The synthesis, microbiological profile and in vivo effectiveness in laboratory animals of a series of cephalosporins having 7-acyl substituents derived from methylthioacetic acid are described. Structure-activity relationships examined include the effect of oxidation of the side-chain sulfur atom, replacement of the (side-chain) methyl hydrogens by fluorine and replacement of the 3-acetoxy substituent by thioheterocycles. One derivative, 7-trifluoromethylthioacetamido-3-(1-methyl-1H-tetrazol-5-ylthiomethyl)-3-cephem-4-carboxylic acid (SK&F 59962), was found to have outstanding antibacterial activity in vitro and in vivo.
本研究介绍了一系列
头孢菌素的合成、微
生物学特征和在实验室动物体内的有效性,这些
头孢菌素的 7-酰基取代基来自甲
硫基
乙酸。所研究的结构-活性关系包括侧链
硫原子氧化、
氟取代(侧链)甲基氢和
硫杂环取代 3-乙酰氧基取代基的影响。其中一种衍
生物,即 7-三
氟甲基
硫代乙酰
氨基-3-(
1-甲基-1H-四唑-5-基
硫甲基)-3-头孢-4-
羧酸(SK&F 59962),在体外和体内都具有出色的抗菌活性。