A cephalosporin derivative of the formula I:
in which X is S, 0, CH2 or SO. R1 is (optionally- substituted)imidazol-2-yl or one of the C-7 acyl groups known in the cephalosporin art, R2 is hydrogen or methoxy, R3 is carboxy or a biodegradiable ester thereof and -R4 is of the formula XII, XIII or XIV: R35
in which R32-R40 inclusive are as defined in the specification; and the salts thereof. Pharmaceutical compositions methods of manufacture and intermediates are also described.
式 I 的
头孢菌素衍
生物:
其中 X 是 S、0、
CH2 或 SO。R1 是(任选取代的)
咪唑-2-基或
头孢菌素领域已知的 C-7 乙酰基之一,R2 是氢或甲氧基,R3 是羧基或其
生物降解酯,-R4 是式 XII、XIII 或 XIV: R35
其中
R32-R40 包括在内如说明书中所定义;及其盐类。还描述了药物组合物的制造方法和中间体。