申请人:Glaxo Group Limited
公开号:US04427675A1
公开(公告)日:1984-01-24
Cephalosporin antibiotics of general formula ##STR1## (wherein R.sup.a and R.sup.b, which may be the same or different, each represent a C.sub.1-4 alkyl group, or together with the carbon atom to which they are attached form a C.sub.3-7 cycloalkylidene group). These compounds exhibit broad spectrum antibiotic activity, the activity being unusually high against gram-negative organisms such as strains of Pseudomonas organisms. Particularly effective compounds of formula (I) are (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-(2-carboxyprop-2-oxyimino)acetami o]-3-(pyridazinium-1-ylmethyl)ceph-3-em-4-carboxylate and (6R,7R)-7-[(Z)-2-(2-aminothiazol-4-yl)-2-(t-carboxycyclobut-1-oxyimino)ace tamido]-3-(pyridazinium-1-ylmethyl)ceph-3-em-4-carboxylate. The invention also includes the non-toxic salts and non-toxic metabolically labile esters of compounds of formula (I), compositions containing the antibiotic compounds of the invention and a method of combatting bacterial infection utilizing the antibiotics.
头孢菌素抗生素的一般结构式为##STR1##(其中R.sup.a和R.sup.b,可能相同也可能不同,每个代表一个C.sub.1-4烷基基团,或者与它们连接的碳原子一起形成一个C.sub.3-7环烷基亚基团)。这些化合物表现出广谱抗生素活性,对革兰氏阴性生物如假单胞菌菌株的活性异常高。特别有效的化合物的结构式(I)为(6R,7R)-7-[(Z)-2-(2-氨基噻唑-4-基)-2-(2-羧基丙-2-氧基亚氨基)乙酰胺]-3-(吡啶嘧啶-1-基甲基)头孢-3-烯-4-羧酸酯和(6R,7R)-7-[(Z)-2-(2-氨基噻唑-4-基)-2-(t-羧基环丁-1-氧基亚氨基)乙酰胺]-3-(吡啶嘧啶-1-基甲基)头孢-3-烯-4-羧酸酯。本发明还包括化合物(I)的无毒盐和无毒代谢易降解酯,含有本发明抗生素化合物的组合物以及利用这些抗生素对抗细菌感染的方法。