 3 to yield after evaporation of the product containing fractions 17.5 mg (72%) of the title compound as yellow viscous oil. MS (m/e): 365.3 (MH + ).
Example 12
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









a) 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-(3-p-Tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6, step a) the title compound was prepared from 5-chloro-3-(4-chlorophenyl)-1,2,4-thiadiazole and piperazine as light yellow solid. MS (m/e): 281.2 (MH + ).
b) 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(chloromethyl)-2-methylbenzene as off-white foam. MS (m/e): 385.2 (MH + ).
Example 13
1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









a) 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-(3-p-Tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6, step a) the title compound was prepared from 5-chloro-3-(3-methoxyphenyl)-1,2,4-thiadiazole and piperazine as yellow solid. MS (m/e): 277.2 (MH + ).
b) 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(chloromethyl)-2-methylbenzene as light yellow viscous oil. MS (m/e): 381.4 (MH + ).
Example 14
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-3-methoxybenzene as light yellow foam. MS (m/e): 415.2 (MH + ).
Example 15
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromo ethyl)-3-methoxybenzene as light brown viscous oil. MS (m/e): 411.3 (MH + ).
Example 16
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 5-(piperazin-1-yl)-3-(p-tolyl)-1,2,4-thiadiazole and 1-(2-bromoethyl)-3-methoxybenzene as light yellow foam. MS (m/e): 395.2 (MH + ).
Example 17
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-methoxybenzene as light yellow foam. MS (m/e): 415.2 (MH + ).
Example 18
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(3-methoxy-phenyl)[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-methoxybenzene as light yellow foam. MS (m/e): 411.3 (MH + ).
Example 19
1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 5-(piperazin-1-yl)-3-(p-tolyl)-1,2,4-thiadiazole and 1-(2-bromoethyl)-4-methoxybenzene as off-white foam. MS (m/e): 395.2 (MH + ).
Example 20
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine









a) 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine
A mixture of isonicotinimidamide hydrochloride (1.0 g, 6.35 mmol) and NEt 3 (3.21 g, 4.42 mL, 31.7 mmol) in 50 mL DCM was cooled to −5 and −10° C. Perchloromethyl mercaptan (1.3 g, 763 μl, 6.98 mmol) in 10 mL DCM was added drop wise over 1 h. The mixture was warmed to 0° C. over 30 min and stirred for 2 h. Water (50 mL) and 2M NaOH (10 mL) was added. The suspension was filtrated. The organic layer was extracted with DCM and washed with brine (50 mL) and the aqueous layer was extracted with DCM (50 mL). The organic layers were combined, dried over Na 2 SO 4 and filtered off. The crude product was concentrated under vacuum and the residue dissolved in DCM, taken up on Isolute® and purified by column chromatography on silica eluting with a gradient formed from heptane and EtOAc to yield after evaporation of the product containing fraction 0.43 g (34%) of the title compound as a brown solid. MS (m/e): 198.1 (MH + ).
b) 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine
A mixture of 5-chloro-3-(pyridin-4-yl)-1,2,4-thiadiazole (42 mg, 213 μmol), 1-(3-methoxyphenethyl)piperazine dihydrochloride (62.3 mg, 213 μmol) and DIPEA (137 mg, 186 μl, 1.06 mmol) in 10 mL EtOH was stirred for 2.5 h at RT the mixture was filtered, washed with EtOH and dried in vacuo at 50° C. for 2 hours to yield 12.6 mg (15%) of the title compounds as orange solid. MS (m/e): 382.2 (MH + ).
Example 21
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-3-fluorobenzene as off-white solid. MS (m/e): 403.3 (MH + ).
Example 22
1-[2-(3-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-3-chlorobenzene as light yellow solid. MS (m/e): 419.2 (MH + ).
Example 23
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-m-tolyl-ethyl)-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-3-methylbenzene as light yellow solid. MS (m/e): 399.2 (MH + ).
Example 24
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-fluorobenzene as light yellow solid. MS (m/e): 403.3 (MH + ).
Example 25
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-chlorobenzene as light yellow solid. MS (m/e): 419.1 (MH + ).
Example 26
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-p-tolyl-ethyl)-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-methylbenzene as light yellow solid. MS (m/e): 399.1 (MH + ).
Example 27
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-2-methoxybenzene as light yellow solid. MS (m/e): 415.2 (MH + ).
Example 28
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-2-fluorobenzene as light yellow solid. MS (m/e): 403.2 (MH + ).
Example 29
1-[2-(2-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-2-chlorobenzene as light yellow solid. MS (m/e): 419.1 (MH + ).
Example 30
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









a) 5-(5-Chloro[1,2,4]thiadiazol-3-yl)-2-trifluoromethyl-pyridine
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 6-(trifluoromethyl) nicotinimidamide hydrochloride and perchloromethyl mecaptan as light brown solid. MS (m/e): 266.0 (MH + ).
b) 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20, step b) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-trifluoromethyl-pyridine and 1-(3-methoxyphenethyl)piperazine dihydrochloride as white solid. MS (m/e): 350.3 (MH + ).
Example 31
1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









a) 5-Chloro-3-(3,5-dichloro-phenyl)-[1,2,4]thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 3,5-dichlorobenzimidamide hydrochloride and perchloromethyl mecaptan as off-white solid. MS (m/e): 265.9 (MH + ).
b) 1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20, step b) the title compound was prepared from 5-Chloro-3-(3,5-dichloro-phenyl)-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 449.1 (MH + ).
Example 32
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(3-methoxy-phenyl)-propyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(3-bromopropyl)-3-methoxybenzene as light yellow solid. MS (m/e): 429.2 (MH + ).
Example 33
1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine









a) 5-Chloro-3-thiophen-2-yl-[1,2,4]thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from thiophene-2-carboximidamide hydrochloride and perchloromethyl mecaptan as yellow oil. MS (m/e): 202 (MH + ).
b) 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20, step b) the title compound was prepared from 5-Chloro-3-thiophen-2-yl-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl)piperazine dihydrochloride as yellow oil. MS (m/e): 387.2 (MH + ).
Example 34
1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 5-chloro-3-(4-fluorophenyl)-1,2,4-thiadiazole and 1-(3-methoxyphenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 399.2 (MH + ).
Example 35
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









a) 5-Chloro-3-(2-methoxy-phenyl)-[1,2,4]thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 2-methoxybenzimidamide hydrochloride and perchloromethyl mecaptan as yellow oil. MS (m/e): 227.1 (MH + ).
b) 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20, step b) the title compound was prepared from 5-Chloro-3-(2-methoxy-phenyl)-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl)piperazine dihydrochloride as yellow oil. MS (m/e): 411.3 (MH + ).
Example 36
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









a) 5-Chloro-3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 4-(trifluoromethoxy)benzimidamide hydrochloride and perchloromethyl mecaptan as light brown solid. MS (m/e): 280.0 (MH + ).
b) 1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20, step b) the title compound was prepared from 5-Chloro-3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl)piperazine dihydrochloride as light yellow solid. MS (m/e): 465.3 (MH + ).
Example 37
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 5-Chloro-3-(4-trifluoromethoxy-phenyl)-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 465.3 (MH + ).
Example 38
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromo ethyl)-3-(trifluoromethoxy)benzene as off-white solid. MS (m/e): 469.2 (MH + ).
Example 39
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(2-methoxy-phenyl)-propyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(3-bromopropyl)-2-methoxybenzene as off-white solid. MS (m/e): 429.2 (MH + ).
Example 40
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(4-methoxyphenyl)-1,2,4-thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 411.2 (MH + ).
Example 41
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 415.3 (MH + ).
Example 42
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-trifluoromethyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-trifluoromethyl-pyridine and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 450.2 (MH + ).
Example 43
1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 382.3 (MH + ).
Example 44
1-[2-(4-Methoxy-phenyl)-ethyl]-4-(3-thiophen-2-yl-[1,2,4]thiadiazol-5-yl)-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-thiophen-2-yl-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 387.2 (MH + ).
Example 45
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(2-methoxy-phenyl)[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(2-methoxy-phenyl)-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as yellow oil. MS (m/e): 411.2 (MH + ).
Example 46
1-[3-(3,5-Dichloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(3,5-dichloro-phenyl)-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 449.2 (MH + ).
Example 47
1-[3-(4-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(4-fluorophenyl)-1,2,4-thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 399.2 (MH + ).
Example 48
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and 1-(3-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 415.3 (MH + ).
Example 49
1-[2-(3-Methoxy-phenyl)-ethyl]-4-[3-(4-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(4-methoxyphenyl)-1,2,4-thiadiazole and 1-(3-methoxyphenethyl) piperazine dihydrochloride as white solid. MS (m/e): 411.3 (MH + ).
Example 50
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-ethoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-ethoxybenzene as off-white solid. MS (m/e): 429.3 (MH + ).
Example 51
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-isopropoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromo ethyl)-3-isopropoxybenzene as light yellow solid. MS (m/e): 443.2 (MH + ).
Example 52
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[3-(4-methoxy-phenyl)-propyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(3-bromopropyl)-4-methoxybenzene as off-white solid. MS (m/e): 429.3 (MH + ).
Example 53
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanone









A mixture of 3-(4-chlorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole (539 mg, 1.92 mmol), 2-bromo-4′-methoxyacetophenone (440 mg, 1.92 mmol) and DIPEA (744 mg, 1.01 ml, 5.76 mmol) in 10 mL EtOH was stirred for 2 h at RT. Another portion 2-bromo-4′-methoxyacetophenone (220 mg, 960 μmol) was added and stirring continued for 2 h. The reaction was filtered off and washed with MeOH (4×5 mL) and Et 2 O (2×5 mL). The filter cake was dried in vacuo at 50° C. to yield 526 mg (64%) of the title compound as white solid. MS (m/e): 429.2 (MH + ).
Example 54
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanol









A mixture of 2-(4-(3-(4-chlorophenyl)-1,2,4-thiadiazol-5-yl)piperazin-1-yl)-1-(4-methoxyphenyl)ethanone (75 mg, 175 μmol) and NaBH4 (10 mg, 264 μmol) in THF (5 mL) and MeOH (1 mL) was stirred at RT. Water (5 mL) and 10% aq.Na 2 CO 3 (5 mL) was added and stirred for 10 min. The mixture was extracted with EtOAc; the organic layers were washed with brine (20 mL), dried over Na 2 SO 4 , filtered off and concentrated in vacuo.
The residue was purified by column chromatography on silica eluting with EtOAc to yield after evaporation of the product containing fraction 70 mg (93%) of the title compound as white solid. MS (m/e): 431.2 (MH + ).
Example 55
1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









a) 5-Chloro-3-(4-chloro-2-fluoro-phenyl)-[1,2,4]thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 4-chloro-2-fluorobenzimidamide hydrochloride and perchloromethyl mecaptan as yellow solid. MS (m/e): 248.0 (MH + ).
b) 1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(4-chloro-2-fluoro-phenyl)-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl) piperazine dihydrochloride as yellow oil. MS (m/e): 433.2 (MH + ).
Example 56
1-[3-(4-Chloro-2-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(4-chloro-2-fluoro-phenyl)-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as light yellow oil. MS (m/e): 433.2 (MH + ).
Example 57
1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(2-chloro-phenyl)-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl) piperazine dihydrochloride as yellow oil. MS (m/e): 415.3 (MH + ).
Example 58
1-[3-(2-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(2-chloro-phenyl)-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as light yellow solid. MS (m/e): 415.3 (MH + ).
Example 59
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-allyl]-piperazine









A mixture of methyltriphenylphosphonium bromide/sodium amide (57.7 mg, 146 μmol) was combined with THF (5 mL) to give a yellow suspension and stirred for 1 h at RT. 2-(4-(3-(4-chlorophenyl)-1,2,4-thiadiazol-5-yl)piperazin-1-yl)-1-(4-methoxyphenyl)ethanone (50 mg, 117 μmol) dissolved in THF (3 mL) was added drop-wise via syringe over 5 min. The resulting orange suspension was stirred over night at RT. Water (10 mL) and EtOAc (10 mL) was added and stirred for 10 min. The aqueous layer was separated and extracted with EtOAc (1×10 mL). The organic layers were washed with brine (1×10 mL), dried over Na 2 SO 4 , filtered off and concentrated in vacuo. The residue was purified by column chromatography on silica eluting with a gradient formed from heptane and EtOAc to yield, after evaporation of the product containing fraction, 33 mg (66%) of the title compound as off-white solid. MS (m/e): 427.2 (MH + ).
Example 60
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanone









In analogy to the procedure described for the synthesis of 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanone (example 53) the title compound was prepared from 3-(4-chlorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 2-bromo-3′-methoxyacetophenone as off-white solid. MS (m/e): 429.2 (MH + ).
Example 61
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanol









In analogy to the procedure described for the synthesis of 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanol (Example 54) the title compounds was prepared from 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanone through reduction as white solid. MS (m/e): 431.3 (MH + ).
Example 62
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanone









In analogy to the procedure described for the synthesis of 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanone (example 53) the title compound was prepared from 3-(4-chlorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 2-bromo-3′-fluoroacetophenone as white solid. MS (m/e): 417.1 (MH + ).
Example 63
2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanol









In analogy to the procedure described for the synthesis of 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(4-methoxy-phenyl)-ethanol (Example 54) the title compound was prepared from 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-fluoro-phenyl)-ethanone through reduction as white solid. MS (m/e): 431.3 (MH + ).
Example 64
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(4-methoxy-phenyl)-ethyl]-piperazine









A mixture of 2-(4-(3-(4-chlorophenyl)-1,2,4-thiadiazol-5-yl)piperazin-1-yl)-1-(4-methoxyphenyl)ethanol (30 mg, 69.6 μmol) and DAST (22.4 mg, 18.4 μl, 139 μmol) in 2 mL DCM at 0-5° C. was warmed to RT and stirred for 2 h. 10% aq. Na 2 CO 3 -solution was added and stirred for 10 min. The organic layer was separated and concentrated in vacuo. The residue was purified by column chromatography on silica eluting with a gradient formed from heptane and EtOAc to yield, after evaporation of the product containing fraction, 24 mg (80%) of the title compound as light yellow solid. MS (m/e): 433.3 (MH + ).
Example 65
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(3-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-fluoro-2-(4-methoxy-phenyl)-ethyl]-piperazine (Example 64) the title compound was prepared from 2-{4-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazin-1-yl}-1-(3-methoxy-phenyl)-ethanol and DAST as light yellow solid. MS (m/e): 433.3 (MH + ).
Example 66
1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine









a) 5-Chloro-3-(4-fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 4-fluoro-2-methoxybenzimidamide hydrochloride and perchloromethyl mecaptan as yellow oil. MS (m/e): 245.0 (MH + ).
b) 1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-methoxy-phenyl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(4-fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazole and 1-(3-methoxyphenethyl) piperazine dihydrochloride as yellow oil. MS (m/e): 429.4 (MH + ).
Example 67
1-[3-(4-Fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-3-(4-fluoro-2-methoxy-phenyl)-[1,2,4]thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as yellow oil. MS (m/e): 429.3 (MH + ).
Example 68
1-[1-(4-Chloro-phenyl)-cyclopropylmethyl]-4-[3-(4-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(1-(bromomethyl)cyclopropyl)-4-chlorobenzene as white solid. MS (m/e): 455.1 (MH + ).
Example 69
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-difluoromethoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-3-(difluoromethoxy)benzene as yellow solid. MS (m/e): 451.1 (MH + ).
Example 70
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-difluoromethoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-(difluoromethoxy)benzene as off-white solid. MS (m/e): 451.0 (MH + ).
Example 71
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-isopropoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromo ethyl)-4-isopropoxybenzene as off-white solid. MS (m/e): 433.3 (MH + ).
Example 72
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-propyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(1-bromopropan-2-yl)-4-methoxybenzene as off-white solid. MS (m/e): 429.2 (MH + ).
Example 73
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-1-methyl-ethyl]-piperazine









A mixture of 3-(4-chlorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole (100 mg, 356 μmol), 4-methoxyphenylacetophenone (64.3 mg, 392 μmol) and titanium IV propoxide (152 mg, 158 μl, 534 μmol) in 2 mL THF was stirred for 3 h at RT. NaBH 4 (40.4 mg, 1.07 mmol) was added in three portions. MeOH (0.2 mL) was added and stirred over the weekend at RT. Water (5 mL), EtOAc (10 mL) and aq. 2N NaOH (3 mL) was added, stirred for 10 min and filtered over a dicalit-plug. The aqueous layer was separated and extracted once with EtOAc (20 mL). The organic layers were washed with brine (1×20 mL), dried over Na 2 SO 4 , filtered off and concentrated in vacuo. The residue was purified by column chromatography on silica eluting with a gradient formed from heptane and EtOAc and again with preparative HPLC to yield, after evaporation of the product containing fraction, 39 mg (25%) of the title compound as off-white solid. MS (m/e): 429.2 (MH + ).
Example 75
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine









a) 4-(2-Bromo-ethyl)-2-methoxy-pyridine
A mixture of 2-(2-methoxypyridin-4-yl)ethanol (commercially available) (700 mg, 4.57 mmol,), CBr 4 (2.27 g, 6.85 mmol) and triphenylphosphine (1.8 g, 6.85 mmol) in 75 mL toluene was stirred at RT for 64 h. The mixture was filtered over a silica-plug and washed with toluene. The filtrate concentrated under vacuum to yield the crude product. The residue was purified by column chromatography on silica eluting with a gradient formed from heptane and EtOAc to yield, after evaporation of the product containing fraction, 624 mg (63%) of the title compound as colourless liquid. MS (m/e): 216.2 (MH + ).
b) 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 4-(2-Bromo-ethyl)-2-methoxy-pyridine as off-white solid. MS (m/e): 416.2 (MH + ).
Example 76
2-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-pyrazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(pyrazin-2-yl)-1,2,4-thiadiazole and 1-(4-methoxyphenethyl) piperazine dihydrochloride as off-white solid. MS (m/e): 383.2 (MH + ).
Example 77
2-(5-{4-[2-(3-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-pyrazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(pyrazin-2-yl)-1,2,4-thiadiazole and 1-(3-methoxyphenethyl) piperazine dihydrochloride as purple viscous oil. MS (m/e): 383.2 (MH + ).
Example 78
4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









a) 1-(3-Chloro-[1,2,4]thiadiazol-5-yl)-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine
A mixture of 1-(4-methoxyphenethyl)piperazine dihydrochloride (1.04 g, 3.55 mmol), 3,5-dichloro-1,2,4-thiadiazole (500 mg, 3.23 mmol) and DIPEA (1.33 g, 1.8 ml, 10.3 mmol) in 23 mL EtOH was stirred for 1 h at RT. The reaction solution was concentrated in vacuo and the crude product was purified by column chromatography on silica eluting with a gradient formed from heptane and EtOAc to yield, after evaporation of the product containing fraction, 1.06 g (97%) of the title compound as white solid. MS (m/e): 339.2 (MH + ).
b) 4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile
A 5 ml micro wave vial was charged with 3-chloro-5-(4-(4-methoxyphenethyl)piperazin-1-yl)-1,2,4-thiadiazole (50 mg, 148 μmol) in 3 mL DME. 4-Cyanophenylboronic acid (26.0 mg, 177 μmol), Na 2 CO 3 (18.8 mg, 177 μmol), tetrakis(triphenylphosphine) palladium (0) (3.41 mg, 2.95 μmol) and water (1.5 mL) was added. The vial was capped and the mixture was heated in oil bath at 110° C. over night. 2 mL EtOAc were added and the aqueous part was separated. The organic layer was dried over Na 2 SO 4 , filtered off and concentrated in vacuo. The crude product was dissolved in MeCN (3 mL)/DIPEA (100 μL) and purified by preparative HPLC on reversed phase eluting with a gradient formed from MeCN, water and NEt 3 to yield, after evaporation of the product containing fractions, 13.6 mg (23%) of the title compound as white solid. MS (m/e): 406.3 (MH + ).
Example 79
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 5-(2-bromoethyl)-2-methoxypyridine as white solid. MS (m/e): 416.3 (MH + ).
Example 80
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-fluoro-4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 4-(2-bromo ethyl)-2-fluoro-1-methoxybenzene as white solid. MS (m/e): 433.2 (MH + ).
Example 81
3-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









a) 1-(3-Bromo-[1,2,4]thiadiazol-5-yl)-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-(3-Chloro-[1,2,4]thiadiazol-5-yl)-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine (example 78, step a) the title compound was prepared from 3-bromo-5-chloro-1,2,4-thiadiazole and 1-(4-methoxyphenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 383.2 (MH + ).
b) 3-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile
In analogy to the procedure described for the synthesis of 4-(5-{4-[2-(4-Methoxy-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile (example 78, step b) the title compound was prepared from 1-(3-Bromo-[1,2,4]thiadiazol-5-yl)-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine and 3-cyanophenylboronic acid under palladium catalysis as light yellow solid. MS (m/e): 406.3 (MH + ).
Example 82
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and 1-phenethylpiperazine dihydrochloride as off-white solid. MS (m/e): 385.1 (MH + ).
Example 83
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-fluorphenyl)-1,2,4-thiadiazole and 1-phenethylpiperazine dihydrochloride as off-white solid. MS (m/e): 369.1 (MH + ).
Example 84
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-fluorphenyl)-1,2,4-thiadiazole and 1-(4-methoxyphenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 399.2 (MH + ).
Example 85
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and 1-(4-fluorophenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 40.3.3 (MH + ).
Example 86
1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-fluorphenyl)-1,2,4-thiadiazole and 1-(4-fluorophenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 387.2 (MH + ).
Example 87
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and 1-(4-chlorophenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 419.1 (MH + ).
Example 88
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3-fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-fluorphenyl)-1,2,4-thiadiazole and 1-(4-chlorophenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 403.3 (MH + ).
Example 89
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride as off-white solid. MS (m/e): 416.2 (MH + ).
Example 90
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(3-fluorphenyl)-1,2,4-thiadiazole and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride as off-white solid. MS (m/e): 400.1 (MH + ).
Example 91
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









a) 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 5-chloronicotinimidamide hydrochloride and perchloromethyl mecaptan as light yellow solid. MS (m/e): 232.0 (MH + ).
b) 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-methoxyphenethyl)piperazine dihydrochloride (heating not mandatory) as white solid. MS (m/e): 416.3 (MH + ).
Example 92
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









a) 4-(3-Bromo-[1,2,4]thiadiazol-5-yl)-piperazine-1-carboxylic acid tert-butyl ester
In analogy to the procedure described for the synthesis of 1-(3-Bromo-[1,2,4]thiadiazol-5-yl)-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine (example 81, step a) the title compound was prepared from 3-bromo-5-chloro-1,2,4-thiadiazole and tert-butyl piperazine-1-carboxylate as white solid. MS (m/e): 351.2 (MH + ).
b) 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride
A mixture of tert-butyl 4-(3-bromo-1,2,4-thiadiazol-5-yl)piperazine-1-carboxylate (1 g, 2.86 mmol), 3-chlorophenylboronic acid (537 mg, 3.44 mmol), Na 2 CO 3 (364 mg, 3.44 mmol) and tetrakis(triphenylphosphine) palladium (0) (66.2 mg, 57.3 μmol) in 36 mL DME/12 mL water was heated to 100° C. over night. The mixture was extracted with EtOAc (80 mL)/water (80 mL). The organic layer was dried over Na 2 SO 4 , filtered off and concentrated in vacuo to give amber oil which was dissolved in 25 mL dioxane, 7.16 mL 4N HCl/dioxane was added and stirred over night at RO. Et 2 O was added and the mixture was filtered and washed with Et 2 O. The filter cake was dried in vacuo at 50° C. to yield 926 mg (90%) of the intermediate compound as light yellow solid. MS (m/e): 281.0 (MH + ).
c) 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 2-methylbenzyl chloride as colorless viscous oil. MS (m/e): 385.1 (MH + ).
Example 93
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 5-(2-bromoethyl)-2-methoxypyridine as off-white solid. MS (m/e): 416.2 (MH + ).
Example 94
1-[3-(6-Methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









a) 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 6-methylnicotinimidamide hydrochloride and perchloromethyl mecaptan as light brown solid. MS (m/e): 212.0 (MH + ).
b) 1-[3-(6-Methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine and 1-phenethylpiperazine dihydrochloride as off-white solid. MS (m/e): 366.2 (MH + ).
Example 95
1-[2-(4-Methoxy-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine and 1-(4-methoxyphenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 396.2 (MH + ).
Example 96
1-[2-(4-Fluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine and 1-(4-fluorophenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 384.2 (MH + ).
Example 97
1-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride as off-white solid. MS (m/e): 397.2 (MH + ).
Example 98
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine and 1-(4-chlorophenethyl)piperazine dihydrochloride as off-white solid. MS (m/e): 400.1 (MH + ).
Example 99
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









a) 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 5-chloro-3-(3-fluorophenyl)-1,2,4-thiadiazole and 1-BOC-piperazine with subsequent removal of the protecting group under acidic conditions as white solid. MS (m/e): 265.2 (MH + ).
b) 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 2-methylbenzyl chloride as colorless viscous oil. MS (m/e): 369.1 (MH + ).
Example 100
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 5-(2-bromoethyl)-2-methoxypyridine as light brown solid. MS (m/e): 400.1 (MH + ).
Example 101
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









a) 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride
In analogy to the procedure described for the synthesis of tert-butyl 4-(3-bromo-1,2,4-thiadiazol-5-yl)piperazine-1-carboxylate (example 92, step a) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 3,4-difluorophenylboronic acid with subsequent removal of the protecting group under acidic conditions as light yellow solid. MS (m/e): 283.1 (MH + ).
b) 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and (2-bromoethyl)benzene as off-white solid. MS (m/e): 387.2 (MH + ).
Example 102
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-methoxybenzene as off-white solid. MS (m/e): 417.3 (MH + ).
Example 103
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-fluorobenzene as off-white solid. MS (m/e): 405.3 (MH + ).
Example 104
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-chlorobenzene as off-white solid. MS (m/e): 421.2 (MH + ).
Example 105
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(6-methoxy-pyridin-3-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 5-(2-bromoethyl)-2-methoxypyridine as off-white solid. MS (m/e): 418.3 (MH + ).
Example 106
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 4-(2-bromoethyl)-2-methoxypyridine as off-white solid. MS (m/e): 418.2 (MH + ).
Example 107
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(chloromethyl)-2-methylbenzene as off-white solid. MS (m/e): 387.2 (MH + ).
Example 108
4-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile









a) 4-(5-Piperazin-1-yl-[1,2,4]thiadiazol-3-yl)-benzonitrile
In analogy to the procedure described for the synthesis of tert-butyl 4-(3-bromo-1,2,4-thiadiazol-5-yl)piperazine-1-carboxylate (example 92, step a) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 4-cyanophenylboronic acid with subsequent removal of the protecting group under acidic conditions as light yellow solid. MS (m/e): 272.1 (MH + ).
b) 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[4-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and (2-bromoethyl)benzene as off-white solid. MS (m/e): 376.3 (MH + ).
Example 109
3-[5-(4-Phenethyl-piperazin-1-yl)-[1,2,4]thiadiazol-3-yl]-benzonitrile









a) 3-(5-Piperazin-1-yl-[1,2,4]thiadiazol-3-yl)-benzonitrile
In analogy to the procedure described for the synthesis of tert-butyl 4-(3-bromo-1,2,4-thiadiazol-5-yl)piperazine-1-carboxylate (example 92, step a) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 3-cyanophenylboronic acid with subsequent removal of the protecting group under acidic conditions as light yellow solid. MS (m/e): 272.1 (MH + ).
b) 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[(3-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and (2-bromoethyl)benzene as light brown solid. MS (m/e): 376.3 (MH + ).
Example 110
4-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[4-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-fluorobenzene as off-white solid. MS (m/e): 394.1 (MH + ).
Example 111
3-(5-{4-[2-(4-Fluoro-phenyl)-ethyl]piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-fluorobenzene as light brown solid. MS (m/e): 394.1 (MH + ).
Example 112
4-(5-{4-[2-(4-Chloro-phenyl)-ethyl]piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[4-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-chlorobenzene as off-white solid. MS (m/e): 410.2 (MH + ).
Example 113
3-(5-{4-[2-(4-Chloro-phenyl)-ethyl]piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(2-bromoethyl)-4-chlorobenzene as light brown solid. MS (m/e): 410.2 (MH + ).
Example 114
4-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[4-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 5-(2-bromoethyl)-2-methoxypyridine as off-white solid. MS (m/e): 407.3 (MH + ).
Example 115
3-(5-{4-[2-(6-Methoxy-pyridin-3-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 5-(2-bromoethyl)-2-methoxypyridine as light brown solid. MS (m/e): 407.4 (MH + ).
Example 116
4-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[4-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 4-(2-bromoethyl)-2-methoxypyridine as off-white solid. MS (m/e): 407.3 (MH + ).
Example 117
3-(5-{4-[2-(2-Methoxy-pyridin-4-yl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 4-(2-bromoethyl)-2-methoxypyridine as light brown solid. MS (m/e): 407.4 (MH + ).
Example 118
4-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[4-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(chloromethyl)-2-methylbenzene as off-white solid. MS (m/e): 376.3 (MH + ).
Example 119
3-{5-[4-(2-Methyl-benzyl)-piperazin-1-yl]-[1,2,4]thiadiazol-3-yl}-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-cyano-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and 1-(chloromethyl)-2-methylbenzene as light brown solid. MS (m/e): 376.3 (MH + ).
Example 120
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









a) 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine
In analogy to the procedure described fort the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 4-chloropicolinimidamide hydrochloride and perchloromethyl mecaptan as brown solid. MS (m/e): 232.0 (MH + ).
b) 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-phenethylpiperazine dihydrochloride. MS (m/e): 386.2 (MH + ).
Example 121
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









a) 5-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (example 20, step a) the title compound was prepared from 5-chloropicolinimidamide hydrochloride and perchloromethyl mecaptan as brown solid. MS (m/e): 232.0 (MH + ).
b) 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-phenethylpiperazine dihydrochloride. MS (m/e): 386.2 (MH + ).
Example 122
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-fluorophenethyl)piperazine dihydrochloride. MS (m/e): 404.3 (MH + ).
Example 123
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(4-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-chlorophenethyl)piperazine dihydrochloride. MS (m/e): 420.1 (MH + ).
Example 124
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-chlorophenethyl)piperazine dihydrochloride. MS (m/e): 420.1 (MH + ).
Example 125
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-methoxyphenethyl)piperazine dihydrochloride. MS (m/e): 416.3 (MH + ).
Example 126
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-methoxy-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-methoxyphenethyl)piperazine dihydrochloride. MS (m/e): 416.3 (MH + ).
Example 127
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride. MS (m/e): 417.3 (MH + ).
Example 128
1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









a) 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-BOC-piperazine with subsequent removal of the protecting group under acidic conditions as white solid. MS (m/e): 265.2 (MH + ).
b) 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(chloromethyl)-2-methylbenzene. MS (m/e): 386.2 (MH + ).
Example 129
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









a) 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 5-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-BOC-piperazine with subsequent removal of the protecting group under acidic conditions as light brown solid. MS (m/e): 282.2 (MH + ).
b) 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(chloromethyl)-2-methylbenzene. MS (m/e): 386.2 (MH + ).
Example 130
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-phenethyl-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-phenethylpiperazine dihydrochloride as white solid. MS (m/e): 386.2 (MH + ).
Example 131
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-fluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-fluorophenethyl)piperazine dihydrochloride as white solid. MS (m/e): 404.3 (MH + ).
Example 132
1-[2-(4-Chloro-phenyl)-ethyl]-4-[3-(5-chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(4-chlorophenethyl)piperazine dihydrochloride as white solid. MS (m/e): 420.1 (MH + ).
Example 133
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(2-methoxy-pyridin-4-yl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride as viscous colorless oil. MS (m/e): 417.2 (MH + ).
Example 134
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 4-(2-bromo ethyl)-1,2-difluorobenzene. MS (m/e): 421.1 (MH + ).
Example 135
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 4-(2-bromoethyl)-1,2-difluorobenzene. MS (m/e): 421.1 (MH + ).
Example 136
1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(3,4-difluorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole dihydrochloride and 4-(2-bromoethyl)-1,2-difluorobenzene. MS (m/e): 423.2 (MH + ).
Example 137
3-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(5-(piperazin-1-yl)-1,2,4-thiadiazol-3-yl)benzonitrile and 4-(2-bromo ethyl)-1,2-difluorobenzene. MS (m/e): 412.2 (MH + ).
Example 138
4-(5-{4-[2-(3,4-Difluoro-phenyl)-ethyl]piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 4-(5-(piperazin-1-yl)-1,2,4-thiadiazol-3-yl)benzonitrile and 4-(2-bromoethyl)-1,2-difluorobenzene. MS (m/e): 412.2 (MH + ).
Example 139
1-[3-(5-Chloro-pyridin-2-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3,4-difluoro-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(5-chloropyridin-2-yl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 4-(2-bromoethyl)-1,2-difluorobenzene. MS (m/e): 422.1 (MH + ).
Example 140
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-3-(trifluoromethyl)benzene. MS (m/e): 453.1 (MH + ).
Example 141
1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydro chloride and 1-(2-bromoethyl)-3-(trifluoromethyl)benzene. MS (m/e): 437.2 (MH + ).
Example 142
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromo ethyl)-3-(trifluoromethyl)benzene. MS (m/e): 453.1 (MH + ).
Example 143
4-(5-{4-[2-(3-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(5-(piperazin-1-yl)-1,2,4-thiadiazol-3-yl)benzonitrile and 1-(2-bromoethyl)-3-(trifluoromethyl)benzene. MS (m/e): 444.3 (MH + ).
Example 144
1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(4-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-(trifluoromethyl)benzene. MS (m/e): 453.1 (MH + ).
Example 145
1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Chloro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine and 1-(2-bromoethyl)-4-(trifluoromethyl)benzene. MS (m/e): 453.1 (MH + ).
Example 146
1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(3,4-difluorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole dihydrochloride and 1-(2-bromoethyl)-4-(trifluoromethyl)benzene. MS (m/e): 455.2 (MH + ).
Example 147
4-(5-{4-[2-(4-Trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-[1,2,4]thiadiazol-3-yl)-benzonitrile









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(5-(piperazin-1-yl)-1,2,4-thiadiazol-3-yl)benzonitrile and 1-(2-bromoethyl)-4-(trifluoromethyl)benzene. MS (m/e): 444.3 (MH + ).
Example 148
1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









a) 1-[3-(6-Methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 5-(5-Chloro-[1,2,4]thiadiazol-3-yl)-2-methyl-pyridine and 1-BOC-piperazine with subsequent removal of the protecting group under acidic conditions as off-white solid. MS (m/e): 262.1 (MH + ).
b) 1-[2-(3,4-Difluoro-phenyl)-ethyl]-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(6-methylpyridin-3-yl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 4-(2-bromoethyl)-1,2-difluorobenzene. MS (m/e): 402.3 (MH + ).
Example 149
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine









a) 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine
In analogy to the procedure described for the synthesis of 1-[2-(3-Methoxy-phenyl)-ethyl]-4-(3-pyridin-4-yl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 20) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-BOC-piperazine with subsequent removal of the protecting group under acidic conditions as white solid. MS (m/e): 282.2 (MH + ).
b) 1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(3-trifluoromethyl-phenyl)-ethyl]-piperazine
In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(6-methylpyridin-3-yl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 1-(2-bromoethyl)-3-(trifluoromethyl)benzene. MS (m/e): 454.1 (MH + ).
Example 150
1-(2-Methyl-benzyl)-4-[3-(6-methyl-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(6-methylpyridin-3-yl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 1-(chloromethyl)-2-methylbenzene. MS (m/e): 366.2 (MH + ).
Example 151
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-(2-methyl-benzyl)-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(6-methylpyridin-3-yl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 1-(chloromethyl)-2-methylbenzene. MS (m/e): 386.2 (MH + ).
Example 152
1-[3-(5-Chloro-pyridin-3-yl)-[1,2,4]thiadiazol-5-yl]-4-[2-(4-trifluoromethyl-phenyl)-ethyl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(6-methylpyridin-3-yl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 1-(2-bromoethyl)-4-(trifluoromethyl)benzene. MS (m/e): 454.1 (MH + ).
Examples 153
1-(2-Cyclohexyl-ethyl)-4-[3-(3,4-difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(3,4-difluorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole dihydrochloride and (2-bromoethyl)cyclohexane. MS (m/e): 393.2 (MH + ).
Example 154
1-(2-Cyclohexyl-ethyl)-4-[3-(3-fluoro-phenyl)[1,2,4]thiadiazol-5-yl]-piperazine









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3-Fluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydrochloride and (2-bromoethyl)cyclohexane. MS (m/e): 375.3 (MH + ).
Example 155
5-(4-(3-phenylpropyl)piperazin-1-yl)-3-(p-tolyl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-(3-p-Tolyl-[1,2,4]thiadiazol-5-yl)-piperazine and (3-bromopropyl)benzene.
Example 156
5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-3-(3-fluorophenyl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 3-(3-fluorophenyl)-5-(piperazin-1-yl)-1,2,4-thiadiazole and 4-(2-bromoethyl)-1,2-difluorobenzene.
Example 157
3-(4-chloropyridin-2-yl)-5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 4-(2-bromoethyl)-1,2-difluorobenzene.
Example 158
3-(3,4-difluorophenyl)-5-(4-(3-(trifluoromethyl)phenethyl)piperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 1-[3-(3,4-Difluoro-phenyl)-[1,2,4]thiadiazol-5-yl]-piperazine dihydro chloride and 1-(2-bromoethyl)-3-(trifluoromethyl)benzene.
Example 159
3-(4-chloropyridin-2-yl)-5-(4-(3-(trifluoromethyl)phenethyl)piperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 4-Chloro-2-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 1-(2-bromoethyl)-3-(trifluoromethyl)benzene.
Example 160
3-(5-chloropyridin-3-yl)-5-(4-(3,4-difluorophenethyl)piperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 3-Chloro-5-(5-chloro-[1,2,4]thiadiazol-3-yl)-pyridine and 4-(2-bromoethyl)-1,2-difluorobenzene.
Example 161
3-(4-chlorophenyl)-5-(4-(2-cyclohexylethyl)piperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 5-chloro-3-(4-chlorophenyl)-1,2,4-thiadiazole and (2-bromoethyl)cyclohexane.
Example 162
3-(3-chlorophenyl)-5-(4-(2-cyclohexylethyl)piperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 1-(2-Methyl-benzyl)-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (example 6) the title compound was prepared from 5-chloro-3-(3-chlorophenyl)-1,2,4-thiadiazole and (2-bromoethyl)cyclohexane.
Example 168
3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole









a) 5-chloro-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole
In analogy to the procedure described for the synthesis of 4-(5-Chloro-[1,2,4]thiadiazol-3-yl)-pyridine (Example 20, step a) the title compound was prepared from 2-chloroisonicotinimidamide.
b) 3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole
In analogy to the procedure described for the synthesis of 1-Benzo[1,3]dioxol-5-ylmethyl-4-(3-p-tolyl-[1,2,4]thiadiazol-5-yl)-piperazine (Example 2) the title compound was prepared from 5-chloro-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride.
Example 169
5-(4-(4-chlorophenethyl)piperazin-1-yl)-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole (Example 168), the tile compound was prepared from 5-chloro-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole and 1-(2-bromoethyl)-4-chlorobenzene.
Example 170
3-(2-chloropyridin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole (Example 168), the tile compound was prepared from 5-chloro-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole and (2-bromoethyl)benzene.
Example 171
3-(2-methylpyridin-4-yl)-5-(4-phenethylpiperazin-1-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole (Example 168), the tile compound was prepared from 5-chloro-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole and (2-bromo ethyl)benzene.
Example 172
5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-3-(2-methylpyridin-4-yl)-1,2,4-thiadiazole









In analogy to the procedure described for the synthesis of 3-(2-chloropyridin-4-yl)-5-(4-(2-(2-methoxypyridin-4-yl)ethyl)piperazin-1-yl)-1,2,4-thiadiazole (Example 168), the tile compound was prepared from 5-chloro-3-(2-chloropyridin-4-yl)-1,2,4-thiadiazole and 1-(2-(2-methoxypyridin-4-yl)ethyl)piperazine trihydrochloride.
The compounds of formula IA or I and their pharmaceutically usable addition salts possess valuable pharmacological properties. Specifically, it has been found that the compounds of the present invention are useful for treating certain neurological disorders characterized by dysfunction of TAU protein, which diseases comprise Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17). The compounds were investigated in accordance with the test given hereinafter.
Construction of a TAU Gene Over-Expressing Cell Line
A TAU expression plasmid was constructed by sub-cloning the cDNA encoding for human TAU-P301L protein, wherein proline at position 301 is substituted by a leucine residue, into mammalian expression vector pcDNA3.1 resulting in the plasmid pcDNA3.1-TAUP301L. Plasmids pcDNA3.1 and pcDNA3.1-TAU P301L were transfected into human neuroblastoma cells (BE-M17; ATCC No. CRL-2267™) using lipofectamine reagent and subsequently, independent clonal cell lines with the plasmids stably integrated into the genome were selected by antibiotic resistance selection (Geneticin (G418)), resulting in cell lines M17.pcDNA3 and M17 — 3TAUP301L. Expression of the TAUP301L gene in the M17 — 3TAUP301L cells was confirmed by Western blot analysis.
Use of TAU Expressing Cells as a Model of Neuronal Degeneration
The expression of TAU P301L in M17 — 3TAU(P301L) cells was found to confer increased toxicity relative to control cells expressing no TAU after 7 days of cell differentiation using retinoic acid (RA). Differentiation of the cells with RA leads to phosphorylation and subsequent aggregation of TAU, inducing a tauopathy in these cells. Cytotoxicity of cells was measured by quantification of lactate dehydrogenase (LDH) levels. In dead cells LDH is leaked out of the cells into the medium due to a loss of plasma-membrane integrity.
Briefly, 3 days preceding the experiment pre-cultures of M17.pcDNA3 and M17 — 3TAU(P301L) cells were prepared, starting from a stock culture, at a density of 50.000-100.000 cells/cm2 in detection medium (Optimem Reduced Serum without phenol red (Gibco, Cat. 31985-047) supplemented with 1% fetal calf serum (FCS), 1 mM sodium pyruvate, 1× non-essential amino acids (NEAA), 500 μg/ml G418 and 0.5× antibiotic/antimycotic (ABAM)). At the day of the experiment these precultures were diluted to ˜0, 1.106 cells/ml in detection medium without FCS and 60 μL of this suspension is dispensed per well into a 96-well microtiter plate. After 3 hours of incubation at 37° C./5% CO2 an equal volume of detection medium containing 2.5 μM RA was added and subsequently incubated for 7 days at 37° C./5% CO 2 . After 7 days, LDH activity was determined using the Promega Cytotox 96 Non-Radioactive cytotoxicity assay (Cat. G1780), according the manufacturer's instructions. Cytotoxicity is measured as the ratio of LDH increase in the supernatant divided by the LDH increase in the total cell suspension (sum of the LDH measured in cells and supernatant). FIG. 1 shows toxicity after 7 days of differentiation with retinoic acid in M17 — 3TAU(P301L) cells compared to M17.pcDNA3 cells. Toxicity is clearly higher in the M17 — 3TAU(P301L) cells demonstrating that it is specifically provoked by the presence of the mutant TAU P301 protein.
Use of the Neuroblastoma Tauopathy Model to Screen Compounds
The M17 — 3TAU(P301L) cell line makes it possible to assess the ability of novel compounds to inhibit TAU-induced cytotoxicity. Active inhibitors of Tauopathy in these cells were found to inhibit cytotoxicity or LDH increase in the medium of M17 — 3TAU(P301L) cells treated as described in Example above. Compounds were tested for their ability to hamper TAU-induced toxicity at different concentrations, ranging from low non-effective concentrations to high potent concentrations. Afterwards, the dose-dependent inhibition curve was used to calculate their EC 50 (Table 1).
Although the pharmacological properties of the compounds disclosed in this invention vary with structural change, active compounds most particularly possess EC 50 in a cell-based assay in a range from about 0.0001 to 1.0 μM.
The tested compounds show a EC 50 value (μM) as shown in the table below.











Example
EC 50 (μM)











2
0.5870


3
0.9874


4
0.1152


5
0.3963


6
0.2776


12
0.2685


13
0.2148


14
0.0048


15
0.0214


16
0.0653


17
0.0008


18
0.3672


19
0.0020


20
0.1740


21
0.0095


22
0.0042


23
0.0019


24
0.0007


25
0.0077


26
0.0049


27
0.0167


28
0.0452


29
0.0013


30
0.1469


31
0.0211


32
0.3682


33
0.1578


34
0.0014


35
0.0035


36
0.1189


37
0.0029


38
0.2112


39
0.0435


40
0.0141


41
0.0007


42
0.0003


43
0.0033


44
0.0023


45
0.0007


46
0.0312


47
0.0004


48
0.0006


49
0.0496


50
0.1688


51
0.1519


52
0.3270


53
0.0126


54
0.0161


55
0.0042


56
0.0055


57
0.0145


58
0.0022


59
0.0750


60
0.0412


61
0.0444


62
0.0687


63
0.0074


64
0.0098


65
0.0599


66
0.0015


67
0.0010


68
0.8992


69
0.0437


70
0.1945


71
0.4291


72
0.0943


73
0.0009


75
0.0134


76
0.0408


77
0.2611


78
0.0021


79
0.0028


80
0.0027


81
0.0006


82
0.0040


83
0.0095


84
0.0007


85
0.0031


86
0.0089


87
0.0131


88
0.1206


89
0.0016


90
0.0068


91
0.0009


92
0.0433


93
0.0009


94
0.0095


95
0.0031


96
0.0281


97
0.0513


98
0.0806


99
0.2714


100
0.0043


101
0.0032


102
0.0009


103
0.0034


104
0.0112


105
0.0021


106
0.0030


107
0.0722


108
0.0079


109
0.0030


110
0.0178


111
0.0031


112
0.0567


113
0.0171


114
0.0079


115
0.0023


116
0.0141


117
0.0058


118
0.1808


119
0.0250


120
0.0161


121
0.0346


122
0.0425


123
0.0946


124
0.4584


125
0.0030


126
0.0070


127
0.1092


128
0.1100


129
0.0923


130
0.0009


131
0.0013


132
0.0033


133
0.0014


134
0.0378


135
0.0045


136
0.0062


137
0.0062


138
0.0182


139
0.0472


140
0.0726


141
0.1983


142
0.0037


143
0.1427


144
0.6022


145
0.4615


146
0.0601


147
0.1761


148
0.0675


149
0.0030


150
0.1853


151
0.0082


152
0.2150


153
0.0059


154
0.0170


155
0.9765


156
0.0119


157
0.0290


158
0.9984


159
0.1192


160
0.0004


161
0.0396


162
0.0033


163
0.0130


164
0.0034


165
0.0011


166
0.0007


167
0.0059


168
0.0015


169
0.0104


170
0.0007


171
0.0024


172
0.0144


173
0.0029


174
0.0126


175
0.0134


176
0.0195


177
0.0010


178
0.0132


179
0.0034


180
0.1294


181
0.0316


182
0.1917


183
0.1518




































































































































































































The compounds of formula IA or I and the pharmaceutically acceptable salts of the compounds of formula IA or I can be used as medicaments, e.g. in the form of pharmaceutical preparations. The pharmaceutical preparations can be administered orally, e.g. in the form of tablets, coated tablets, dragés, hard and soft gelatine capsules, solutions, emulsions or suspensions. The administration can, however, also be effected rectally, e.g. in the form of suppositories, or parenterally, e.g. in the form of injection solutions.
The compounds of formula IA or I can be processed with pharmaceutically inert, inorganic or organic carriers for the production of pharmaceutical preparations. Lactose, corn starch or derivatives thereof; talc, stearic acids or its salts and the like can be used, for example, as such carriers for tablets, coated tablets, dragés and hard gelatine capsules. Suitable carriers for soft gelatine capsules are, for example, vegetable oils, waxes, fats, semi-solid and liquid polyols and the like. Depending on the nature of the active substance no carriers are however usually required in the case of soft gelatine capsules. Suitable carriers for the production of solutions and syrups are, for example, water, polyols, glycerol, vegetable oil and the like. Suitable carriers for suppositories are, for example, natural or hardened oils, waxes, fats, semi-liquid or liquid polyols and the like.
The pharmaceutical preparations can, moreover, contain preservatives, solubilizers, stabilizers, wetting agents, emulsifiers, sweeteners, colorants, flavorants, salts for varying the osmotic pressure, buffers, masking agents or antioxidants. They can also contain still other therapeutically valuable substances.
Medicaments containing a compound of formula IA or I or a pharmaceutically acceptable salt thereof and a therapeutically inert carrier are also an object of the present invention, as is a process for their production, which comprises bringing one or more compounds of formula IA or I and/or pharmaceutically acceptable acid addition salts and, if desired, one or more other therapeutically valuable substances into a galenical administration form together with one or more therapeutically inert carriers.
The most preferred indications in accordance with the present invention are those, which include disorders of the central nervous system, for example the treatment or prevention of Alzheimer's disease, Pick's disease, corticobasal degeneration, progressive supranuclear palsy, frontotemporal dementia and parkinsonism (linked to chromosome 17, FTDP-17).
The dosage can vary within wide limits and will, of course, have to be adjusted to the individual requirements in each particular case. In the case of oral administration the dosage for adults can vary from about 0.01 mg to about 1000 mg per day of a compound of general formula I or of the corresponding amount of a pharmaceutically acceptable salt thereof. The daily dosage may be administered as single dose or in divided doses and, in addition, the upper limit can also be exceeded when this is found to be indicated.
Tablet Formulation (Wet Granulation) mg/tablet Item Ingredients 5 mg 25 mg 100 mg 500 mg 1. Compound of formula I 5 25 100 500 2. Lactose Anhydrous DTG 125 105 30 150 3. Sta-Rx 1500 6 6 6 30 4. Microcrystalline Cellulose 30 30 30 150 5. Magnesium Stearate 1 1 1 1 Total 167 167 167 831
Manufacturing Procedure
1. Mix items 1, 2, 3 and 4 and granulate with purified water. 2. Dry the granules at 50° C. 3. Pass the granules through suitable milling equipment. 4. Add item 5 and mix for three minutes; compress on a suitable press.

Capsule Formulation mg/capsule Item Ingredients 5 mg 25 mg 100 mg 500 mg 1. Compound of formula I 5 25 100 500 2. Hydrous Lactose 159 123 148 — 3. Corn Starch 25 35 40 70 4. Talc 10 15 10 25 5. Magnesium Stearate 1 2 2 5 Total 200 200 300 600
Manufacturing Procedure
1. Mix items 1, 2 and 3 in a suitable mixer for 30 minutes. 2. Add items 4 and 5 and mix for 3 minutes. 3. Fill into a suitable capsule.