The synthesis and antibacterial activity of a series of β-lactamase stable, broad spectrum 7-[2-(2-amino-thiazol-4-yl)-2-(Z)-(methoxyimino)acetamido]-cephalosporins, characterised by a C-3-[N-(substituted-amino)pyridinium-4-thiomethyl] group, is described. Gram-positive and Gramnegative bacteria including extended spectrum β-lactamase-producing strains were most susceptible to the N-amino- and N-methylamino derivatives (3a) and (3b); with the exception of Pseudomonas aeruginosa, (3b) was more active in vitro and in vivo than cefpirome or ceftazidime.
本文介绍了一系列对 β-内酰胺酶稳定的广谱 7-[2-(2-
氨基-
噻唑-4-基)-2-(Z)-(甲氧基亚
氨基)乙酰
氨基]-
头孢菌素的合成和抗菌活性,其特点是具有一个 C-3-[N-(取代-
氨基)
吡啶-4-
硫甲基]基团。革兰氏阳性菌和革兰氏阴性菌,包括广谱β-内酰胺酶产生菌株,对 N-
氨基和 N-甲基
氨基衍
生物 (3a) 和 (3b) 最敏感;除
铜绿假单胞菌外,(3b) 在体外和体内的活性均高于
头孢匹罗或
头孢他啶。