Novel semi-synthetic cephalosporin derivatives having a fused pyridiniummethyl at 3-position of the cephem nucleus, pharmaceutically acceptable salts, physiologically hydrolizable esters or solvates thereof are disclosed. Also disclosed is a process for preparing the cephalosporin derivatives which comprises introducing a fused pyridiniummethyl substituent at 3-position of 7-.beta.-[(Z)-2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-cephem-ca rboxylic acid derivatives. The compounds of the present invention show potent antibacterial activities and a broad spectrum against both gram-positive and gram-negative bacteria.
新型半合成
头孢菌素衍
生物,在
头孢菌素核的3位具有融合的
吡啶甲基,以及其药用可接受的盐、生理可
水解的酯或溶剂合物。还公开了一种制备
头孢菌素衍
生物的方法,包括在7-β-[(Z)-2-(
2-氨基噻唑-4-基)-2-甲氧基
亚胺基乙酰
氨基]-3-
头孢菌素羧酸衍
生物的3位引入融合的
吡啶甲基取代基。本发明的化合物表现出强大的抗菌活性,并对革兰氏阳性和革兰氏阴性细菌都具有广谱活性。