Process for the preparation of 7-acylamino-3-(thio-substituted)methyl-3-cephem-4-carboxylic acid 1-oxide derivatives
申请人:GIST-BROCADES N.V.
公开号:EP0047560A2
公开(公告)日:1982-03-17
Process for the preparation of 7-acylamino-3-(thio--substituted)methyl-3-cephem-4-carboxylic acid 1-oxide derivatives by reacting a 7-acylamino-3-bromomethyl-3--cephem-4-carboxylic acid 1-oxide derivative with a silylated thiol of the general formula:
wherein R represents an organic group, preferably a 5- or 6-membered heterocyclic group, which reaction is preferably carried out in the presence of an inert organic solvent at a temperature between - 20° and 80°C thereby obtaining the corresponding 7-acylamino-3-(R--thiomethyl)-3-cephem-4-carboxylic acid 1-oxide derivatives, many of which are valuable intermediates in methods for the preparation of therapeutically active cephalosporins.
7-acylamino-3-(thio--substituted)methyl-3-cephem-4-carboxylic acid 1-oxide derivatives 的制备方法,该方法是将 7-acylamino-3-bromomethyl-3-cephem-4-carboxylic acid 1-oxide derivatives 与通式如下的硅烷化硫醇反应:
其中 R 代表有机基团,最好是 5 或 6 元杂环基团,该反应最好在惰性有机溶剂存在下进行,温度在 -20° 至 80°C 之间,从而得到相应的 7-酰氨基-3-(R--硫甲基)-3-头孢-4-羧酸 1-氧化物衍生物,其中许多衍生物是制备具有治疗活性的头孢菌素的重要中间体。