(en)7 - (A - (3 - IMIDOYLUREIDO) ARYLACETAMIDO) CEPHALOSPORANIC ACIDS AND THEIR SALTS AD THE CORRESPONDING BETAINES AND DESACETOXY DERIVATIVES ARE VALUABLE AS ANTIBACTERIAL AGENTS, NUTRITIONAL SUPPLEMENTS IN ANIMAL FEEDS, THERAPEUTIC AGENTS IN POULTY AND ANIMALS, INCLUDING MAN, AND ARE ESPECIALLY USEFUL IN THE TREATMENT OF INFECTIOUS DISEASES CAUSED BY GRAM-POSITIVE AND GRAM-NEGATIVE BACTERIA. 7 - (D - A -(3-BENZIMIDOYLUREIDO)PHENYLACETAMIDO) CEPHALOSPORANIC ACID, A PREFERRED EMBODIMENT OF THE INVENTION, IS PREPARED, FOR EXAMPBLE, BY RANEY NICKEL HYDROGENATION (50 P.S.I.. R.T.) OF AN AQUEOUS SOLUTION OF SODIUM 7-(D-A(3-PHENYL-1,2,4-OXADIAZOLE-5-AMINO) PHENYLACETAMIDO)CEPHALOSPORANATE WHICH IS PREPARED IN TURN BY REACTION OF SODIUM CEPHALOGLYOIN WITH 5-CHLORO-3PHENYL-1,2,4-OXADIAZOLE.

1.ApplicationNumber: US-3646024D-A
1.PublishNumber: US-3646024-A
2.Date Publish: 19720229
3.Inventor: CHARLES TRUMAN HOLDREGE

4.Inventor Harmonized: HOLDREGE CHARLES TRUMAN()

5.Country: US
6.Claims:
(en)7 - (A - (3 - IMIDOYLUREIDO) ARYLACETAMIDO) CEPHALOSPORANIC ACIDS AND THEIR SALTS AD THE CORRESPONDING BETAINES AND DESACETOXY DERIVATIVES ARE VALUABLE AS ANTIBACTERIAL AGENTS, NUTRITIONAL SUPPLEMENTS IN ANIMAL FEEDS, THERAPEUTIC AGENTS IN POULTY AND ANIMALS, INCLUDING MAN, AND ARE ESPECIALLY USEFUL IN THE TREATMENT OF INFECTIOUS DISEASES CAUSED BY GRAM-POSITIVE AND GRAM-NEGATIVE BACTERIA. 7 - (D - A -(3-BENZIMIDOYLUREIDO)PHENYLACETAMIDO) CEPHALOSPORANIC ACID, A PREFERRED EMBODIMENT OF THE INVENTION, IS PREPARED, FOR EXAMPBLE, BY RANEY NICKEL HYDROGENATION (50 P.S.I.. R.T.) OF AN AQUEOUS SOLUTION OF SODIUM 7-(D-A(3-PHENYL-1,2,4-OXADIAZOLE-5-AMINO) PHENYLACETAMIDO)CEPHALOSPORANATE WHICH IS PREPARED IN TURN BY REACTION OF SODIUM CEPHALOGLYOIN WITH 5-CHLORO-3PHENYL-1,2,4-OXADIAZOLE.

7.Description:
(en)United States Patent O 3,646,024 7 a-(3-IMID YLURElD0)-ARYLACETAMIDO] CEPHALOSPORANIC ACIDS Charles Truman Holdrege, Camillus, N.Y., assignor to Bristol-Myers Company, New York, N. No Drawing. Filed Sept. 4, 1969, Ser. No. 855,375 Int. Cl. C07d 99/24 U.S. Cl. 260-243 C 29 Claims ABSTRACT OF THE DISCLOSURE 7 [u (3 imidoylureido)arylacetamido]cephalosporanic acids and their salts and the corresponding betaines and desacetoxy derivatives are valuable as antibacterial agents, nutritional supplements in animal feeds, therapeutic agents in poultry and animals, including man, and are especially useful in the treatment of infectious diseases caused by gram-positive and gram-negative bacteria. 7 [D-u-(3-benzimidoyluredio)phenylacetamido] cephalosporanic acid, a preferred embodiment of the invention, is prepared, for example, by Raney nickel hydrogenation (50 p.s.i., RT.) of an aqueous solution of sodium 7-[D-a-(3-phenyl-1,2,4-oxadiazole amino) phenylacetamido]cephalosporanate which is prepared in turn by reaction of sodium cephaloglycin with 5-chloro-3- phenyl-1,2,4-oxadiazole.
BACKGROUND OF THE INVENTION (1) Field of the invention The cephalosporins of the present invention possess the usual attributes of such compounds and are particularly useful in the treatment of bacterial infections.
(2) Description of the prior art Cephalothin and cephaloridine are well-known antibacterial agents. The literature also contains considerable data on the activity of cephaloglycin and cephalexin. The literature on cephalosporins has been reviewed by E. P. Abraham, Quart Rev. (London), 21, 231 (1967), by E. Van Heyningen, Advan. Drug Res., 4, 1-70, (1967) and briefly by L. C. Cheney, Annual Reports in. Medicinal Chemistry, 1967, Academic Press Inc., 111 Fifth Ave., New York, N.Y. 10003, on pages 96 and 97.
The preparation of various 7-[a-amino-arylacetamido} cephalosporanic acids and the corresponding desacetoxy compounds in which aryl represents unsubstituted or substited phenyl or 2- or 3-thienyl is described in British specifications 985,747, 1,017,624, 1,054,806 and 1,123,- 333, in Belgian Pat. 696,026 (Farmdoc No, 29,494), in US. Pats. 3,311,621 and 3,352,858, in Japanese Pat. 1687/66 (Farmdoc No. 23,231), by Spencer et al., J. Med. Chem., 9 (5) 746-750 (1966) and by Kurita et al., J. Antibiotics (Tokyo) (A) 19, 243-249 (1966).
Ring-substituted a-aminobenzylcephalosporins can also be made by standard methods from the 2-phenylglycines reported by A. H. Neims et al., Biochemistry (Wash) 5(1), 203-213 (January 1966) and by P. Friis et al., Acta Chemica Scandinavica 17 (9), 2391-2396 (1963).
Additional information is given concerning the synthesis of ring-substituted 2-phenylglycines by Doyle et al., J. Chem. Soc., 1440 (1962) and Ryan et al., J. Med. Chem. 12, 310-313 (1969). As stated by Ryan et a1. such amino acids are converted into N-t-butoxycarbonyl derivatives by the method of Schwyzer et al., Helv. Chim. Acta. 42, 2622 (1959); Ryan et al. also give an illustrative example of the resolution of such a derivative by the use of cinchonine.
3,646,024 Patented Feb. 29, 1972 Netherlands patents 6811676 (Farmdoc 36,349) and 6812382 (Farmdoc 36,496) disclose ring-substituted cephaloglycins.
Various 7 [a amino-arylacetamido]cephalosporins in which one hydrogen of the a-amino group is replaced by a carbonyl group which is attached in turn to another moiety have been reported. The earliest were the cephaloglycin and cephalexin precursors in which use was made of a common peptide blocking group such as carbobenzyloxy as illustrated in US. Pat. 3,364,212, Belgian Pat. 675,298 (Farmdoc 22,206), South African Pat. 67/1260 (Farmdoc 28,654) and Belgian Pat. 696,026 (Farmdoc 29,494). Later examples are my own 7-(a-3-acylureidoarylacetamido)cephalosporins in my US. application Ser. No. 792,757, filed Jan. 21, 1969, and the 7-[Ot-(3- guanyl-l-uredio)-arylacetamido]cephalosporins of my colleague, Donald Neil McGregor, disclosed in his US. application Ser. No. 793,909 filed J an. 24, 1969 and issued May 18, 1971 as U.S. Pat. 3,579,514.
The penicillins having the same side-chains as the cephalosporins of the present invention are the subject of my US. application Ser. No. 846,969, filed Aug. 1, 1969.
SUMMARY OF THE INVENTION Compounds, preferably of the D configuration, having the formulae wherein A is hydrogen, acetoxy, pyridinium, picolinium or lutidinium; and M is hydrogen or a pharmaceutically acceptable nontoxic cation or an anionic charge when A is one of said quaternary ammonium radicals and Ar is 2-thienyl, 3-thienyl or R R and R each is hydrogen, nitro, (lower) alkylamino, di(lower)alkylamin0, (lower)alkanoylamino, amino, hydroxy, (lower) alkanoyloxy, (lower)alky1 (comprising straight and branched chain saturated aliphatic groups having from 1 to 6 carbon atoms inclusive), (lower)alkoxy, sulfamyl, chloro, iodo, bromo, fluoro or trifluoromethyl; Z is (lower) alkyl, cycloalkyl having 4, 5, 6 or 7 carbon atoms, monohalo (lower) alkyl, dichloromethyl, tri chloromethyl, (lower)alkenyl of 2 to 6 carbon atoms,
O CH;
C- 4 3 l It R N O or O CH-s wherein n is an integer from 0 to 3 inclusive and R R and R each is hydrogen, nitro, di(lower)alkylamine, (lower) alkanoylamino, (lower) alkanoyloxy, (lower) alkyl (comprising straight and branched chain saturated aliphatic groups having from 1 to 6 carbon atoms inclusive), (lower)alkoxy, sulfamyl, chloro, iodo, bromo, fluoro or trifluoromethyl. Examples of typical cations are any nontoxic, pharmaceutically acceptable metallic cations such as sodium, potassium calcium, aluminum, and the like, the ammonium cation and substituted ammonium cations, e.g., cations of such nontoxic amines as tri(lower) alkylamines, i.e., triethylamine, etc., procaine, dibenzylamine, N-benzyl-l-beta-phenethylamine, l-ephenamine, N,N'-dibenzylethylenediamine, dehydroabietylamine, N, N'-bis-dehydroabietylethylenediamine, N (lower)alkylpiperidine, e.g., N-ethylpiperidine, or other such amines which have been used to form pharmaceutically acceptable nontoxic salts with benzylpenicillin. Such salts are preferably made by treatment of the free acid (or zwitterion) form of the product with a strong base.
In the preferred embodiments of this invention, Ar is Z-thienyl, 3-thienyl, or phenyl in which R R and R are each hydrogen, hydroxy or amino (and preferably R and R are hydrogen); the a-carbon of the side chain (to which the substituted amine group is attached) is of the D configuration; Z is phenyl, thienyl, furyl or (lower) alkyl and, preferably, phenyl, 2-thienyl, S-thienyl, 2-furyl or methyl; and A is hydrogen or acetoxy or pyridinium.
DETAILED DESCRIPTION It was an object of the present invention to provide compounds useful in the treatment of infections caused bygram-positive and gram-negative bacteria.
The compounds of the present invention as defined above under Summary of the Invention are particularly useful in that they possess antibacterial activity against both gram-positive and gram-negative bacteria.
The tit-carbon atom of the cephalosporin side chain (to which the substituted amino group is attached) is an asymmetric carbon atom and the compounds of this invention can therefore exist in two optically active isomeric forms [the D- and L-diasteroisomers], as well as in the 'DL form which is a mixture of the two optically active forms; all such isomeric forms of the compounds are included within the scope of the present invention but the D form is preferred. Also included within the scope of the present invention are easily hydrolyzed esters which are converted to the free acid form by chemical or enzymatic hydrolysis, as illustrated in Belgian Pat. 684,288 and in US. Pat. 3,284,451.
It should be noted in connection with the foregoing consideration of the diastereoisomers of this invention that many isomers other than the two caused by the asymmetric carbon of the side chain are possible due to the presence of asymmetric" carbon atoms in the '7-aminocephalosporanic acid nucleus. Such additional isomers, however, are not presently significant since 7 aminocephalosporanic acid which is the product of fermentation processes is consistently of one configuration; such '1'- aminocephalosporanic acid is presently used in the production of the compounds of this invention.
The cephalosporins of the present invention containing the a (3-substituted-1,2,4 oxadiazole-5-yl-amino) group are primarily useful as intermediates for the preparation of the corresponding cephalosporins containing the a-(3- substituted-imidoylureido) group. The latter are far more potent antibacterial agents. 7 V v In this treatment of bacterial infections .in man, the compounds of this invention containing the a-(3'-s ubstituted imidoylureido) group are administered topically, orally and parenterally in accordance with conventional procedures for antibiotic administration in an amount of from about 5 to mg./kg./day and preferably in the range of 15 to 50 mg./kg./day for bacterial infections in divided dosages, e.g., three or four times a day. They are administered in dosage units containing, for example, 125, 250, 500, 1000 and 2000 mg. of active ingredient with suitable physiologically acceptable carriers or excipients. The dosage units can be in the form of liquid preparations such as solutions, dispersions, emulsions or in solid form such as tablets, capsules, etc.
The compounds of the present invention are also useful for decontamination of filling machines and containers used for cosmetics and topical drugs to prevent or at least reduce the very common contamination of such products with bacteria. In such instance, use is made of an aqueous solution having a concentration of at least 1 mgm./ml. and a contact time of at least one hour.
The compounds of Formula II above are preferably cephalosporin of the formula or amonohydrate or polyhydrate or salt thereof with an oxadiazole of the formula Z zj tll wherein Ar and Z have the meaning set out above and A is hydrogen or acetoxy. The reaction is preferably conducted using about equimolar quantities of the two reagents in the presence of a base, preferably an inorganic base such as sodium hydroxide or sodium carbonate or an organic base such as a pyridine, N-methyl-piperidine, tri- (lower)alkylamine, or the like, and preferably in a solvent such as water, dioxane, dimethylformamide, dimethylsulfoxide, chloroform, tetrahydrofuran, n pentane, methylene chloride, but preferably water, while preferably maintaining the pH above 6 and preferably in the range of pH 8.59.0 at a temperature in the range of about 20 C. to 50 C., but preferably about 0 C. to 20 C., and preferably with agitation.
The compounds of Formula II above are converted into those of Formula I by hydrogenation and preferably by hydrogenation at about room temperature over Ran'ey nickel catalyst of an aqueous solution of a salt of the com pound of Formula II and preferably a sodium or potassium salt. The hydrogen pressure is preferably about 50 p.s.i. or higher.
The betaines are produced by reacting the compounds above in which A is acetoxy with pyridine, picoline or lutidine by the method of Spencer et al., J. Org. Chem., 32. 500 (1967).
The compounds of Formula 11 above can also be prepared by direct acylation of 7-an1inocephalosporanic acid or 7-amino-3 desacetoxycephalosporanic acid or a salt thereof with an acid chloride of the formula ll Ar-CH-C-Cl These examples are given in illustration of, but not in limitation of, the present invention. All temperatures are in degrees centigrade. Skellysolve B is a petroleum ether fraction of B.'P. 6068 C; consisting essentially of nhexane.
A DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLE 1 -hydroxy-3-phenyl-1,2,4-oxadiazole: A solution of 103.1 g. (1 mole) of benzonitrile in 400 ml. of 95% ethanol was added to a mixture of 53 g. (0.5 mole) of sodium carbonate, 69.5 g. (1 mole) of hydroxylamine hydrochloride, 200 ml. of water and 300 ml. of 95% ethanol. The mixture was refluxed for 18 hours. Most of the ethanol was distilled off and additional water was added. The product, which crystallized on cooling, was filtered, washed with water, and air dried. The product was dissolved in benzene and the benzene distilled ofl" to remove any-remaining water leaving a crystalline residue of benzamide oxime (lit. ref. Beil; 9, 304, II 214).
Ethyl chloroformate (47.4 ml, 0.5 mole) was added in a rapid stream to a warm solution of the benzamide oxime in 250 ml. of benzene. The mixture was refluxed for minutes, cooled slightly and 500ml. of water added. The benzene was distilled off and the remaining aqueous mixture was refluxed for 2.5 hours giving a one phase solution. After cooling, thecrystalline 5-hydroxy-3-phe-nyl-1,2, 4-oxadiazole was collected by filtration, washed with a small amount of water and purified by dissolving in dilute aqueous sodium hydroxide and acidifying with acetic acid; yield 22 g., M.P. 198-201 (lit. ref. Beil. 27, 644, II 698).
5-chloro-3-phenyl-1,2,4-oxadiazole: A mixture of 22 g. of 5-hydroxy-3-phenyl-1,2,5-0xadiazole, 55.8 ml. of phosphorus oxychloride and 5 m1. of pyridine was refluxed for 17.5 hours. The excess phosphorus oxychloride was removed at reduced pressure. Water and ice was added to the residue and the mixture was extracted with ether. The ether phase was dried with sodium sulfate and the 6 solvent distilled off. Benzene was added to the residue and this was distilled off to remove any remaining water. Vacuum distillation of the residue afforded 17.3 g., B.P. 112 (3 mm.) of 5-chloro-3-phenyl-1,2,4-oxadiazole (lit. ref. C. A. 65, P 732).
7 [D 1-(3-phenyl-1,2,4-0xadiazole-5-amin0)phenylacetamido[cephalosporanic acid: A suspension of 8.5 g. of cephaloglycin (hydrate) in 60 ml. of water was adjusted to pH 9.0 with aqueous sodium carbonate solution. To this was added 50 ml. of dioxane followed by 3.6 g. of 5-chloro-3-phenyl-1,2,4-oxadiazole. The mixture was stirred for 2 hours at room temperature while sodium carbonate solution (2.1 g. of sodium carbonate in 25 ml. of water) was added as needed to maintain the systern at pH 8.58.9. The reaction mixture was adjusted to pH 7.0 with 6 N hydrochloric acid and the dioxane was stripped off at reduced pressure. The aqueous concentrate was readjusted to pH 7 and extracted once with ethyl acetate. The aqueous phase was layered with a large volume of ethyl acetate and acidified to pH 2.5 with 6 N hydrochloric acid. The mixture was filtered prior to separating the phases to remove a small amount of insoluble material. The ethyl acetate phase was washed three times with water, dried with sodium sulfate and filtered. The filtrate was concentrated to a small volume causing the cephalosporin free acid to crystallize. Anhydrous ether was added to the crystalline mass and the flask stored overnight in the cold. There was obtained after filtering and washing with anhydrous ether 5.2 g. of 7-[D-a-(3-phenyl- 1,2,4 oxadiazole 5 amino)phenylacetamido]cephalosporanic acid; M.P. 157l60 dec. with prior shrinking. The infrared spectrum was consistent for the desired compound.
Analysis.Calcd for C H N O S-H O (percent): C, 55.02; H, 4.44; N, 12.34. Found (percent): C, 55.26; H, 4.53; N, 12.55.
EXAMPLE 2 NH (i) 7 [D u (3 benzimidoylureido)phenylacetamido] cephalosporanic acid: The solution prepared by dissolving 4 g. of 6-[D-a-(3-phenyl-1,2,4-oxadiazole-5-amino) phenylacetamido] cephalosporanic acid in ml. of Water with sodium lbicarbonate (pH 7.3) was hydrogenated in the presence of commercial Raney nickel catalyst (No. 28) on a Paar hydrogenation apparatus at an initial pressure of 50 p.s.i. at room temperature for 1 hour and 20 minutes. The catalyst was removed by filtration. The filtrate was adjusted to pH 5 with 6 N hydrochloric acid. The product was filtered, Washed with water and acetone, and dried in vacuo over phosphorus pentoxide; yield 2.0 g., M.P. 150-160 dec. The infrared and nuclear magnetic resonance spectra were consistent for 7-[D-a-(3-benzimidoylureido phenylacetamido] cephalosporanic acid.
Analysis.-Calcd for C2 H25N5OqS'2H2O (percent): C, 53.14; H, 4.97; N, 11.92. Found (percent): C, 52.40; H, 5.03; N, 12.02.
EXAMPLE 3 o 0 @on-h-aoa-omoiiom 5 -hydroxy-3- (2'-thienyl) l ,2,4-oxadiazole: A mixture of 176.1 g. (1.61 mole) of Z-thienonitrile, 111.9 g. (1.61 mole) of hydroxylamine hydrochloride, 85.3 g. (0.805 mole) of sodium carbonate, 1 liter of 95% ethanol and 300 ml. of water was heated at reflux for 17 hours. A small amount of solid was removed by filtration. Additional water was added to the filtrate and the ethanol was stripped off at reduced pressure causing the crystalline product to separate. The filtered product was washed with water. The crude product was heated with benzene most of it going into solution. Cooling this mixture gave after filtration and drying 170.9 g. of 2-thiophenecarboxamide oxime; M.P. 87--88 (lit. ref. Beil. 18, 290).
Ethyl chloroformate (130.2 g., 1.2 mole) was added gradually to a heated and stirred solution of 170.9 g. (1.2 mole) of Z-thiophenecarboxamide oxime, 96.5 ml. of pyridine and 300 ml. of benzene. An exothermic reaction took place which caused the mixture to reflux. The mixture was refluxed for 15 minutes after the addition of ethyl chloroformate was complete. The mixture was cooled slightly and 600 ml. of water was added. The benzene was distilled off and the remaining aqueous mixture was refluxed for 2.5 hours. After cooling overnight the product was filtered and washed with water. The crude product was dissolved in dilute aqueous sodium hydroxide, the solution carbon treated, and reprecipitated by acidification with acetic acid. There was obtained 139.4 g. of 5-hydroxy-3-(2' -tl1ienyl) 1,2,4 oxadiazole; M.P. 185-190 dec. The nuclear magnetic resonance and infrared spectra were consistent for the desired compound.
5-chloro-3-(2'-thienyl)-1,2,4-oxadiazole: A mixture of 60 g. of 5-hydroxy-3-(2'-thienyl)-1,2,4-0xadiazole, 150 ml: of phosphorus oxychloride and 13.6 ml. of pyridine was refluxed for 16 hours. The excess phosphorus oxychloride was stripped off at reduced pressure. The residue was treated with ice and water and extracted several times with ether. The combined organic extracts were washed with water and dried with sodium sulfate. The ether was distilled 011, the residue was vacuum distilled giving 11.1 g., B.P. 70 (1.5 mm.) of 5-ch1oro-3-(2- thienyl)-1,2,4-oxadiazle which crystallized, M.P. 33-35".
Sodium 7-{D-a-[3-(2'-thienyl) 1,2,4 oxadiazole amino]phenylacetamido}cephalosporanate: A suspension of 10 g. of cephaloglycin (hydrate) in 65 ml. of Water was adjusted to pH 9.0 with aqueous sodium carbonate solution. To this was added ml. of dioxane followed by a solution of 4.5 g. of 5-chloro-3-(2-thienyl)-1,2,4- oxadiazole in 30 ml. of dioxane. The mixture was stirred for 2 hours at room temperature while sodium carbonate solution was added as needed to maintain pH 8.5-8.9. The mixture was adjusted to pH 7.0 and extracted with ethyl acetate. The aqueous-dioxane phase was stripped at reduced pressure to remove dioxane. The aqueous concentrate was readjusted to pH 7 and extracted again with ethyl acetate. The aqueous phase was layered with ethyl acetate and acidified to pH 2.5 with 6 N hydrochloric acid. Some insoluble material was removed by filtration prior to separation of the phases. Two more extractions with ethyl acetate were made. The combined organic extracts were washed three times with water, dried with sodium sulfate, filtered and treated with 8.5 ml. (1 eqv.) of sodium Z-ethylhexanoate in l-butanol. The solution was concentrated and a small amount of solid filtered otf. The solvent was removed completely and the oily residue was triturated with anhydrous ether producing a filterable solid. The product was filtered, Washed with anhydrous ether and dried in vacuo over phosphorus pentoxide; yield 9.3 g., M.P. decomposes above 150 with prior softening. The infrared spectrum was consistent for sodium 7-{D-a-[3-(2-thienyl) 1,2,4 oxadiazole 5 amino] phenylacetamido}cephalosporanate.
Analysis.Calcd for C H N O S Na (percent): C, 49.91; H, 3.49. Found (percent): C, 48.00; H, 4.13; H O, 3.3.
Found values corrected for 3.3% H 0: C, 49.7; H, 3.8.
Sodium 7-{jD-u-[3-(2-thienimidoyl)ureido1phenylacetamido}-cephalosporanate: A solution of 9.1 g. of sodium 6 {D u [3-(2'-thienyl) 1,2,4 oxadiazole-S-amino] phenylacetamido}cephalosporanate in 160 ml. ofwater was hydrogenated in the presence of commercial Raney nickel catalyst (No. 28) at an initial pressure of 50 psi. at room temperature for 2.25 hours. The catalyst was removed by filtration. The filtrate was adjusted to pH 5.0. The precipitate was collected by filtration, washed with water and dried in vacuo over phosphorus pentoxide. The compound was suspended in ml. of water and brought into solution at pH 8.0 with aqueous sodium carbonate. The solution was filtered and the solvent removed at reduced pressure. Benzene was added to the residue and stripped 011 to azeotrope out remaining water. The benzene treatment was repeated twice. The residue was suspended in 95% ethanol and water added dropwise to dissolve the solid. The filtered solution was diluted to the cloud point with ethyl acetate. Cooling in ice and further dilution with ethyl acetate produced crystalline sodium 7- {D cc [3 (2' thienimidoyl)ureido] phenylacetamido} cephalosporanate. The filtered product was washed with ethyl acetate, dried in vacuo over phosphorus pentoxide and further dried at 60 for 3 hours; yield 2.4 g., decomposes above 170 with prior darkening. The infrared and nuclear magnetic resonance spectra were consistent.
Analysis.Calcd for C H N O S Na-2H O (percent): C, 46.82; H, 4.26; N, 11.38. Found (percent): C, 46.46; H, 3.66; N, 11.62.
The Minimum Inhibitory Concentration (M.I.C.) of this product in meg/ml. versus a strain of Pseudomonas aeruginosa was determined by overnight incubation at 37 C. in Nutrient Broth by serial two-fold tube dilution and found to be mcg./ml.
3-(2-furyl)-5-hydroxy-1,2,4-oxadiazole: A mixture of 69.5 g. (0.746 mole) of 2-furylnitrile [Ben 14, 1058 (1881)], 51.8 g. (0.746 mole) of hydroxylamine hydrochloride, 39.5 g. (0.373 mole) of sodium carbonate, 500 ml. of 95% ethanol and ml. of water was" refluxed overnight. The mixture was filtered and 150 ml. of water was added. The ethanol was stripped off at reduced pressure. The aqueous phase was extracted several times with ethyl acetate. The combined organic extractswere carbon treated, dried with sodium sulfateand the solvent removed at reduced pressure leaving 88.9 g. of 2-furylamide oxime as a viscous oil (lit. ref. C. A. 52, 7292b).
Ethyl chloroformate (76.5 g., 0.705 mole) was added slowly to a heated and stirred solution of 88.9 g. of 2- furylamide oxime 56.7 ml. (0.705 mole) of pyridine and 200 ml. of benzene. After the addition'of ethyl chloroformate was complete the reaction mixturewas refluxed an additional 15 minutes. Water (400 ml.) was added and the benzene distilled off. The remaining aqueous mixture was refluxed for 2.5-3 hours. After cooling in an icebath the solid product was collected by filtration and washed with water. The product was dissolved in dilute aqueous sodium hydroxide solution, carbon treated, the solution acidified with acetic acid with ice cooling and the repreci-pitated product filtered and washed carefully with ice water. The product was again purified in the same manner giving after drying in vacuo over phosphorus pentoxide 50.1 g. of 3-(2'-furyl)-5-hydroxy-1,2,4-oxadiazole; dec. above 210.
Analysis.-Calcd for C H N O (percent): C, 47.37; H, 2.65; N, 18.42. Found (percent): C, 47.27; H, 2.91; N, 18.39.
Sodium 7 {D a [3-(2'-furyl)-1,2,4-oxadiazole-5- amino]-phenylacetamido}cephalosporanate: A mixture of 50 g. (0.328 mole) 3-(2-furyl)-5-hydroxy-l,2,4-oxadiazole, 125 m1. of phosphorus oxychloride and 11.3 ml. of pyridine was refluxed for 16 hours. The excess phosphorus oxychloride was removed at reduced pressure and the residue was poured into about 500 ml. of Water and crushed ice. The mixture was extracted three times with ether, some insoluble material being filtered off during the first extraction. The combined ether extracts were washed three times with water, dried with sodium sulfate and concentrated at reduced pressure. To the residue was added Skellysolve B and some solid (identified as starting material) removed by filtration. The filtrate was stripped of solvent at reduced pressure leaving a solid residue of chloro compound. This product was used without further purification.
A suspension of 10.0 g. of cephaloglycin (hydrate) in 65 ml. of water was adjusted to pH 9.0 with aqueous sodium carbonate. Dioxane (30 ml.) was added followed by a solution of 3.8 g. of the above obtained chloro compound in 30 ml. of dioxane. The mixture was stirred for 2 hours at room temperature while aqueous sodium carbonate was added as needed to maintain pH 8.5-8.9. The dioxane was removed at reduced pressure. The aqueous concentrate was adjusted to pH 7.0 and extracted twice with ethyl acetate. The aqueous phase was layered with ethyl acetate and adjusted to pH 2.5 with 6 N hydrochloric acid. Insoluble material was removed by filtration prior to separation of the phases. The aqueous phase was extracted twice more with ethyl acetate. The combined organic extracts were Washed twice with water, dried over sodium sulfate and treated with 8.5 ml. (1 equivalent) of sodium Z-ethylhexanoate in l-butanol. The solvent was partially stripped off at reduced pressure, decanted into another fiask and the remainder stripped off. The residue was triturated with anhydrous ether giving a filterable solid. The product was collected by filtration, washed with anhydrous ether and dried over phosphorus pentoxide; yield 5.5 g. of sodium 7-{D-ot-[3-(2'-furyl)-l,2,4-oxadiazole 5 amino]phenylacetamido}cephalosporanate, decomposes above 130 with prior darkening. The infrared and nuclear magnetic resonance spectra were consistent for the desired product.
Analysis.Calcd for C H N O SNa (percent): C, 51.33; H, 3.59. Found (percent): C, 49.22; H, 4.18; H O, 2.9.
Found values corrected for 2.9% H C, 50.7; H, 3.9.
EXAMPLE6 o 0 H & prr-o AoA oH2o 0113 NH l r l HI IC J H 0 NH Sodium 7 {D-a-[3-(2-furimidoyl)ureidojphenylacetamido}cephalosporanate: A solution of 4.0 g. of sodium 7-{D-a-[3-(2'-furyl)-1,2,4-oxadiazole amino] phenylacetamido}cephalosporanate in 120 ml. of water was bydrogenated in the presence of commercial Raney nickel catalyst on a Paar hydrogenation apparatus at an initial pressure of 50 p.s.i. for 2 hours at room temperature. The
catalyst was removed by filtration. The filtrate was adjusted to pH 3.0. The precipitate was collected by filtration and washed with water; yield 2.5 g. A suspension of the product in about 60 ml. of water was brought into solution by adjusting to pH 8 with sodium carbonate solution. The filtered solution was stripped of solvent at reduced pressure. Benzene was added to the residue and distilled off at reduced pressure to remove remaining water. The residue was triturated with anhydrous ether giving a filterable solid. The solid was suspended in ethanol and water added dropwise until the material dissolved. After removal of a small amount of insoluble material by filtration ethyl acetate was added causing crystallization of the product. The filtered product was washed with ethyl acetate and sparingly with acetone and dried in vacuo over phosphorus pentoxide; yield 1.0 g., sodium 7-{D-a-[3-(2-furimidoyl)ureido]phenylacetamido}cephalosporanate M.P. 170174 decomposes with prior darkening. The infrared and nuclear magnetic resonance were consistent for the desired compound.
The Minimum Inhibitory Concentration (M.I.C.) of this product in mcg./ ml. versus a strain of Pseudomarias aeruginosa was determined by overnight incubation at 37 C. in Nutrient Broth by serial two-fold tube dilution and found to be meg/ml.
EXAMPLE 7 CHEACACH OECH3 U in...
s 0=t NH 7 [D-et-(B benzimidoylureido)-3-thienylacetamido] cephalosporanic acid: This compound is prepared by substituting an equimolar weight of 7-(D-a-amino-3-thienylacetamido)cephalosporanic acid for the cephaloglycin hydrate in the procedure of Examples 1 and 2.
EXAMPLE 8 The procedures of Examples 1 and 2 are repeated while replacing the benzonitrile used therein with an equimolar weight of the nitrile prepared by P 0 dehydration of each of the corresponding amides having the following structures.
CONH2 --CONH3 II3C- CONH m l l l t S N and wherein Z is ig... and U When necessary the amide is prepared by converting the corresponding acid to its acid chloride with thionyl chloride and thence to the amide by treatment of the acid chloride with ammonia in the usual manner.
EXAMPLE 9 1 QOH-ii-ACA-Qmwom NH O OH o cn-r i-xon-cmoiicna I T NH O OH and : NHCR EXAMPLE 10 6B orr ii-Ao.t-om- 7 [D a (3 benzimidoylureido)phenylacetamidol]- 3-(1-pyridylmethyl)3-cepheme-4-carboxylic acid betaine: A suspension of 1.5 g. of 6-[D-a-(3-benzimidoylureido) phenylacetamido]-cephalosporanic acid in ml. of water was brought into solution by adjusting to pH 8.5 with aqueous sodium carbonate. Pyridine (0.85 ml.) and 0.53 g. of potassium thiocyanate were added and the solution was adjusted to pH 6.7 with 42% phosphoric acid. The solution was heated to 40-45 for six hours. The reaction mixture was cooled to room temperature and slurried with 25 ml. of a 25% solution of Amberlite LA-l resin acetate form in methyl isobutyl ketone [Spencer et aL, J. Med. Chem. 9, 746 (1966), footnote 14]. The insoluble material was separated by filtration and washed well with methyl isobutylketone. The resin and aqueous phases were separated and the aqueous phase again extracted with 25 ml. of resin solution. The aqueous phase was washed three times with methyl isobutyl ketone and concentrated to a small volume at reduced pressure. The precipitate was collected by filtration and washed sparingly with water and anhydrous ether; yield 0.35 g., M.P. 135-145 decom: poses with prior shrinking. The infrared spectrum was consistent for 7 [D-a-(3 benzimidoylureido)phenylacetamido]-3-(1-pyridylmethyl)-3-cepheme-4-carboxylic acid betaine.
EXAMPLE 11 D oz (3 phenyl 1,2,4 oxadiazole 5 amino)phenylacetic acid: A suspension of 10.1 g. (0.0669 mole) of D-u-aminophenylacetic acid in 175 m1. of water was adjusted to pH 8.5 with aqueous sodium hydroxide (5.36 g. of sodium hydroxide in 25 ml. of water). Dioxane (150 ml.) was added followed by a solution of 12.1 g. (0.0669 mole of 5-chloro-3-phenyl-1,2,4-oxadiazole in 25 mi. of dioxane. The mixture was stirred for two hours at room temperature while being maintained at pH 8.0-8.5 by the addition of sodium hydroxide as needed. Thetheoretical amount of base was taken up and a clear yellow solution resulted. The reaction mixture was adjusted to pH 7 and the dioxane was stripped off at reduced pressure. The filtered aqueous concentrate was acidified to pH 3 (6 N hydrochloric acid) causing an oil to separate which crystallized. After cooling for one hour in an ice bath the crystalline product was filtered and air dried; weight 22.3 g. The product was recrystallized from ethyl acetate Skellysolve B and dried in vacuo at 60 for two hours; yield 17.6 g., M.P. 151154, [a] =210 (C. 0.5 ethanol). The infrared and nuclear magnetic resonance spectra were fully consistent for the desired product.
D a (3 phenyl 1,2,4 oxadiazole 5 amino)phenylacetyl chloride: A solution of 5 g. (0.017 mole) of D-a- (3-phenyl-l,2,4-oxadiazole-5amino)phenylacetic acid in 150 ml. of methylene chloride was gassed with anhydrous hydrogen chloride giving a precipitate of the hydrochloride salt. After the addition of 4.6 g. (0.022 mole) of phosphorus pentachloride the mixture was stored at room temperature for one hour giving a clear solution. The solvent was stripped off at reduced pressure. The residual oil was extracted with a mixture of Skellysolve B and carbon tetrachloride. The solvent was stripped from the extract and the residual oil was triturated once in the cold with Skellysolve B" leaving the acid chloride as an oil.
7-[D-a-(3-phenyl-l,2,4-oxadiazole 5 amino)phenylacetamido1cephalosporanic acid: A solution of D-oz-(3- phenyl-1,2,4-oxadiazole 5 amino)phenylacetyl chloride (prepared from 5 g., 0.017 mole, of the acid) in 30 ml. of acetone was added to a rapidly stirred solution of 4.62 g. (0.017 mole) of 7-aminocephalosporanic acid, 3.5 g. 01 sodium bicarbonate, ml. of water, and 70 ml. of acetone at room temperature. Additional solid sodium bicarbonate was added as needed to maintain basic pH. After stirring for one hour at room temperature the re action mixture was extracted three times with ethyl acetate (saved). The aqueous phase was acidified with 42% phosphoric acid and extracted with ethyl acetate. The ethyl acetate extract containing the product was washed three times with water, dried with sodium sulfate, filtered and concentrated to an oil which crystallized.
The combined ethyl acetate extracts which were retained above were underlayered with water, acidified with 42% phosphoric acid, and washed three times with water. The ethyl acetate phase after drying (sodium sulfate) was concentrated leaving 7-[D-a-(3-phenyl-1,2,4-oxadiazole- S-amino)phenylacetamidolcephalosporanic acid as an oil 13 which crystallized. Both fractions of product were triturated with anhydrous ether and combined; yield 2.4 g. The infrared spectrum was consistent for the desired product.
EXAMPLE 12 T N l 7-[D-a-(3-phenyl-1,2,4-oxadiazole 5 amino) phenylacetamido1-3-(1 pyridylmethyl -3-cepheme-4-carboxylic acid betaine: A suspension of 2.4 g. of 7-[D-a-(3-phenyl- 1,2,4 oxadiazole 5 amino)phenylacetamido]cephalosporanic acid in 50 ml. of water was brought into solution by adding solid sodium bicarbonate. Pyridine (2 ml.) was added and the solution adjusted to pH 6.8 with acetic acid. Potassium thiocyanate (0.4 g.) was added and the solution stirred at 50 for five hours. The cooled reaction mixture was slurried with 60 ml. of a 25% solution of Amberlite LA-l resin acetate form in methyl isobutyl ketone [Spencer et al., J. Med. Chem., 9, 746 (1966), footnote 14]. The aqueous phase was separated, washed four times with ether, filtered and concentrated to a small volume giving a precipitate of product which was filtered and washed with ether; yield 60 mg. 7-[D-ot-(3-phenyl-l,2,4- oxadiazole-S-amino)phenylacetamido] 3 (1 pyridylmethyl)-3-cepheme-4'carboxylic acid betaine M.P. 154- 160 decomp. with prior darkening. The infrared spectrum was consistent for the product.
The resin phase was extracted three times with 50-ml. portions of water. The combined aqueous extracts were washed four times with ether, filtered, and concentrated giving after washing with anhydrous ether an additional 120 mg. of product.
ILLUSTRATIVE PREPARATIONS OF STARTING REAGENTS (A) Ring-substituted 2-phenylglycines Substituted DL Z-phenylglycines are prepared by alkaline hydrolysis of the appropriate S-arylhydantoins which in turn are prepared from substituted benzaldehydes by the method of Bucherer and Leib, J. Prakt. Chem., 141, 5 (1934); for additional examples of this procedure see also U.S. Pat. 3,140,282. The substituted DL 2-phenylglycines are resolved, if desired, via their N-forrnyl derivatives as described by E. Fisher et al., Ber. 41, 1286(1908) or by one of the procedures illustrated below.
D-u-acetamidophenylacetic acid: A suspension of 50 g. (0.331 mole) of D-(-)-2-phenylglycine in 700 ml. of water was cooled to to C. and 13.2 g. (0.331 mole) of sodium hydroxide was added with stirring to produce a solution. Acetic anhydride (67.5 g., 0.662 mole) was added rapidly in one portion to the vigorously stirred solution which was initially cooled to 0 to 5 C. by means of a salt-ice cooling bath. This was immediately followed by the addition of a solution of 39.7 g. (0.993 mole) of sodium hydroxide in 200 ml. of water in a rapid stream from a dropping funnel. The temperature rose to a maximum of about 25 C. The solution was stirred for an additional fifteen minutes in the cooling bath and then acidified with concentrated hydrochloric acid. The precipitated product was collected by filtration, washed on the filter with water and recrystallized from 1:1 95% ethanolwater; yield 46.0 g. (72% M.P. l86-l88 C., M1 2l7.9 (c.==l% ethanol).
D-u-acetamido 4 nitrophenylacetic acid: D-a-acetamidophenylacetic acid g., 0.104 mole) was slowly added to 50 ml. of concentrated sulfuric acid with cooling as needed to maintain the temperature at 20 to 25 C. The mixture was stirred for about 20 minutes until most of the solid dissolved. Nitric acid d=l.5, 9.7 ml., 0.208 mole) was added dropwise at such a rate to the stirred mixture that the salt-ice cooling bath maintained the temperature in the range 0 to --5 C. The reaction mixture was stirred at 5 to l0 C. for an additional 30 minutes and then poured onto about 300 g. of ice flakes. The white crystalline product was collected by filtration, washed with water and recrystallized three times from 1: 1 ethanol-water; M.P. 182C. dec., yield 11.5 g. (46.4%). An additional recrystallization from ethyl acetate did not change the melting point; [od -206.4 (c.=5%, ethanol).
Analysis.Calcd for C H N O (percent): C, 50.42; H, 4.23; N, 11.76. Found (percent): C, 50.14; H, 407; N, 11.96.
D-a-acetamido-4-aminophenylacetic acid: A solution of 15 g. (0.063 mole) of D-a-acetamido-4-nitrophenylacetic acid in 250 ml. of 95% ethanol was hydrogenated in the presence of 0.6 g." of 5% palladium on carbon on a Paar hydrogenator at an initial pressure of 50 p.s.i. for 64 minutes. The product had crystallized from the hydrogenation mixture. Approximately 200 ml. of water was added, the mixture warmed to dissolve the product and the catalyst removed by filtration. Chilling the filtrate gave 9.9 g. of product, M.P. 192l95 C. dec. The product was recrystallized four times from 1:1 95% ethanolwater, weight 4.8 g., M.P. 207-209 C. dec., [u] 182.2 (c.=0.5%,1NHCl).
Analysis.-Cald for C H N O (percent): C, 57.71; H, 5.81; N, 13.46. Found (percent): C, 57.61, 57.64; H, 5.67; N, 13.18.
D-a-acetamido-4-iodophenylacetic acid: To a solution of 5.0 g. (0.024 mole) of D-a-acetamido-4-aminophenylacetic acid in 70 ml. of trifluoroacetic acid at 5 to 0 was added slowly 1.8 g. of sodium nitrite. The solution was stirred for 25 minutes. Solid potassium iodide (4.8 g., 0.024 mole) was added at 0 to 5. The temperature of the dark brown mixture was increased to 30 whereupon a vigorous gas evolution occurred. The mixture was maintained at 30 for 45 minutes and then heated at reflux for one-half hour. The trifluoroacetic acid phase was decanted from the dark colored insoluble material. The trifiuoroacetic acid was distilled off at reduced pressure. The residue was taken up in 50 ml. of water. After ice cooling there was obtained a precipitate of brown solid. Two recrystallizations from 1:1 95 ethanol-water gave D-a-acetamido-4-iodophenylacetic acid; M.P. 217 dec. with darkening at 202, [a] 173.2 (c.=0.5, 95% ethanol).
Analysis.Cald for C H INO (percent): C, 37.64; H, 3.16; N, 4.39. Found (percent): C, 37.84; H, 3.30; N, 4.34.
The dark colored insoluble material was slurried with water and treated with 1 M sodium thiosulfate to remove the iodine color. The solid was filtered, washed with Water and twice recrystallized from 1:1 95% ethanolwater with a carbon treatment giving additional product: M1 170.6 (c.=0.5, 95% ethanol).
Analysis.Cald for C H INO (percent): C, 37.64; H, 3.16; N, 4.39. Found (percent): C, 37.70; H, 3.25; N, 4.45.
D-u-amino-4-iodophenylacetic acid: A suspension of 3.7 g. (0.011 mole) of D-a-acetamido-4-iodophenylacetic acid in 15 ml. of 2 N hydrochloric acid plus sufficient dioxane to give a solution at the boiling point was heated at reflux for 1.5 hours. The solvent was distilled off at reduced pressure. The residue was extracted with water, the insoluble material (solid A) being removed by filtration. The filtrate was stripped to dryness at reduced pressure and the solid residue was extracted with water, the insoluble material (solid B) again removed. The filtrate was again evaporated to dryness and the residue extracted with water and the insoluble material (solid C) again removed. The filtrate was stripped to dryness giving solid D as residue. The infrared spectra (KBr) showed solids 15 A and B to be amino acid zwitter ion and solid C to be mostly amino acid hydrochloride.
Solid A was hydrolyzed in 2.5 N hydrochloric acid plus dioxane for 1.75 hours. The solution was evaporated to dryness, the residue taken up in water, a small amount of insoluble material removed 'by filtration, and the filtrate evaporated to dryness leaving solid E. An infrared spectrum (Bk) showed solid E to be a mixture of amino acid hydrochloride and zwitter ion.
Solids D and E were combined in water and the system adjusted to pH 4.5 giving 1.55 g. of D-ct-flflliIlO-4-i0d0- phenylacetic acid; M.P. 204-205 dec., (:1 -99.4 (c.=0.5, 1 N HCl).
Analysis.Cald for C H INO (percent): C, 34.68; H, 2.91; N, 5.06. Found (percent): C, 34.63; H, 3.24; N, 4.77.
D-a-amino 4 iodophenylacetic acid: D-a-acetamido phenylacetic acid (Beil. 14, 591) (200 g., 1.036 mole) was added slowly to a solution of 161.1 g. (0.52 mole) of silver sulfate in 1.2 l. of cone. sulfuric acid with cooling as needed to keep the temperature below 30. Finely pulverized iodine (684 g., 2.7 mole) was added in portions during 1.5 hours. The mixture was stirred at room temperature for 1.5 hours longer. The mixture was filtered through a sintered glass filter and the filtrate poured into ca. 3 l. of crushed ice. The solid was filtered, washed with water, and air dried. The material was recrystallized from 650 ml. of 2-propanol (the hot solution was filtered to remove some insoluble material) giving solid A; yield 46.6 g., M.P. 175-l83 dec. The filtrate was concentrated and stored in the cold overnight giving solid B; yield 132 g., M.P. 160-168 Solids A and B were crude D-a-acetamido-4-iodophenylacetic acid.
Solid B was combined with 500 ml. of 2 N hydrochloric acid and refluxed for one hour. The insoluble material (solid C) was removed by filtration and washed with water, yield 100 g., M.P. 180-183 Solid C was hydrolyzed in 200 ml. of 2 N hydrochloric acid plus enough dioxane to solubilize the material. After 2.25 hours at reflux the solvent was distilled oif at reduced pressure and the residue extracted with 250 ml. of Water. The insoluble material (solid D) was removed by filtration. The filtrate was adjusted to pH 4.5 and after cooling in an ice bath the precipitate was filtered, washed with Water, and triturated with boiling 95% ethanol giving 108 g. of D-int-amino-4-iodophenylacetic acid.
Solid A was hydrolyzed in 2 N hydrochloric acid plus dioxane for two hours and the solvent distilled 01f at reduced pressure. The residue was extracted with water. The insoluble material (solid F) was removed by filtration. The filtrate was adjusted to pH 4.5 giving crystalline D-oc- 'amino-4-iodophenylacetic acid; yield 14.4 g., [a] 86.2 (c.=0.5, 1 N HCl).
Solids D and F were combined and suspended in 350 ml. of water. The suspension was adjusted to pH 4.5 with 20% sodium hydroxide. The solid was filtered, washed with water, air dried, and triturated with 300 ml. of boiling 95% ethanol giving 42.5 g. of D-a-amino-4- iodophenylacetic acid; {od 99.8 (c.=0.5, 1 N HCl).
D-w-amino-4-iodophenylacetyl chloride hydrochloride: A suspension of 42.3 g. (0.15 mole) of finely ground D-a amino-4-iodophenylacetic acid in 1.5 l. of methylene chloride was gassed at 0 to 5 with anhydrous hydrogen chloride and 40.6 g. (0.195 mole) of phosphorus pentachloride added. The mixture was stirred for two hours at 5. S'kellysolve B (800 ml.) was added to the reaction mixture and the product collected by filtration. The product was washed with Skellysolve B and dried in vacuo; yield 40.9 g. (82%).
D-a-acetamido-3-iodophenylacetic acid: To a solution of 50.0 g. (0.24 mole) of Da-acetamido-3-aminophenyl acetic acid in 550 ml. of trifluoroacetic acid at 5 was added 17.0 g. of 97% sodium nitrite gradually during minutes. The solution was stirred at 5 for 25 minutes longer. The diazonium salt solution was added in a steady stream to a vigorously stirred suspension of 79.0 g. of potassium iodide and 2.5 g. of iodine in 300 ml. of trifiuoroacetic acid initially at 23. During the addition the temperature rose to 2527 and steady gas evolution was noted. The mixture was stirred for 3.5 hours at room tem perature until the gas evolution ceased. The reaction mixture was filtered leaving a quantity of dark gummy solid. The filtrate was concentrated to a small volume, water added, and further concentrated. The concentrate containing a solid was treated with dilute sodium thiosulfate and the solid collected by filtration. Recrystallization from 4:1 water ethanol gave 19.5 g. of D-a-acetamido-S- iodophenylacetic acid; M.P. 181-1815", [a] l58.0 (c.=0.5, 95% ethanol).
Analysis.-Calcd. for c u mo (percent): C, 37.64; H, 3.16; N, 4.39; I. 39.77. Found (percent): C, 37.80; H, 3.07; N, 4.55; I. 39.20.
D-a-amino-3-iodophenylacetic acid: 'D-u-acetamido 3- iodophenylacetic acid (10.0 g.) in 45 ml. of 2 N hydro chloric acid plus sufircient dioxane to give a solution at the boiling point was refluxed for 2.25 hours. The solvent was evaporated to dryness and the residue extracted with water. The insoluble material (solid A) was removed by filtration. The filtrate was evaporated to dryness and the residue in water was adjusted to pH 4.5 with sodium hydroxide giving 1.0 g. of D-or-amino-3-iodophenylacetic acid; M.P. 192195, [m] 81 (c.=0.5, 1 N HCl).
The filtrate deposited a second crop of amino acid on storage in the cold; yield 0.6 g., M.P. 203-2045, [al 101.4 (c.=0.5, 1 N HCl).
Solid A (which was chiefly amide) was hydrolyzed with 45 ml. 2 N hydrochloric acid plus dioxane for two hours at reflux. The residue remaining after evaporation of the solvent was combined with water and again evaporated to dryness. The residue in water was adjusted to pH 4.5 giving 1.9 g. of D-a-amino-3-iodophenylacetic acid; M.P. 19 6-199, [a] -95 (c.=0.5, 1 N HCl).
The infrared and nuclear magnetic resonance spectra of the three fractions were consistent with the desired product.
D-a-amino-S-iodophenylacetyl chloride hydrochloride: A suspension of 2.5 g. (0.009 mole) of D-a-amino-3-iodophenylacetic acid in ml. of methylene chloride at 0 to 5 was gassed with anhydrous hydrogen chloride and 2.5 g. (0.012 mole) of phosphorus pentacholride added. After stirring for 24 hours at 0 to 5 an additional 1.2 g. of phosphorus pentachloride was added and stirring continued for a total of 38 hours. The reaction mixture was diluted with Skellysolve B, the product filtered, washed wtih Skellysolve B, and dried in vacuo; yield 1.2 g.
D-( )-u-arnino-w- (3-chloro-4-hydroxyphenyl) glycine: To a stirred suspension of 5.01 g. (0.03 mole) of D-() 2-(p-hydroxyphenyl) glycine in 100 ml. of glacial acetic acid was bubbled in 1101 gas at a vigorous rate for about 5 minutes. At first a clear solution resulted and then the hydrochloride salt crystallized out. Next, 4.45 g. (0.033 mole) of sulfuryl chloride (freshly distilled) in 25 ml. of glacial acetic acid was added, with stirring, over a 30 minute period, dropwise. The temperature was 2627 C. throughout the addition. After one hour stirring, 250 ml. of dry ether was added slowly and crystallization began. After 15 min. the product was filtered oif, washed with dry ether and air dried. The 7 g. obtained was dissolved in 50 ml. of 1 N HCl, filtered, and the pH adjusted, with cooling to 5 with cone. NH OH. The resulting crystalline product was filtered 01f after 5 min. standing, washed with two 20 ml. portions of water and 5X with acetone. The vacuum dried material weighed 4.6 g.; dec. pt. 217 C. (sharp). The NMR and IR spectra were consistent with the desired structure. [041 --137.1 (c.=l%, 1 N HCl).
Analysis.--Calcd. for C H ClNO (percent): C, 47.76; i-ll, 3.601; Cl, 17.66. Found (percent): C, 47.16; H, 3.92; Cl,
d1-2-(p-methoxyphenyl)glycinez To a stirred solution of 19.6 g. (0.4 mole) of NaCN in 80 ml. of H was added 23.6 g. (0.450 mole) of NH CI and 20 ml. of conc. NH OH followed by 54.5 g. (0.4 mole) of anisaldehyde in 160 ml. of methanol and the temperature maintained at 37 C. for two hours. The methanol was then removed in vacuo and the remaining mixture extracted with two 150 ml. portions of methyl isobutyl ketone (MIBK) and combined. The combined MIBK extracts were washed once with 30 ml. of H 0 and then 240 ml. of 6 N HCl added with good mixing and the MIBK was removed in vacuo. The resulting slurry was heated at reflux (now in solution) for two hours. One hundred ml. of H 0 was added to the hot solution and then 8 g. of decolorizing carbon added and after ten minutes at gentle reflux the carbon was filtered otf and washed with 50 ml. of hot water. The combined filtrates (hot) were stirred and treated with cone. NH OH until pH 5-6 was obtained (pH paper). The slurry was then cooled to 5 C. and after one hour the crystals were filtered 01? and washed with two 100 ml. portions of water. The damp cake was then slurried in 250 ml. of water and 50% NaOH added slowly until the product dissolved. Two 300 ml. of ether extracts were then taken and discarded. The pH was then adjusted to 5.5 with 6 N HCl with cooling. After one hour the product was filtered off, washed with 3 100 ml. H 0 and air dried. Yield 40 g.; dec. 244 C. with sublimation at 230 C.
dI-Z-(p-methoxyphenyl) N (chloroacetyl) glycine: To a stirred suspension of 36 g. (0.2 mole) of dl-2-(p-methoxyphenyl)-glycine in 500 ml. of H 0 was added 8 g. (0.2 mole) of NaOH pellets and when a clear solution was obtained the solution was cooled to 5 C. and with vigorous stirring 68.2 g. (0.4 mole) of chloroacetic anhydride (warm) was added all at once. Then a solution of 16 g. (0.4 mole) of NaOH in 100 ml. of H 0 was added over a 10 to minute period. More NaOH was added as needed to keep the pH at about 9 for a 1.5 hour period. Next, the pH was adjusted to 2 with 40% H PO The product crystallized immediately and was filtered oil, washed with water and recrystallized from ethanol-water to give 38 g. of product melting at 182- 183 C.
Analysis.Calcd for C H ClNO (percent) C, 51.21; H, 4.69. Found (percent): C, 51.49; H, 4.90.
D-()-2-(p-methoxyphenyl) N chloroacetylglycine and L-(+)-2-(p-methoxyphenyl)-glycine: To 800 ml. of H 0 stirred at 37 C. was added 38 g. (0.148 mole) of dl-2- (p-methoxyphenyl-N-chloroacetylglycine and NH OH added dropwise until pH 7.8 was obtained. To the resulting solution was added 2 g. of hog kidney acylase (Sigma Chemical Company) and stirring continued at 37 C. (internal) for 21 hours. The solids containing crude L- )-2-(p-methoxyphenyl-glycine were then filtered off and washed with 2 100 ml. H 0 and the pH of the combined filtrates adjusted to 4-5 with glacial acetic acid. This solution was heated on the steam bath for 30 min. with 5 g. of decolorizing carbon and then filtered. The carbon cake was washed with 50 ml. of warm water and the combined filtrates cooled and acidified to pH 2 with 40% H PO After one hour cooling at 0 C. the crystalline product was filtered off and washed with cold water (3X) and air dried. The yield was 16 g. D-()-2-(p-methoxyphenyl)-N-chloroacetylglycine and when a second run using 5x the above amounts were used a yield of 83 g. (87% yield) was obtained. M.P. 170171 C.; [a] 193 (c.=1% ethanol).
Analysis.Calcd for C H ClNO (percent): 51.21; H, 4.69. Found (percent): C, 51.50; H, 4.99.
When the solids containing crude L-( )-2-(pmethoxyphenyl)-glycine are treated with hot 3 N HCl (200 ml.) and carbon followed by filtration and pH adjustment to 5.5 there is obtained 6 g. (first run) of pure L-(+)-2-(pmethoxyphenyl)glycine. [111 +150.4 (c.=1%, 1 N HCl).
D()-2-(p-methoxyphenyl)-glycine: The 16 g. of D- ()-2-(p-methoxyphenyl) N chloroacetylglycine was refluxed 1.5 hours in 170 ml. of 2 N HCl. The resulting clear solution was filtered and cooled at 5 C. and the pH adjusted to 5 .5 with NH OH.
The product was then filtered off after cooling 30 min. and Washed with 3X 25 ml. of cold water. The dried material D-(-)-2-(p-methoxyphenyl)-glycine weighed 9.5 g. A second run gave 54 g.
Analysis.Calcd for C H NO (percent): C, 59.67; H, 6.13; N, 7.74. Found (percent): C, 59.38; H, 6.16; N, 800.
D-( )-2-(p-hydroxyphenyl)-glycine: A mixture of 1.81 g. (0.01 mole) of D-()-2-(p-methoxyphenyl)glycine ([a] 149.9, c.=1%, 1 N HCl) and 10 ml. of 48% HBr was heated at gentle reflux for 2 hours. The resulting solution was concentrated at reduced pressure at 30 C. to a wet solid. A minimum amount of water (20 C.) was added to dissolve the HBr salt and with cooling NH OH was added to pH 5. The resulting thick gel which ppt. was warmed to 50 C. and when solution was nearly obtained a different crystalline form began to ppt. Upon cooling 30 min. at 05 C. there was obtained 990 mg. of cold water washed (3X 1 ml.) and air dried material, D-()-2-(p-hydroxyphenyl)-glycine. [011 l6l.2 (c.:1%, 1 N HCl) dec. pt. 223 C. A second run using 20x the above amounts gave 24.5 g. of material. [a] -153(c.=1%,1NHCl).
Analysis.Ca1cd for C H NO (percent): C, 57.49; H, 5.43; N, 8.39. Found (percent): C, 57.41; H, 5.67; N, 8.39.
D-(- )-2-( 3,5-dichloro-4-hydroxyphenyl) -glycine: To a stirred suspension of 5.01 g. (0.03 mole) of D-(-)-2(4- hydroxyphenyl) glycine in ml. of glacial acetic acid was bubbled in HCl gas at a vigorous rate for about 5 minutes. At first a clear solution resulted and then the hydrochloride salt crystallized out. Next, 9.0 g. (0.067 mole) of sulfuryl chloride (freshly distilled) in 25 ml. of glacial acetic acid was added, with stirring, over a 30 minute period, dropwise. The temperature was 2627 C. throughout the addition. After the sulfuryl chloride addition, the slurry was heated to 70 C. for 30 minutes and then stirred at ambient temperature for two hours. Then 250 ml. of dry ether was added slowly and crystallization began. After 15 min. the product was filtered ofl, washed with dry ether and air dried. The 7 g. obtained was dissolved in 100 ml. of 1 N HCl, filtered, and the pH adjusted, with cooling to 5 with cone. NH OH. The resulting crystalline product was filtered 01f after 5 min. standing, washed with two 20 ml. portions of Water and 5X with acetone. The vacuum dried material weighed 4.5 g.; dec. pt. 210 C. (sharp). The NMR and IR spectra were consistent with the desired structure. M1 126.3 (c.=1%,1N HCl).
Analysis.-Calcd for CaHqClgNOa (percent): C, 40.78; H, 2.99; Cl, 30.04. Found (percent): C, 41.85; H, 3.22; Cl, 27.80.
Resolution of DL-tx-amino-3-methoxyphenylacetic acid: DL-a-amino-3-methoxyphenylacetic acid [A. H. Neims, D. C. De Luca, L. Hellerman, Biochemistry, 5 (1), 203 (1966)] was resolved with d-lO-camphorsulfonic acid in water.
DL-u-amino-3-methoxyphenylacetic acid (33.1 g., 0.182 mole) was added to a solution of 46.4 g, (0.2 mole) of d-lO-camphorsulfonic acid in ml. of water at 50 to 60. The solution was filtered and stored in the cold for 20 hours. The precipitated amino acid d-lO-camphorsulfonate salt was collected by filtration. The salt was repeatedly recrystallized from water until a sample of the amino acid regenerated from it showed no further change in optical rotation. Thus, after three recrystallizations from water, there was obtained 3.7 g. of the d-IO-camphorsulfonate salt of D a amino-3-methoxyphenylacetic acid; M.P. 184-185 dec. The salt (1.4 g.) was dissolved in about ml. of water by warming. The solution was adjusted to pH 56 with concentrated ammonium hydroxide. The product was allowed to crystallize first at room temperature and then in an ice bath giving, after filtration and drying in vacuo over phosphorus pentoxide. 0.36 g. of 'D-wamino-3-methoxyphenylacetic acid; M.P. 178181 dec., [oq 129.0 (c.=0.5, 1 -N HCl). A portion of the amino acid was recrystallized from water and dried in vacuo over phosphor-us pentoxide; M.P. 180 182 dec., [M 13-6 (c.=0.08, 1 N HCl).
Analysis.-Calcd for C9H11'NO'31/3H2O (percent): C, 57.74; H, 6.28; N, 7.48. Found (percent): C, 57.70; 57.76; H, 6.23; 6.18; N, 7.21.
D-oz-amino-3-hydroxyphenylacetic acid hydrobromide monohydrate; D-u-amino 3 methoxyphenylacetic acid (2.9 g., 0.016 mole) and 16 ml. of 48% hydrobromic acid were refluxed for two hours. The volatile materials were removed at reduced pressure. Water (about ml.) was added to the residue and this removed at reduced pressure. This was repeated once. The residue was dried in vacuo to remove all water. The dried residue was recrystallized by dissolving in 2-propanol and adding Skellysolve B to the cloud point. After drying there was obtained 3.0 g. of D a amino 3 hydroxyphenylacetic acid hydrobromide monohydrate; M.P. 156- 162 dec., [uh -62 '(C.=OJ1, water). The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
Analysis.Calcd for C H NO -HBr-H O (percent): C, 36.10; H, 4.55; N, 5.26. Found (percent): C, 37.03; H, 5.12; N, 5.34.
D-u-acetamido-3nitrophenylacetic acid: A stirred suspension of 49.8 g. (0.3254 mole) of D-a-amino-3-nitrophenylacetic acid [P. Fries, K. Kjaer, Acta Chimica Scand., 17, 2391 (1963)] in 500 ml. of water was cooled in an ice bath and a solution of 8.36 g. (0.209 mole) of NaOH in 40 ml. of water was added causing most of the solid to dissolve. There was immediately added 42.7 g. (0.418 mole) of acetic anhydride followed by the addition as needed of a solution of 25.1 g. (0.627 mole) of sodium hydroxide to maintain the pH value at about 7. The reaction mixture was stirred in the ice bath for an additional 15 minutes, filtered, and adjusted to pH 1.8 with concentrated hydrochloric acid. The crystalline product was collected by filtration and washed with water; yield g., M.P. 172-174 dec. The product was twice recrystallized from !l:l 95% ethanol-water giving, after drying in lVflCUO over phosphorus pentoxide, 111.8 g. of D-a-acetamido-3-nitrophenylacetic acid, M.P. 1 83-1852 [ofl 179.4 (c.=0.5, 95% ethanol). The infrared and nuclear magnetic resonance spectra were consistent with the desired compound.
Analysis.-Calcd for C H N O (percent): C, 50.42; H, 4.23; N, 11.76. Found (percent): C, 50.56; H, 4.20; N, 11.73.
D-a-acetamido-3-aminophenylacetic acid: A solution of 9 g. (0.0378 mole) of D-u-acetamido-3-nitrophenylacetic acid in 150 ml. of methanol was hydrogenated using 0.6 g. of 5% palladium on carbon at an initial pressure of 50 p.s.i. on a Paar hydrogenation apparatus for minutes. The hydrogenation bottle was cooled with a jet of air to keep the temperature under 40. The catalyst was removed by filtration. Evaporation of the filtrate gave a crystalline product. Two recrystallizations from 1- propanol gave 3.4 g. of D-a-acetamido-3-aminophenylacetic acid, M.P. 200-201" dec.; [111 174.3 (c.=0.5 water).
Analysis.-Calcd for c rr u o, (percent): C, 57.711; H, 5.81; .N, -1-3.46. Found (percent): C, 57.78; H, 5.97; 24, 13.35.
D-u-amino-3-hydroxyphenylacetic acid: A solution of 2.1 g. (0.01 mole) of D-a-acetamido-3-aminophenylacetic acid in ml. of triduoroacetic acid was cooled to -5 and 0.69 g. (0.01 mole) of solid sodium nitrite added. After stirring for 20 minutes at 5 acetic acid (5 ml.) was added. The mixture was stirred at 45 to 50 for one and one-half hours and then heated on the steam bath for one-half hour. The cold reaction mixture was poured onto 30 g. of crushed ice. The volatile materials were distilled at reduced pressure leaving as residue at slightly brown viscous oil. The residue was combined with 30 ml. of 2 N hydrochloric acid and refluxed for one and one half hours. The volatile materials were removed under reduced pressure. Water was added to the residue and this removed under reduced pressure causing the hydrochloride salt of the product to crystallize. The residue was dissolved in a minimum amount of 'water, adjusted to pH 4.5 with 20% sodium hydroxide, filtered, and stored in the cold giving 0.43 g. of crystalline D-aamino-3-hydroxyphenylacetic acid, M.P. 204-206 dec. The filtrate was stripped to dryness and a small amount of water added to the crystalline residue giving a 2nd crop (0.46 g.) of the amino acid.
The filtrate from the 2nd crop plus 3 ml. of concentrated hydrochloric acid were concentrated to dryness. The cooling gave crystalline :D-ot-arnino-3-hydroxyphenylacetic acid hydrochloride monohydrate; yield 0.5 g., M.P. 150153 dec., [ab -91.2 (c.-=0.5, water). The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
Analysis.Calcd for C H NO -HCl-H O (percent): C, 43.35; H, 5.46; .N, 6.32. Found (percent): C, 42.7; H, 5.6; N, 6.17; residue, 1.45.
Values corrected for 1.45% residue: C, 43.3; H, 5.7; N, 6.26.
The two crops of D-a-amino-3-hydroxyphenylacetic acid were combined, suspended in a small amount of water, 2 ml. of 48% hydrobromic acid added and the liltered solution evaporated to dryness. The residue was twice recrystallized from water giving 150 mg. of 'D-aamino-3-hydroxyphenylacetic acid hydrobromide monohydrate; M.P. 17'2175 dec., M1 -74 (c.=0.1, Water). The infrared and nuclear magnetic resonance spectra were consistent with the assigned structure.
Analysis.-Calcd for C H NOyHBr-H O (percent): C, 36.10; H, 4.55; N, 5.26. Found (percent): C, 36.20; H, 4.62; N, 5.32.
D-a-amino-3-hydroxyphenylacetic acid: A solution of 38.4 g. (0.1845 mole) of D-a-acetamido-3-aminophenylacetic acid in 600 ml. of trifiuoroacetic acid prepared at 15 to 20 was cooled to 5 and 13 g. (0.1845 mole) of 98% sodium nitrite added in portions during a 10-minute period with stirring at 5. After stirring for an additional 25 minutes ml. of acetic acid was added at 5 to 0. The mixture was heated at 45 to 50 for one and one-half hours (gas evolution) refluxed for one-half hour, cooled, and poured onto 500 g. of ice flakes. The volatile materials were removed at reduced pressure. The residue was refluxed with 400 ml. of 2 N hydrochloric acid for one hour. Concentration to a small volume gave the crystalline hydrochloride salt. The dried product (27 g.) was recrystallized from Wet acetic acid ml. acetic acid plus 7 ml. of water) giving 21 g. of D-e-arnino-3-hydroxyphenylacetic acid hydrochloride monohydrate; M.P. 149-- 152 dec., [11],; 103.0 (c.=0.5, water).
D-a-amino-4-acetamidophenylaceticacid: D-a-acetamido 4-aminophenylacetic acid (39.2 g., 0.188 mole) in 400 ml. of 2 N hydrochloric acid was refluxed for two hours. The mixture was concentrated to dryness at reduced pressure. Water was added and the solution again concentrated to dryness. This was repeated once. The crystalline residue was slurried with 2-propanol, filtered, and washed additionally with 2-propanol giving, after air drying, 47 g. of the hydrochloride of D-a-amino-4-amino phenylacetic acid.
Ten g. of the hydrochloride in 40 ml. of water was adjusted to pH 4.8 with 20% sodium hydroxide. Crystalline D-a-amino-4-aminophenylacetic acid separated. To the solution obtained by adding 160 ml. additional of water was added ml. of thioacetic acid. The mixture was stirred for 17 hours at 24 under a nitrogen atmosphere. The reaction mixture, containing a quantity of crystalline product, was concentrated to one-half of its initial volume giving 4.5 g., of product. The crude product was suspended in water, the suspension adjusted to pH 4.6 with NaOH, heated to 95, carbon treated, and the product allowed to crystallize in the cold overnight. The resulting gelatinous mass was broken up by warming. The solid was removed by filtration, wt. 0.2 g., M.P. 203-206 dec. The filtrate was diluted with an equal volume of 95% ethanol giving 1.4 g. of D-a-amino-4-acetamidophenylacetic acid; M.P. 2l4-2l5 dec., [0415 Q l33.4 (c.: 0.5, 1 N HCl).
Analysis.-Calcd for C H N O (percent): C, 57.71; H, 5.814; N, 13.46. Found (percent): C, 56.80, 56.72; H, 5.84, 5.89;N, 13.62; E 0, 1.32.
Found values corrected for 1.32% water: C, 57.52; H, 5.71; N, 13.80.
D-a-amino-3-aminophenylacetic acid: A solution of 9.8 g. (0.05 mole) of D-a-amino-3-nitrophenylacetic acid [P. Friis and A. Kjaer, Acta Chimica Scand. 17, 2391 (1963 British Patent Specification, 1,033,257] in 200 ml. of water was prepared by adjusting the mixture to pH 9.3 with concentrated ammonium hydroxide. The solution was hydrogenated for 1 hour in the presence of 0.4 g. of 5% palladium on carbon on a Paar hydrogenation apparatus at an initial pressure of 50 p.s.i. The vessel was cooled as needed to keep the temperature from going above After 1 hour an additional 0.4 g. of catalyst was added and hydrogenation continued for 1 hour longer. Three additional runs were made hydrogenating a total of 39.4 g. of nitro compound. Addition of the second amount of catalyst was omitted in the additional runs and a hydrogenation time of about 1 hour was used. Each run was filtered to remove catalyst, the filtrates pooled and concentrated to a small volume until crystallization of the product started. The concentrate was diluted with about five volumes of 95% ethanol, the mixture stored overnight in the cold and the product filtered and washed further by slurrying with 95% ethanol. After drying in a vacuum oven for 3 hours at and then in vacuo over phosphorus pentoxide for 64 hours there was obtained 25.7 g. of' D-a-amino-3-aminophenylacetic acid; M.P. 188- 19l, [a] 139.0 (c.=1 in HCl).
The preparation of this compound has been described by P. Friis and A. Kjaer, Acta Chimica Scand. 17, 2391 (1963).
D-a-amino-3-acetamidophenylacetic acid: A mixture of 5 g. (0.0301 mole) of D-a-amino-3-aminophenylacetic acid and 5 ml. of thioacetic acid in 100 ml. of water was stirred for 16 hours under a nitrogen atmosphere. The mixture was heated on a steam bath for one-half hour and then concentrated at reduced pressure to a small volume. On cooling the concentrate the product started to crystallize. The concentrate was diluted with 95% ethanol and, after chilling in an ice bath, the product was filtered and washed with 95% ethanol; wt. 1.8 g. The filtrate was further diluted with 95 ethanol giving an additional 2.3 g. of product. The two crops of product were combined, dissolved in a small amount of water by warming, the solution concentrated slightly and diluted with a large volume of 95% ethanol. The initial crop of solid was removed by filtration and the filtrate stored in the cold for 16 hours giving, after drying at 65 for 3 hours in vacuo over phosphorus pentoxide, 0.90 g. of product, M.P. 185187 dec. The product was twice recrystallized from 1:1 ethanol-water; wt. 0.36 g., M.P. l86-l87 dec., [a1 (c.=0.5, 1 N HCl).
Analysis.Calcd for C H N O (percent): C, 57.7; H, 5.81; N, 13.5. Found (percent): C, 47.29; H, 6.79; H, 11.21; H O, 18.3.
Found values corrected for 18.3% water: C, 57.9; H, 5.83; N, 13.7.
DL-tx-amino-3-chlorophenylacetic acid: A solution of 250 g. of rn-chlorobenzaldehyde in 1.5 l. of 95% ethanol was added in one portion to a stirred solution of 123 g. of sodium cyanide, 515 g. of ammonium carbonate and 1.5 l. of water. The mixture was stirred at 50 for 120 hours. The cooled reaction mixture was acidified to pH 2 with concentrated hydrochloric acid and stirred one hour. The hydantoin was collected by filtration, washed with cold water, and sucked dry on the filter.
The mixture of the crude hydantoin obtained from two runs and 4 l. of 10% sodium hydroxide was refluxed for 18 hours. The solution was carbon treated and neutralized to pH 7 with acetic acid. The solid was collected by filtration, washed with water, and dried on the filter. A suspension of the product in 4 l. of water was acidified to pH 2 with concentrated hydrochloric acid. After stirring for 1.5 hours the insoluble material was removed by filtration and the filtrate adjusted to pH 7 with 10% sodium hydroxide. The precipitate was collected by filtration and dried in vacuo at 75 for 18 hours giving 311 g. of DL-ot-amino-3-chlorophenylacetic acid; M.P. 266-269 dec.
DL-u-formamido-3-chlorophenylacetic acid: To 100 g. of DL-ot-amino-3-chlorophenylacetic acid was added 1.33 l. of formic acid. The reaction mixture was warmed to 50 and 483 ml. of acetic anhydride was added dropwise. After storage overnight the DL-a-formamido 3-chlorophenylacetic acid was collected by filtration and washed with water; yield 97 g.
D-()-cc-tl11lll0 3 chlorophenylacetic acid: oc-FOIIII- amio-3-chlorophenylacetic acid (721 g.) and one kg. of dehydroabietylamine were combined in 4.1 of methanol. After storing in the cold for two hours the crystalline salt was collected by filtration. The product was recrystallized from methanol-Water; yield 598 g., [a] 225 (c.:0.4, methanol). The salt was slurried in 2 l. of methanol and 2 liters of saturated sodium bicarbonate solution. The mixture was diluted with 2 l. of water, layered with methyl isobutyl ketone, and stirred vigorously. The aqueous phase was separated and acidified to pH 2 with cone. hydrochloric acid. The acid was collected by filtration and dried. The dried product was combined with 2 l. of 6 N hydrochloric acid and 750 ml. of methanol, the mixture heated for two hours, and filtered. The solution was adjusted to pH 5 with ammonium hydroxide. The solid was collected by filtration and washed with Water and acetone giving 112 g. of D- ()-lX-amlI1O3- chlorophenylacetic acid; [a] (c.=0.4, 1 N HCl).
D-(-)-a-amino 3 chlorophenylacetyl chloride hydrochloride: To a stirred suspension of 25 g. of D-()- a-amino-3-chlorophenylacetic acid in 375 ml. of methylene chloride at 2 was added 36.5 g. of phosphorus pentachloride. After stirring at 0 to 2 for one and one-half hours the product D-()- x-amino-3-chlorophenylacetyl chloride hydrochloride was collected by filtration, washed with methylene chloride and Skellysolve B, and dried in vacuo to constant weight; yield 17.0 g.
DL-u-amino-3-fiuorophenylacetic acid: To a stirred solution of 24.5 g. of sodium cyanide, 29.5 g. of ammonium chloride, 25 ml. of ammonium hydroxide and 100 ml. of water at room temperature was added a solution of 62.0 g. of m-fluorobenzaldehyde in 200 ml. of methanol. The mixture was stirred at 38 for two hours. The methanol was stripped off at reduced pressure. The residue was extracted with two by 200-ml. portions of ethyl acetate. The combined extracts were washed with water. To the ethyl acetate phase was added dropwise with vigorous stirring 50 ml. of 6 N hydrochloric acid at room temperature. The solution was put under vacuum (water aspirator) and 250 ml. of 6 N hydrochloric acid added dropwise. The mixture was refluxed for 2.5 hours, stirred for 13 hours, and adjusted to pH 4.8 with concentrated ammonium hydroxide while cooling in an ice bath. The aqueous phase was decanted and the gummy precipitate triturated with water and ethyl acetate. The product DL-a-arnino-3-fiuorophenylacetic acid was collected by filtration and dried in vacuo over phosphorus pentoxide; yield 8.6 g., M.P. 200-203 (sublimation). A second crop of product separated from the filtrates; yield 2.0 g., M.P. 245-250 (sublimation).
DL-a-foramido-3-fiuorophenylacetic acid: A partial solution of 35 g. of DL-u-amind3-fluoropheny1acetic acid in 356 ml. of 88% formic acid was heated to 50 and 119 ml. of acetic anhydride added dropwise. The mixture was stirredfor 17 hours at 5060 and cooled. The product, DL-a-formamido-3-fiuorophenylacetic acid, was collected by filtration and dried in vacuo; yield 38.5 g M.P. 207-209" dec.
D-u-formamido-3-fiuorophenylacetic acid: To a solution of 20 g. of DL-u-formarnido-3-fiuorophenylacetic acid in 4 l. of pH 7 phosphate buffer was added 3.0 g. of hog kidney D-amino acid oxidase (Nutritional Biochemicals Corp.). The mixture was stored at 37 for 19.5 hours, adjusted to pH 5.0 with acetic acid, 5 g. of carbon added, heated to 60 for one-half hour and filtered. The filtrate was adjusted to pH 2 with 40% phosphoric acid and extracted with ethyl acetate. The ethyl acetate extract was washed wih water and stripped to dryness giving 10.0 g. of product; M.P. 190192, [vd -l6l.0 (c.'=1.0 methanol). The product was again treated with hog kidney D-amino acid oxidase (1 g.) in 500 ml. of pH 7 phosphate butter and the product worked up as above. There was obtained after recrystallization of the product from methanol 5.7 g. of D-ix-formamido-li-fiuorophenylacetic acid; [a] l78.0 (c.=1.0, methanol).
D-ot-amino-B-fluorophenylacetic acid: A suspension of D-a-formamido-ii-fiuorophenylacetic acid (9.48 g.) in 100 ml. of 6 N hydrochloric acid was refluxed for one-half hour. The reaction mixture was cooled in an ice bath, filtered, and adjusted to pH 3.8 with concentrated ammonium hydroxide. After stirring for 10 minutes the product, D-ot-amino-3-fluorophenylacetic acid, was collected by filtration and dried in vacuo over phosphorus pentoxide; yield 6.63 g., [od -110 (c.=1.0, 1 N hydrochloric acid), M.P. 249250.
Additional information is given concerning the synthesis of ring-substituted 2-phenylglycines by Doyle et al., J. Chem. Soc., 1440 (1962) and Ryan et al., J. Med. Chem., 12, 310-313 (1969). As stated by Ryan et al. such amino acids are converted into N-tbutoxycarbonyl derivatives by the method of Schwyzer et al., Helv. Chim. Acta, 42, 2622 (1959); Ryan et al. also give an illustrative example of the resolution of such a derivative by the use of cinchonine.
(B) Ring-substituted cephaloglycins with and without blocked a-amino groups D-()-a-(3-chloror4-hydroxyphenyl) a (t-butoxycarbonylamino)-acetic acid: To a stirred suspension of 4.0 g. (0.02 mole) of D-()-2-(3-chloro-4-hydroxyphenyl) glycine (finely ground) and 1.6 g. (0.04 mole) of powdered magnesium oxide in 50 ml. of 1:1 dioxanewater was added 5.8 g. (0.04 mole) of t-butoxycarbonylazide (Aldrich Chemical Company Inc.) over a 30 minute period and then stirring continued for hours at 45 50 C. The resulting turbid solution was then poured into one liter of ice water with stirring. One 600 ml. ethyl acetate extract was taken and this was washed twice with, 200 ml. portions of 5% sodium bicarbonate and these aqueous solutions combined and filtered. Next, with cooling, they were acidified to pH 3 with 40% phosphoric acid under a layer of 500 ml. of ethyl acetate. This ethyl acetate extract was separated and combined with two more 100 ml. ethyl acetate extracts and dried over sodium sulfate. The ethyl acetate solution was then filtered and concentrated under reduced pressure to an oil and 100 ml. of warm benzene added. The resulting solution was filtered. After removing the solvent in vacuo there was obtained 6 g. as an amorphous froth of:
D()-oc-(3-ChlOI0 4 hydroxyphenyD-a-(t-butoxycarbonylamino)-acetic acid. Infrared and NMR analysis revealed only the NH group had reacted with the azide.
7-[D-u-(t-butoxycarbonylamino) a (3-chloro-4-hydroxyphenyl) 'acetamido]cephalosporanic acid: To a stirred solution of 4.03 g. (0.02 mole) of D-()-a-(3- chloro-4-hydroxyphenyl) a (t-butoxycarbonylamino)- acetic acid, 2.8 ml. of triethylamine (0.02 mole) in 100 ml. of tetrahydrofuran, was added 3.64 g. (0.02 mole) of trichloroacetyl chloride in 25 ml. of tetrahydrofuran over a 10 min. period at 40 C. (internal). After an additional 10 min. at 40 C., a pre-cooled solution at 50 C. of 5.44 g. (0.02 mole) of 7-ACA, 5.6 ml. (0.04 mole) of triethylarnine in 300 ml. of CH Cl was added all at once. The temperature was maintained at -40 C. to 30 C. for 30 min. and then the cooling bath was removed and after another 30 min. (T max. 0 C.) the solvent was removed in vacuo at 20 C. The residue was taken up in 150 ml. of H 0 and 150 ml. of ether. The ether layer was discarded and the aqueous layered with 150 ml. of ethyl acetate and cooled and stirred while being :acidified to pH 2.5. The ethyl acetate extract was washed with water, dried 10 min. over Na SO filtered and conc. to an oil at 20 C. under reduced pressure. The oil was triturated until a solid ppt. with two 200 ml. portions of 1:1 by volume dry ether Skellysol ve B (pet. ether). The solids were filtered oil and vacuum dried over P 0 The yield was 7.4 g. dec. pt. 100 C., slowly. The IR and NMR were consistent with the desired structure.
Analysis.-Calcd for C H ClN O S (percent): C, 49.64; H, 4.71. Found (percent): C, 49.50; H, 5.48.
7-[D-a-amino-a-(3-chloro 4 hydroxyphenyl)-acetamidoJ-cephalosporanic acid: A solution of 7 g. of 7-[D- a-(t-butoxycarbonylamino)-a-(3 chloro 4 hydroxyphenyl)-acetarnido]-cephalosporanic acid in 200 ml. of 50% aqueous formic acid was stirred and heated at 40 C. for 3 hours and then the solvents removed in vacuo at 20 C. to leave a glass-like residue. This was further dried by adding 200 ml. of toluene and removing same under reduced pressure at 20 C. The residue was stirred with moist ethyl acetate until solid and the solids filtered 01f. Next, the solids were stirred with ethanol (200 ml.) for one hour and filtered. There was obtained 2.5 g. of vacuum dried material. This was further purified and crystallized by stirring for 2 hours in a mixture of 12 ml. H 0 and 12 ml. of Amberlite LA1 resin (acetate form) 25% in methyl isobutyl ketone (MIBK). The product was filtered off, Washed with a little MIBKH O (1:1) and finally washed with acetone. The final yield was 450 mg. dec. C. slowly. The IR and NMR were consistent with the desired structure.
Arzalysis.-Calcd for C13H13C1N30'7S (percent): C, 47.37; H, 3.94. Found (percent): C, 47.33; H, 4.98.
Amberlite LA-l is a high molecular weight, waterinsoluble, liquid secondary amine, commercially available from Rohm and Haas Co. The acct-ate form used in this investigation was prepared as follows. To 1.0 l. of Amberlite LA-l and 3.0 l. of isobutyl methyl ketone was added ml. of glacial acetic acid and the solution was stirred for 5 min. After stirring with 800 ml. of water for 25 min. the organic layer was separated for use.
More precisely, Amberlite IA-l is a mixture of secondary amines wherein each secondary amine has the wherein each of R R and R is an aliphatic hydrocarbon radical and wherein R R and R contain in the aggregate from 11 to 14 carbon atoms; this particular mixture of secondary amines, which is sometimes referred to in the following examples as Liquid Amine Mixture No.
25 I, is a clear amber liquid having the following physical characteristics: viscosity at 25 C. of 70 cps.; specific gravity at 20 C. of 0.845; refractive index at 25 C. of 1.467; distillation range at 10 mm.: up to 160 C.4%, 160 to 210 C.%, 210 to 220 C.-74%, above 220 C.17%.
D a (p-hydroxyphenyl)-a-(t-butoxycarbonylamino)acetic acid: To a stirred suspension of 8.35 g. (0.05 mole) of D-() 2 (p-hydroxyphenyl)glycerine (finely ground) and 8 g. (0.2 mole) of powdered magnesium oxide in 225 ml. of 1:1 dioxane-water was added 14.3 g. (0.10 mole) of t-butoxycarbonylazide (Aldrich Chemical Company Inc.) over a 30 minute period and then stirring continued for 20 hours at 45 50 C. The resulting turbid solution was then poured into one liter of ice water with stirring. One 600 m1. ethyl acetate extract was taken and this was washed twice with 200 ml. portions of 5% sodium bicarbonate and these aqueous solutions combined and filtered. Next, with cooling, they were acidified to pH 3 with 40% phosphoric acid under a layer of 500 ml. of ethyl acetate. This ethyl acetate extract was separated and combined with two more 100 ml. ethyl acetate extracts and dried over sodium sulfate. The ethyl acetate solution was then filtered and concentrated under reduced pressure to an oil and 100 ml. of warm benzene added. The resulting solution was filtered and scratched. There was obtained 10.8 g. of crystalline material, D a- (p-hydroxyphenyl -u-t-butoxycarbonylamino)acetic acid. Infrared and NMR analysis revealed only the NH group had reacted with the azide.
Analysis.Calcd for C H NO (percent): C, 58.43; H, 6.48; N, 5.25. Found (percent): C,62,46; H, 6.55; N, 4.56.
7-[D-ot-(t-butoxycarbonylamino) a (p-hydroxyphenyl)-acetamido]cephalosporanic acid: (A) To a stirred solution of 5.35 g. (0.02 mole) of D-()-a-(p-hydroxyphenyl)-a-(t-butoxycarbonylamino)acetic acid, 2.02 g. (0.02 mole) of 2,6-lutidine and 50 ml. of tetrahydrofuran at 10 C. was added all at once 2.16 g. (0.02 mole) of ethyl chloroformate. After minutes an ice cold solution of 5.44 g. (0.02 mole) of 7-aminocephalosporanic acid and 5 g. of sodium bicarbonate in 50 ml. of water was added, all at once with vigorous stirring. The temperature was kept at or below 0 C. for 10 minutes and between 0 C. and +10 C. for 90 minutes. Next, 100 ml. of water was added and the tetrahydrofuran removed in vacuo at 20 C. One 200 ml. ether extract was taken and discarded. The aqueous phase was layered with 200 ml. of methyl isobutyl ketone and cooled and stirred while being acidified to pH 2. The methyl isobutyl ketone layer was washed with two 100 ml. portions of water, dried briefly over sodium sulfate, filtered and treated with 7 ml. (0.2 mole) of 50% NaEH (Sodium Z-ethylhexanoate in n-butanol). An oily precipitate separated and slowly crystallized. After one hour, the crystals were collected, washed with methyl isobutyl ketone and air dried. After further drying over phosphorus pentoxide (vacuum) there was obtained 5.24 g. dec. slowly above 100 C. The infrared and NMR spectra were consistent with the structure of sodium 7-[D-a-(butoxycarbonylaminoya-(p-hydroxyphenyl) -acetamido cephalosporanate.
The free acid 7-[D-a-(t-butoxycarbonylamino)-a-(phydroxyphenyl)-acetamido]cephalosporanic acid was obtained as an amorphous gum by extracting an acidic aqueous solution with ethyl acetate and concentrating under reduced pressure.
(B) (Alternate procedure).To a stirred solution of 5.35 g. (0.02 mole) of D-()-ix-(p-hydroxyphenyl)-a- (t-butoxycarbonylamino)acetic acid, 100 ml. of tetrahydrofuran, and 2.8 ml. (0.02 mole) of triethylamine at 40 C. was added dropwise 3.64 g. (0.02 mole) of trichloroacetic acid in ml. of tetrahydrofuran over a 20 minute period. Next, after an additional 15 minutes a solution of 5.44 g. (0.02 mole) of l-aminocephalosporanic acid and 5.6 ml. (0.04 mole) of triethylamine in 300 m1. of methylene chloride precooled to -40 C. was added all at once and the temperature maintained at -40 C. to -30 C. for minutes. The mixture was then concentrated under reduced pressure at 20 C. to an oil. This was taken up in 200 ml. of 2% aqueous sodium bicarbonate and 200 ml. of ether. The ether layer was discarded and the aqueous phase layered with 200 ml. of ethyl acetate and, with cooling and stirring, the mixture acidified to pH 3. The ethyl acetate layer was then separated and washed twice with water, dried briefly over sodium sulfate, filtered and evaporated to an oil under reduced pressure at 20 C. Five hundred ml. of ether was then added and a small amount of insoluble material filtered off. The ether solution was then concentrated to about 200 ml. and then 200 ml. of Skellysolve B (petroleum ether) was added. The precipitate which formed was separated by filtration and consisted of the desired product, 7 [D-ct-(t-butoxycarbonylamino)-u-(p-hydroxyphenyD-acetamindo]cephalosporanic 'acid. Yield=6 g.
7- [D-a-amino-wQJ-hydroxyphenyl) acetamido1cephalosporanic acid: 7- [D-a- (t-butoxycarbonylamino -oc- (p-hydroxyphenyl)acetamido]cephalosporanic acid (6 g.) was dissolved in 100 ml. of aqueous formic acid and stirred at 40 C. for 3 hours. The solution was then treated with 1 g. of decolorizing carbon and filtered. The filtrate was concentrated to a viscous oil at 20 C. under reduced pressure. The last traces of formic acid were removed by adding 300 ml. of toluene and removing same under reduced pressure at 20 C. The resulting glass was triturated with 400 ml. of ethyl acetate to which 5 ml. of water had been added. A semi-crystalline solid formed which was filtered off and vacuum dried over phosphorus pentoxide. The product, 7-[D-a-amino-a-(phydroxyphenyl)-acetamido]cephalosporanic acid, Weighed 1.8 g. and had a decomposition point of 260 C. with darkening above 150 C. Infrared and NMR spectra were consistent with the structure.
Analysis.Calcd for C13H19N3O7S (percent): C, 51.07; N, 4.55. Found (percent): C, 51.58; H, 5.12.
D-()-u=benzyloxycarbonylamino or (4-benzyloxycarbonyloxyphenyl)-acetic acid: To a stirred suspension of 5.01 g. (0.03 mole) of D-()-2-(p-hydroxyphenyl) glycine in ml. of water at 22 C. (room temperature) was added 1.2 g. (0.03 mole) of sodium hydroxide pellets. A clear solution resulted. The stirred solution was cooled to 0 C. and 2.4 g. (0.06 mole) of NaOH pellets were added. When they had dissolved 13.6 g. (0.08 mole) of carbobenzoxy chloride was added all at once with vigorous stirring. After 30 minutes at 0 C. to 5 C. the pH was 7 and a few drops of 50% NaOHH O was added to keep the pH at 89 during another 30 minutes. Three hundred ml. of H 0 was then added and the resulting slurry was transferred to a separatory funnel and 500 ml. of ether added. After shaking, the ether layer was discarded and the aqueous layer and solids combined with 300 ml. of ethyl acetate and the mixture acidified with shaking to pH 2 with 6 N HCl. The ethyl acetate phase was combined with two more ethyl acetate extracts and washed with two 100 ml. portions of water, two 300 ml. portions of saturated Na S0 solution and filtered. Upon concentrating under reduced pressure to an oil the product crystallized. The material was recrystallized from benzene-Skellysolve B (pet. ether) to give 8.9 g. of D- ()-a-benzyloxycarbony1amino oc- (4-benzyloxycarbonyloxyphenyl)-acetic acid with a melting point of 101- 102 C.
Analysis.Calcd for C H NO (percent): C, 66.21; H, 4.88; N 3.22. Found (percent): C, 67.93; H, 5.24; N, 3.07.
7-[D u amino a (p-hydroxyphenyl) acetamido] cephalosporanic acid: D-( )-a-benzyloxycarbonylaminoa (4 benzyloxycarbonyloxyphenyl)acetic acid (0.344 mole) is dissolved in 100 mls. of dimethylformamide. There is then added 2,6-litidine (3.7 gms.; 0.0244 mole) and the solution is cooled to 5 C. in an ice bath. Ethyl chlorofor-mate (3.72 gms.; 0.0344 mole) is added to the cool solution over a period of five minutes. The mixture is stirred for 15 minutes and a solution of 7-aminocepl1- alosporanic acid (0.395 mole) in 70 ml. of water and 20 ml. of 2,6-lutidine is added. The solution is stirred in the ice bath for 15 minutes, diluted with 500 ml. of water and extracted twice with ether. The ether extract is discarded. The pH of the solution is lowered to 2 by the addition of dilute H 80 and the product is extracted into ether. The ether extract is washed with water and the product is extracted into dilute Na CO This extract has a pH of 7.5 and a volume of about 300 mls. It is then shaken with 7 gms. of 30% palladium on Celite for 20 minutes under an atmosphere of hydrogen at a pressure of 50 p.s.i. The volume of the solution is doubled by the addition of water and the pH is lowered to 2 by the addition of dilute H SO The catalyst is then removed by filtration and the filtrate is extracted with a mixture of 150 mls. of methyl isobutyl ketone and 8 gms. of Aerosol OT. The extract is dried over anhydrous Na S O and neutralized to pH 4.5 by the addition of triethylamine and an amorphous solid is collected by filtration and slurried with 20 mls. of water. A crystalline solid is formed which is collected and dried in vacuo over P This product, 7-[D-a-amino-a-(p-hydroxyphenyl)-acetamido]cephalosporanic acid, is found to contain the fl-lactam structure as shown by infrared analysis.
Celite is diatomaceous earth. Aerosol OT is dioctyl sodium sulfosuccinate.
D-a-t-butoxycarboxamido 4 acetamidophenylacetic acid: A mixture of D-a-amino-4-acetamidophenylacetic acid (0.0205 mole), 3.2 g. (0.022 mole) of t-butoxycarbonyl azide, 1.65 g. (0.041 mole) of magnesium oxide and 100 ml. of 50% aqueous dioxane was stirred for 20 hours under a nitrogen atmosphere. The reaction mixture was poured into 400 ml. of ice water plus 300 ml. of ethyl acetate. The ethyl acetate phase was twice extracted with dilute aqueous sodium bicarbonate solution, the extracts being combined with the aqueous phase. The aqueous phase was acidified to pH 4 with 42% phosphoric acid and extracted with five 100-ml. portions of ethyl acetate. The combined and dried (sodium sulfate) ethyl acetate extract was stripped of solvent at reduced pressure. A solution of the residue in a minimum amount of chloroform was added to a large volume of Skellysolve B (petroleum solvent B.P. 60-68 C., essentially n-hexane) to yield 5.6 g. of D-ot-t-butoxycarboxamido- 4-acetamidophenylacetic acid as an amorphous solid. The infrared and nuclear magnetic resonance (NMR) spectra were consistent with the desired product.
7 (D-a-amino-4-acetamidophenylacetamido)-cephalosporanic acid: A solution of 5.6 g. (0.0182 mole) of D-a-t-butoxycarboxamido 4 acetamidophenylacetic acid and 2.58 ml. (0.0182 mole) of triethylamine in 50 ml. of tetrahydrofuran was cooled to 45 C. (crystallization) and 2.04 ml. (0.0182 mole) of trichloroacetyl chloride was added dropwise during 5 minutes at 45 C. After stirring for 10 minutes a cold (50") filtered solution of 4.96 g. (0.0182 mole) of 7-aminocephalosporanic acid and 5.1 ml. (0.0364 mole) of triethylamine in 250 ml. of methylene chloride was added in one portion. The reaction mixture was stirred at 45 C. for one-half hour, then the cooling bath was removed and the temperature allowed to rise to 0. The solvent was removed at reduced pressure. Water and ether were added to the residue. The ether phase was extracted once with aqueous sodium bicarbonate solution and the extract combined with the aqueous phase. The aqueous solution was acidified with 42% phosphoric acid and extracted twice with ethyl acetate. The combined ethyl acetate extracts were twice Washed with water, dried over anhydrous sodium sulfate and the solvent removed at reduced pressure. Trituration of the residue gave a solid which was dissolved in chloroform. Crystalline 7-(D-oc-t-butoxycarboxamido 4 acetamidophenylacetamido)cephalosporanic acid separated; weight 2.6 g.
7 (D;a-t-butoxycarboxamido 4 acetamidophenylacetamido)-cephalosporanic acid (2.45 g.) was added to 74 ml. of 45% aqueous formic acid and the solution was stirred at 40 for 3 hours. The water and formic acid were distilled olf at reduced pressure, toluene finally being added and distilled off to remove any remaining water and formic acid. The residue was triturated with wet ethyl acetate, concentrated somewhat to remove water, finally more ethyl acetate was added giving a filterable solid. The solid was triturated with 95% ethanol yielding, after drying in vacuo over phosphorus pentoxide, 1.4 g. of 7-(D-a-amino-4 acetamidophenylacetamido) cephalosporanic acid. The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
D-a-t-butoxycarboxamido 3 acetarnidophenylacetic acid: D-a-amino 3 acetamidophenylacetic acid (6.9 g., 0.0331 mole), 2.67 g. (0.0662 mole) of magnesium oxide and 5.23 g. (0.0365 mole) of t-butoxycarbonyl azide were combined in 84 ml. of 50% aqueous dioxane. After 15 minutes of stirring, an additional 40 m1. of 50% aqueous dioxane was added. The mixture was stirred at 45 to 50 for 24 hours. The reaction mixture was poured into 400 ml. of cold water, plus 300 ml. of ethyl acetate; the whole was then filtered to remove a small amount of insoluble material. The ethyl acetate phase was once extracted with dilute aqueous sodium bicarbonate and this combined with the aqueous phase. The cold aqueous solution was adjusted to pH 4 with 42% phosphoric acid and extracted with ethyl acetate. The ethyl acetate extract was washed three times with water, dried with anhydrous sodium sulfate and stripped of solvent at reduced pressure. The residue was dissolved in anhydrous ether and diluted with Skellysolve B giving 5.9 g. of D-a-t-butoxycarboxamido 3 acetamidophenylacetic acid as an amorphous solid. The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
7 (D-zx-t-butoxycarboxamido 3 acetamidophenylacetamido)cephalosporanic acid: A cold (0 to 5 C.) solution of 4.86 g. (0.0178 mole) of 7 aminocephalosporanic acid and 2.5 ml. (0.0178 mole) of triethylamine in 2.5 ml. of water plus 25 ml. of tetrahydrofuran was added in one portion to the vigorously stirred mixed anhydride prepared from 5.5 g. (0.0178 mole) of D-a-tbutoxycarboxamido 3 acetamidophenylacetic acid, 2.5 ml. (0.0178 mole) of triethylamine and 1.7 ml. (0.018 mole) of ethyl chloroformate in 75 ml. of tetrahydrofuran at 8 to -10 C. The mixture was stirred at about -8 C. for 50 minutes then the cooling bath was removed and the mixture was stirred for 10 minutes. An additional 30 ml. of water was added. Most of the tetrahydrofuran was removed at reduced pressure. The aqueous concentrate was extracted three times with ethyl acetate, the ethyl acetate extracts being discarded. The aqueous phase was acidified with 42% phosphoric acid and extracted three times with ethyl acetate. A small amount of insoluble material was removed by filtration during the first extraction. The combined ethyl acetate extracts were dried with anhydrous sodium sulfate, the solvent removed at reduced pressure and the residue triturated with anhydrous ether giving 6.2 g. of 7-(D-a-t-bIJtOXY- carboxamido 3 acetamidophenylacetamido)cephalosporanic acid as an amorphous solid. The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
7 (D-u-amino-3acetamidophenylacetamido)cephalosporanic acid: Six g. of 7 (D-u-t-butoxycarboxarnido-3- acetamidophenylacetamido)cephalosporanic added to l ml. of 44% aqueous formic acid. At first a solution was obtained and then a crystalline solid Separated accompanied by gas evolution. The reaction mixture was stirred at 39 to 40 for 3 hours. The crys talline solid was filtered from the cooled reaction mixture and identified as 7 (D-u-t-butoxycarboxamido 3 acetacid was amidophenylacetamido)-cephalosporanic acid, weight 2.1 g. having the following analysis (values corrected for 4.59% water): C, 53.6; H, 5.17; N, 10.08. Calcd for C H N O S: C, 53.4; H, 5.38; N, 9.96.
The solvent was evaporated from the filtrate at reduced pressure. Toluene was added to the residue and this evaporated at reduced pressure to completely remove water and formic acid. This was repeated three times. The residue was triturated with wet ethyl acetate and then with anhydrous ether giving crude 7 (D-a-amino-3- acetamidophenylacetamido)-cephalosporanic acid as a filterable solid; weight 3.8 g. This crude product (3.5 g.) was combined with a two-phase system of water and ethyl acetate, a small amount of dark colored impurity being removed by filtration. The filtrate was concentrated to a small volume at reduced pressure. The aqueous concentrate deposited a small amount of crystalline impurity which was removed by filtration. The aqueous filtrate was concentrated to dryness, the residue triturated with anhydrous ether and collected by filtration giving 1.6 g. of 7 (D-ot-amino-3-acetamidophenylacetamido)-cephalosporanic acid. The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
D a t butoxycarboxamido m hydroxyphenylacetic acid: D-a-amino-m-hydroxyphenylacetic acid hydrobromide monohydrate (2.9 g.) in 25 ml. of water was adjusted to pH 4.5 with aqueous sodium hydroxide. Di oxane (25 ml), 0.97 g. of magnesium oxide, and 3.43 g. of t-butoxycarbonyl azide were added and the mixture stirred overnight at 3040 C. under a blanket of nitrogen. The reaction mixture was poured into about 1 liter of ice water and 200 ml. of ethyl acetate. A small amount of solid was removed by filtration. The filtrate was separated into its components and the ethyl acetate phase was extracted with 50 ml. portions of 3% sodium bicarbonate solution. These extracts were combined with the aqueous phase and the solution cooled and acidified to pH 4.5 with 42% phosphoric acid. The product was extracted with five 70 ml. portions of ethyl acetate and the combined extracts washed with water and dried with anhydrous sodium sulfate.
The solvent was evaporated at reduced pressure giving 1.7 g. of D-a-t-butoxycarboxamido-m-hydroxyphenylacetic acid as an oil.
An equivalent amount of either D-a-amino-m-hydroxyphenylacetic acid or the hydrochloride monohydrate may be substituted for the amino acid hydrobromide monohydrate.
7 (D or t butoxycarboxamido m hydroxyphenyl-acetamido)-cephalosporanic acid: Ethyl chloroformate (0.57 ml., 0.006 mole) was added to a solution prepared from 1.7 g. (0.006 mole) of D-a-t-butoxycarboxamido m hydroxyphenylacetic acid, 0.84 ml. (0.006 mole) of triethylamine and 50 ml. of tetrahydrofuran at 10 C. The mixture was stirred at 10 C. for about minutes to complete the formation of the mixed anhydride. A cold (0) solution of 1.63 g. (0.006 mole) of 7-amino-cephalosporanic acid, 0.84 ml. (0.006 mole) of triethylamine, ml. of water, and about 25 ml. of tetrahydrofuran was added to the mixed anhydride and the reaction mixture stirred at 04 C. for one and one-half hours. The tetrahydrofuran was evaporated at reduced pressure. The aqueous residue was extracted once with ethyl acetate (discarded), then layered with ethyl acetate and acidified with 42% phosphoric acid. The aqueous phase was extracted with two additional portions of ethyl acetate. The combined ethyl acetate extracts were washed with cold water, dried with anhydrous sodium sulfate, and the solvent evaporated at reduced pressure. The residue was triturated with Skellysolve B, benzene, and again with Skellysolve B. There was obtained, after drying, 1.8 g. of 7-(D-u-t-butoxycarbox amido m hydroxyphenylacetamido)cephalosporanic acid. The infrared spectrum was consistent with the desired product.
7 (D 0c amino m hydroxyphenylacetamido) cephalosporanic acid: A solution of 1.8 g. of 7-(D-oc-tbutoxycarboxamido m hydroxyphenylacetamido)cephalosporanic acid in 53 ml. of 45% aqueous formic acid was stirred at 40 C. for three hours. The volatile materials were evaporated at reduced pressure. The last traces of water and formic acid were removed by azeotropic distillation with toluene under reduced pressure. The oily residue was triturated with wet ethyl acetate giving a filterable solid. The solid was collected by filtration, washed with ethyl acetate and dried in vacuo giving 890 mg. of 7-(D-ot-amino-m-hydroxyphenylacetamido)cephalosporanic acid. The infrared and nuclear magnetic resonance spectra were consistent with the desired product.
Analysis.Calcd for C18H1907N3S (percent): C, 51.30; H, 4.54; N, 9.97. Found (percent): C, 48.59; H, 5.02; N, 9.00; H O, 5.2.
Found values corrected for 5.2% H 0: C, 51.3; H, 4.4; N, 9.5.
D(-) a carbobenzoxyaminothienyl 3 acetic acid: 5.0 g. (.0318 mole) of D(-)-3-thienylglycine was dissolved in a solution of 2.5 g. (.0625 mole) of sodium hydroxide in 35 ml. of water. The resulting solution was cooled to 0 C. and 5.91 g. (.0348 mole) of carbobenzoxy chloride was added dropwise with stirring. After the addition was completed, the reaction mixture was stirred for 2 hr. at 010 C. The solution was extracted with 35 ml. of ether. The aqueous phase was acidified with concentrated hydrochloric acid and a solid was removed by filtration. The filtrate was extracted with 2X 50 ml. portions of ethyl acetate. The combined extracts were dried over anhydrous magnesium sulfate and evaporated to dryness to yield 7.36 g. of D()-ot-carbobenzoxyaminothienyl-3-acetic acid.
7 (D 0t carbobenzoxyaminothienyl 3' acetamido)cephalosporanic acid: To a stirred suspension of 7.25 g. (.0254 mole) of D()-a-carbobe11zoxyaminothienyl-3-acetic acid in ml. of dry tetrahydrofuran containing 3.55 ml. (.0254 mole) of triethylamine, was added at 05 C. 3.0 g. (.0254 mole) of trimethylacetyl chloride. After being stirred for 8 minutes at 0 C. the mixture was treated with a solution containing 6.94 g. (.0254 mole) of 7-aminocephalosporanic acid, 7.1 ml. (.0508 mole) of triethylamine, 60 ml. of tetrahydrofuran and 60 ml. of water. The reaction mixture was then stirred for 40 minutes at 0 C. and for 1 hr. at 08 C. and was then diluted with 200 ml. of Water. The tetrahydrofuran was removed under reduced pressure, and the residue was layered with ethyl acetate and acidified to pH 2.5 with 42% phosphoric acid. An emulsion formed, and this was filtered through Super-Cel and the layers were separated. The aqueous phase was separated and extracted with fresh ethyl acetate. The combined extracts were washed with 50 ml. of saturated salt solution and were dried over anhydrous magnesium sulfate. Evaporation of the solvent afforded a solid which was triturated with dry ether. The product was collected by filtration and dried to give 3.95 g. (28.4%) of 7-(D-acarbobenzoxyaminothienyl 3' acetamido)cephalosporanic acid. It was characterized by its infrared spectrum (cmr (KBr disc): amide NH, 3300; carboxyl OH and adsorbed H O, 2400-3600; fi-lactam carbonyl, 1775; acetate, carboxyl, carbamate and amide carbonyls 1660-1725.
Sodium 7-(D-ot-aminothienyl-3-acetamido) cephalosporanate: A solution containing 3.95 g. (.00725 mole) of 7 (D-a-carbobenzoxyaminothienyl 3' acetamidocephalosporanic acid, 40 ml. of 1,4-dioxane, 200 ml. of water and 13 ml. of saturated sodium bicarbonate solution was shaken in an atmosphere of hydrogen at an initial pressure of 50 p.s.i. in the presence of 3.98 g. of 30% palladium-on-diatomaceous earth catalyst for 5 min. The reaction mixture was acidified to pH 2 with 6 N hydrochloric acid and was immediately filtered through Super-cel to remove the catalyst. To the filtrate was added saturated sodium bicarbonate solution to bring the pH to 3.8 250 ml. of n-butanol was also added and the mixture was evaporated to dryness under reduced pressure. The residue was triturated with ether and the solid was collected and dried in vacuo. It was suspended in 5 ml. of methylene chloride containing 0.28 ml. or triethylamine. The slurry was stirred for 15 min. and then filtered. To the filtrate was added 0.332 g. of sodium Z-ethylhexanoate (50% solution in ether) followed by 25 ml. of dry ether. The sodium salt which formed was collected by filtration, washed with dry ether and dried in vacuo over phosphorus pentoxide to afford a yield of 0.34 g. of sodium 7-(D-e-aminothienyl-3-acetamido)-cephalosporanate. The infrared spectrum (KBr disc) showed the following absorptions (cmr NH and NH, 3200-3600; ,9-lactam, and acetate carbonyls, 1760; amide carbonyl 1670; carboxylate, 1600.
Analysis.-Calcd. for C H N O S Na (percent): C, 44.34; H, 3.72. Found (percent): C, 44.21; H, 5.34.
Sodium D() a [(carbomethoxypropene 2 yl) amino1-thienyl 3 acetate: 0.745 g. (0.324 mole) of metallic sodium was dissolved in 100 ml. of hot 2- propanol. 5.10 g. (0.324 mole) of methyl acetoacetate were added to the solution, and the mixture was stirred and heated under reflux for 1 /2 hr. The hot solution was filtered and the filtrate was allowed to cool to 5 C. The crystalline product which precipitated was collected by filtration and dried in vacuo over phosphorus pentoxide to aiford 7.0 g., 78% of colorless needles of sodium D()-Ct [(1 carbomethoxypropene 2 yl)amino] thienyl-3-acetate, M.P. 209-212 decomp. An analytical sample was prepared by recrystallization from hot 2- propanol to give colorless rosettes of M.P. 215217. Infrared spectrum (KBr disc. absorptions at 1645 cm.- for ester carbonyl and 1575 cm. for carboxylate) and n.m.r. spectrum (solution in D were consistent with the desired structure; the n.m.r. spectrum showed the sample contained 2-propanol.
Analysis.Calcd. for C H NO SNa-C H O (percent): C, 49.84; H, 5.98; N, 4.15. Found (percent): C, 49.07, 48.85; H, 5.65, 6.04; N, 4.40.
7 [2,2' dimethyl 5 oxo 4' (3" thienyl)-1'- imidazolidinyl] 3 acetoxymethyl-M-cephem 4 carboxylic acid. A solution of 1.08 g. (.01 mole) of ethyl chloroformate in 35 ml. of acetone containing 3 drops of N,N-dimethylbenzylamine was cooled at 5 C. With stirring, 2.77 g. (0.1 mole) of powdered sodium D()- a-[(carbomethoxypropene 2 yl)amino]thienyl 3- acetate was added, and the mixture was stirred for 20 min. at 5 to 0 C. A solution of 2.72 g. (0.1 mole) of 7-aminocephalosporanic acid was prepared in ml. of water by the dropwise addition of triethylamine to pH 8.0. 15 ml. of acetone was added and the chilled solution was added with stirring to the solution of the mixed anhydride previously described. After the addition was completed, the mixture was stirred for 1 hr. at 0 C. It was then filtered and the acetone was removed by evaporation under reduced pressure. The residue was shaken briefly with 40 ml. of methyl isobutyl ketone and 5 ml. of 88% formic acid. The mixture was filtered through Super-eel and the Z-phase filtrate was stirred for 1 hr. at 0 C. and then stored for 18 hr. at 0 C. An amorphous pale tan solid was collected by filtration and dried in vacuo over phosphorus pentoxide. This process afforded 0.212 g., 5% of crude 7-[2,2-dimethyl-5-oxo-4- (3"-thienyl)-1-imidazolidinyl] 3 acetoxymethyl A cephem-4-carboxylic acid.
A suspension of 206 mg. (5 mole) of this material and 51 mg. (.5 mmole) of triethylamine in 5 ml. of dry acetone was stirred for 65 hrs. of 23 C. The mixture was filtered and the filtrate was evaporated to dryness. The residue was suspended in water and the pH was adjusted to 3.5 with phosphoric acid to give creamcolored, solid 7 [2',2'-dimethyl-5'-oxo-4-(3"-thienyl)- 1 imidazolidinyl] 3 acetoxyrnethyl A cephem 4- 32 carboxylic acid, which was collected by filtration, washed with cold water and dried in vacuo over phosphorus pentoxide. The infrared spectrum (KBr disc) had absorptions (cm. for NH, 3350; fi-lactam carbonyl, 1780; acetate, carboxyl and imidazolidinone carbonyls, 1740-1700, acetate, 1230.
D() a t butoxycarboxamido 3 thienylacetic acid: An intimate mixture of 15.72 g. (0.1 mole) of D(- )-3-thienylglycine and 8.06 g. (0.2 mole) of magnesium oxide powder was suspended in 250 ml. of 50% aqueous dioxane. 28.6 g. (0.2 mole) of t-butoxycarbonyl azide was added dropwise with vigorous stirring, and the mixture was stirred for 20 hr. at 45-50". The mixture was cooled, diluted with 1 l. of ice-water and stirred briefly with 250 ml. of ethyl acetate. The layers were separated and the organic phase was extracted with 50 ml. of 3% sodium bicarbonate solution and then with 50 ml. of water. All the aqueous fractions were then combined and the pH was lowered to 5 with 42% phosphoric acid. The product was extracted into 3 250 ml. portions of ethyl acetate. The combined extracts were washed with water, dried over magnesium sulfate, and evaporated to dryness under reduced pressure. Trituration of the oily residue with ether and Skellysolve B gave 18.7 g. (72%) of crystalline D()-at-butoxycarboxamido-3- thienylacetic acid M.P. 102-103". An analytical sample was recrystallized from ethyl acetate and Skellysolve B to give colorless needles, M.P. 104405", [a] C. ---107" (c.=1.0, CH OH).
Calcd. for C I-1 N0 8 (percent): C, 51.36; H, 5.88. Found (percent): C, 51.49; H, 5.56.
7 (D 0c t butoxycarboxamido 3 thienylacteamido)-cephalosporanic acid: A solution of 12.87 (.05 mole) of D(-)-a-t-butoxycarboxa mido-3thienylacetic acid and 5.06 g. .05 mole) of triethylamine in 200 ml. of dry tetrahydrofuran was cooled to 10. 5.43 g. (.05 mole) of ethyl chloroforrnate was added dropwise with stirring and the resulting mixed anhydride solution was stirred for 12 min. at -10. A chilled (5) solution of 13.62 g. .05 mole) of 7-aminocephalosporanic acid and 5.06 g. (.05 mole) of triethylamine in 200 ml. of 50% aqueous tetrahydrofuran was added in one portion. The reaction mixture was stirred for 1% hr. at 0 and after filtration the tetrahydrofuran was removed from the filtrate under reduced pressure The residue was dissolved in a mixture of 300 ml. of water and 150 ml. of ethyl acetate. After a brief shaking, the layers were separated and the aqueous phase was cooled and acidified to pH 3 with 42% phosphoric acid. The product was extracted into 3x 200 ml. portions of ethyl acetate and the combined extracts were washed with water and dried over magnesium sulfate. Evaporation of the solvent left an oil which was solidified by trituration with ether and Skellysolve B to give 21.7 g. of 7-(D-zx-tbutoxycarboxamido 3-thienylacetamido)cephalosporanic acid. It was characterized by its infrared spectrum (crnf (KBr disc): amide NH, 3340, ,B-lactam carbonyl, 1790; acetate, amide, carbamate and carboxyl carbonyls, 1750-1680; amide deformation 1520.
7 (D 0t amino 3 thienylacetamido)cephalosporanic acid: A solution of 7.67 g. (.015 mole) of 7- (D u t butoxycarboxamido 3 thienylacetamido)- cephalosporanic acid in 40 ml. of 45% aqueous formic acid was stored at 40 for 3 hr. The solution was evaponated to dryness under reduced pressure and the last traces of formic acid were removed by azeotropic distillation with toluene under reduced pressure. The residue was triturated with a mixture of 40 ml. of ethyl acetate and 2 ml. of water, and then with ether to give 5.3 g. (85%) of 7-(D-warnino-3-thienylacetamido)cephalosporanic acid. infrared and n.m.r. spectra were fully consistent with the structure.
Calcd. for C15H17N3O6S2H2O (percent): C, 44.74; H, 4.46. Found (percent): C, 44.54; H, 4.83.
7 [2,2 dimethyl 5 x0 4 (3 thienyl)-1-imidazolidinyl1cephalosporanic acid: 5.1 g. of 7-(D-u-amino- 3-thienylactamido)cephalosporanic acid was slurried in a mixture of 170 ml. of acetone and 130 ml. of methanol. 1.23 g. (1 equivalent) of triethylamine was added with stirring and the resulting solution was stirred for 16 hr. at room temperature. A small amount of insoluble material was removed by filtration and the filtrate was evaporated to dryness under reduced pressure. The residue was dissolved in a mixture of 60 ml. of water and 40 ml. of ethyl acetate. This mixture was cooled and the pH of the aqueous phase was lowered to 3.0 with 42% phosphoric acid with stirring. The layers were separated and the aqueous phase was extracted With 2X 60 ml. of fresh ethyl acetate. The combined extracts were washed with water and evaporated to dryness, and the solid residue was triturated with ether to give 2.1 g. (38%) of hydrated 7-[2,2-dimethyl-5-oxo-4-(3-thienyl) 1 imidazolidinyl] cephalosporanic acid. Infrared and n.m.r. spectra were fully consistent with the proposed structure.
Calcd. for C H N O S- /2H O (percent): C, 49.66; H, 4.61. Found (percent): C, 49.48; H, 4.83.
The synthesis of desacetoxycephalosporins, including cephalexin and some analogs, has also been described by C. W. Ryan et al., J. Med. Chem. 12, 310-313 (March 1969) and in the references given in the footnotes therein.
(C) Preparation of -chloro-3-substituted-1,2,4-
oxadiazoles I In the preparation of 5-chloro-3-substituted-1,2,4- oxadiazoles the universal and most useful starting material is an aromatic or aliphatic nitrile as illustrated by the preceding examples. These are well-known compounds which are prepared, for example, by the methods outlined in classic textbooks such as Organic Preparations by Conrad Weygand, Interscience Publishers, Inc., New York (1945) on pages 115, 255 and 367 and The Chemistry of the Carbon Compounds by Victor Van Richter edited by Richard Anschntz, Third English edition, Elsevier Publishing Co., Inc., New York, N.Y. (1946) in vol. III at pages 304306 and in vol. I at pages 325-327 and Laboratory Methods of Organic Chemistry by L. Gattermann revised by H. Wieland, translated from the twentyfourth edition, MacMillan and Co., Limited, London (1943) at pages 137-138 and by the following procedure:
Z-furamide 11.1 g., 0.1 mole, Eastman Kodak Co.) and phosphorus pentoxide (21 g., 0.15 mole) were mixed in and heated with a Meeker burner (gently at first and then more strongly) until 2-cyanofuran distilled at 130"- 140 C., 5.6 g.
Such amides are prepared by published methods as illustrated in the following table in which it is to be understood that acids are converted to acid chlorides by treatment with thionyl chloride and acid chlorides are converted to amides by reaction with ammonia:
Amide Illustrative sources Acid, acid chloride, amide: Looker, Wilson, J. Heterocyclic Chem. 2 (4), 348 (1965); Acid acid chloride, ethyl ester: Hurd, Mori, J. Am. Chem. Soc. 77, 5362 (1955).
l W ONHQ Acid, ethyl ester, amide: U.S.
Amide Illustrative sources Quilico, Panizzi, Gazz. Chim. Ital. 72, 458 (1942); Quilico, Stagno dAlcontres, Gazz. Chim. Ital. 79, 654 (1949); Mina Rateb, Soliman, J. Chem. Soc. 1962, 4234.
N Amide: commercially available. -CONH2 C Il -HG O NH:
Amide, acid: Beil. 27, 707; Acid chloride: readily prepared by known methods.
Acid, acid chloride: Doyle and ayler, U.S. 2 996,501 and references cited therein.
Acid, acid chloride: Doyle and N ayier, U.S. 2,996,501 and references cited therein.
Such amide oximes are converted to 5-hydroxy-3-substituted-l,2,4-oxidiazoles by the process described in Beilstein, 27, 644, II 698 and reference therein as follows:
:08 C-Hil C1- a l c 0 2 B aim and also by the procedure of Moussebois and Eloy, Helv. Chim. Acta, 47, 838 (1964) thus:
non
An alternate, route to; the reagents in the procedure of Mousse'mo'is'et al. is provede'd by Chemical Abstracts, 65, 15391 g. and U.S. Pat. 3,264,318 as follows:
I r a r r v I claim:
V 7 H v K g 1. Aeompound of the formula i ga a c n uco R1 7 1 g n O s" ca -'C-N'H-CH-CH '05 I &3 02:} --1!I CH A t R 5 0 1 2 c H N a o cc1 ll s a O u These 5 hydroxy 3-subst1tuted-1,2,4-oxad1azo1es are Y an M citen e3 then converted to the desired 5-chlor0-3-substituted-1,2,4- v NH c325 oxadiazoles by the general method reported in Chemical I Abstracts 65, P 732i (Japan Pat. 4,985 or 1966) thus:
H-- N.- c --2 060M An alternate preparation of 5-chloro-3-substitutedwherein A is hydrogen, acetoxy, pyridinium, picolinium 1,2,4-oxadiazoles utilizes the procedure of Moussebois and or lutidinium; and M is hydrogen, a pharmaceutically ac- Eloy, Helv. Chem. Acta, 47, 838 (1964) thus: ceptable, nontoxic cation or an anionic charge when A the required reagent is prepared by the procedures of is one of said quaternary ammonium radicals; and R Ainsworth et aL, J. Med. Chem. 10, 208 (1967) and US. R and R each is hydrogen; Z is (lower)alkyl', cyclo- Pat. 3,279,988 thus: alkyl having 4, 5, 6 or 7 carbon atoms, monohaloflower) 51011 no (x 11 5 c1-Q-c-mr -i-- c1 ncooa I Dimetzhylformamide t 0 20013 Additional, illustrative preparations of such reagents alkyl, dichloromethyl, trichloromethyl, are as follows 5 I a 2 .n 5 a l? 3 rte (11 to I 3:26am} I s 4 ST V I v I a R5 R4 r s a Rs k0 q c 9) I L wherein n is an integer from to 3 inclusive and R R and R each is hydrogen.
2. A compound of claim 1 having the D(-) configuration.
3. A compound of claim 2 wherein Z is phenyl, 2- thienyl, 3-thienyl or 2-furyl.
4. A compound of claim 2 wherein Z is (lower)alkyl, chloromethyl, dichlorornethyl, or trichloromethyl.
5. A compound of claim 2 wherein Z is phenyl, 2- thienyl, 3-thienyl or 2-furyl and A is hydrogen.
6. A compound of claim 2 wherein n is zero and Z is one of the specified aromatic radicals.
7. A compound of claim 2 wherein Z is phenyl, 2- thienyl, 3-thienyl or Z-furyl and A is pyridinium.
8. A compound of claim 2 wherein Z is phenyl, 2- thienyl, 3-thienyl or Z-furyl and A is acetoxy.
9. The compound of claim 1 known as 7 [D a- (3 benzimidoylureido)phenylacetamido]cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
10. The compound of claim 1 known as 7 {D a- [3 (2 furimidoyl)ureido]phenylacetamido}cepha1osporanic acid and its nontoxic, pharmaceutically acceptable salts.
11. The compound of claim 1 known as 7 {D oz- [3 (2 thienimidoyl)ureido]phenylacetamido}cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
12. The compound of claim 1 known as 7 {D u.- [3 (3 thienimidoyl)ureido]phenylacetamido}cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
13. The compound of claim 1 known as 7 [D a- (3 acetimidoylureido)phenylacetamido]cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
14. The compound of claim 1 known as 7 [D a- (3 benzimidoylureido) 2 thienylacetamido]cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
15. The compound of claim 1 known as 7 {D w [3 (2' furimidoyl)ureido] 2 thienylacetamido} cephalosporanic acid and its nontoxic, phannaceutically acceptable salts.
16. The compound of claim 1 known as 7 {D a- [3 (2' thienimidoyl)ureido] 2 thienylacetamido} cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
17. The compound of claim 1 known as 7 {D oz- [3 (3' thienimidoyDureido] 2 thienylacetamido} 38 cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
18. The compound of claim 1 known as 7 [D a- (3 acetimidoylureido) 2 thienylacetamido1cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
19. The compound of claim 1 known as 3 desacetoxy- 7 [D a (3 benzimidoylureido)phenylacetamido] cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
20. The compound of claim 1 known as 3 desacetoxy- 7 {D a [3 (2' furimidoyl)ureidoJphenylacetamido}cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
21. The compound of claim 1 known as 3 desacetoxy- 7 {D a [3 (2 thienimidoyl)ureido]phenylacetamido}cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
22. The compound of claim 1 known as 3 desacetoxy- 7 {D a [3 (3' thienimidoyl)ureido]phenylacetamid0}cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
23. The compound of claim 1 known as 3 desacetoxy- 7 [D on (3 acetimidoylureido)phenylacetamido cephalosporanic acid and its nontoxic, pharmaceutically acceptable salts.
24. 7 [D a (3 benzimidoylureido)phenylacetamido]cephalosporanic acid.
25. 7 {'D a [3 (2' furimidoyl)ureido]phenylacetamido}ccphalosporanic acid.
26. 7 {D a [3 (2' thienimidoyl)ureidoJphenylacetamido}cephalosporanic acid.
27. 7 [D a (3 benzimidoylureido)phenylacetamido] 3 (1 pyridylmethyl) 3 cepheme 4 carboxylic acid betaine.
28. The sodium salt of the compound of claim 26.
29. The potassium salt of the compound of claim 26.
References Cited UNITED STATES PATENTS 3,479,339 11/1969 Holdrege 260239.1 3,481,922 12/ 1969 Holdrege 260-239.1 3,483,188 12/1969 McGregor 2-60239.1
NICHOLAS S. RIZZO, Primary Examiner US. Cl. X.R. 424246