The synthesis and the in vitro and in vivo antimicrobial activities of a series of 7-[2-(2-aminothiazol-4-yl)acetamido]cephalosporins (1) having varied 3-substituents, such as methyl, hydroxymethyl, acetoxymethyl, pyridiniomethyl and heterocyclicthiomethyls, are described. The derivatives having five membered heterocyclicthiomethyls exhibited strong inhibitory activities against Gram-negative organisms including some strains of Escherichia coli and Proteus morganii which are insensitive to cefazolin and cephaloridine. Pronounced activities were noted with 7-[2-(2-aminothiazol-4-yl)-acetamido]-3-[[[1-(2-dimethylaminoethyl)-1H-tetrazol-5-yl]thio]methyl]ceph-3-em-4-carboxylic acid (1y; SCE-963).
报道了一系列7-[2-(
2-氨基噻唑-4-基)乙酰
氨基]
头孢菌素(1)的合成及其体外和体内的抗菌活性,这些化合物具有不同的3-取代基,如甲基、羟甲基、乙酰氧甲基、
吡啶鎓甲基和杂环
硫甲基等。含有五元杂环
硫甲基的衍
生物对包括某些对头孢唑林和头孢利定不敏感的大肠杆菌和摩根氏变形杆菌等革兰氏阴性菌表现出强烈的抑制活性。特别值得注意的是7-[2-(
2-氨基噻唑-4-基)乙酰
氨基]-3-[[[1-(2-
二甲氨基乙基)-
1H-四唑-5-基]
硫]甲基]头孢-3-烯-4-
羧酸(1y;SCE-963)显示了显著的活性。