Patent GB-1327510-A (GB)
Title: Esters of mandeloylaminocephalosporanic acids
IPC: A61K/
Filed: 1971-11-23
Abstract: 1327510 Mandelamidocephalosporanic acid derivatives SMITH KLINE & FRENCH LABORATORIES 23 Nov 1971 [25 Nov 1970] 54335/71 Headings C2A and C2C The invention comprises cephalosporins having the Formula I wherein X and X<SP>1</SP> are each hydrogen, C 1  to C 4  alkyl, C 1  to C 4  alkoxy, halo, trifluoromethyl, nitro or di-alkyl-amino having 2 to 8 carbon atoms; A is hydrogen, C 2  to C 8  alkanoyloxy, pyridinium, C 1  to C 4  alkoxy, C 1  to C 4  alkylthio, or when taken together with M, is a carbon-oxygen bond; M is hydrogen, a non-toxic cation, an anionic charge, or when taken together with A, is a carbon-oxygen bond; and R is C 1  to C 8  aminoalkyl (wherein the alkyl group may be straight or branched and is optionally substituted by one or more hydroxy, mercapto, methylthio, carboxy, amino or phenyl groups), substituted alkyl (wherein the alkyl group has 1 to 8 carbons, is straight or branched, and the substituent is C 1  to C 4  alkoxy, hydroxy, allyloxy, C 1  to C 4  alkylthio, azido, halo, cyano, carboxy, carbalkoxy, wherein the alkoxy group has 1 to 4 carbons, or phenoxy), carbocyclic aryl (optionally substituted with C 1  to C 4  alkyl or alkoxy, halo, nitro, trifluoromethyl, hydroxy, amino, cyano, or di-alkyl-amino having 2 to 8 carbons), heterocyclic aryl (which may be substituted with methyl), carbocyclic aralkyl (in which the alkyl group has 1 to 4 carbons), heterocyclic aralkyl (in which the alkyl group has 1 to 4 carbons) or carbocyclic aryloxyalkyl (in which the alkyl group has 1 to 4 carbons); and also compounds having the Formula II: wherein X, X<SP>1</SP>, A, and M are as previously defined and Alk is a straight or branched alkyl group optionally substituted with one or more hydroxy, mercapto, methylthio, carboxy, amino or phenyl groups. The heterocyclic aryl group is preferably 2-, 3-, or 4-pyridyl, 2- or 3-thienyl, 2- or 3-furyl, thiazolyl, iso-thiazolyl, oxazolyl, triazolyl, thiadiazolyl or sydnonyl. The compounds (I) may be prepared either (a) by esterifying the hydroxyl group of an appropriate mandelamidocephalosporin with an acid of formula R.COOH, preferably previously activated by reaction with a coupling agent such as N,N<SP>1</SP>-carbonyldiimidazole or dicyclohexylcarbodiimide; or (b) by N-acylating an appropriate 7-amino-cephalosporin with a monoesterified mandelic acid, preferably in the presence of one of the aforesaid coupling agents or using the acid chloride in the presence of a base. When R is an amino-containing group, the amino group is protected prior to the preparative reaction. In the case when R is aminoalkyl or amino-(substituted alkyl) and the protecting group is tert.-butoxycarbonyl, the product is a compound of Formula II. Mandelamidocephalosporins of Formula III wherein X, X<SP>1</SP> and M are each H and A is (a) methoxy, ethoxy or butoxy; (b) methylthio, ethylthio or butylthio; and (c) pyridinyl; are prepared as starting materials. The compounds in (a) and (b) are converted to their Na salts. Pharmaceutical compositions having antibiotic activity against Gram-positive and -negative bacteria comprise a compound of Formula I or II as defined above, together with a non-toxic carrier or diluent. O-Azidoacetyl-D-mandelic acid is prepared by esterifying D-mandelic acid with azidoacetyl chloride; the product is converted to its cyclohexylamine salt.