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    • 1. 发明授权
    • Process for the manufacture of 7-amino-3-cephem-4-carboxylic acid derivatives
    • 制备7-氨基-3-头孢烯-4-羧酸衍生物的方法
    • US3928331A
    • 1975-12-23
    • US39287773
    • 1973-08-30
    • HOECHST AG
    • BAUERSCHMIDT EBERHARDBORMANN DIETERWORM MANFRED
    • C07D501/04C07D20060101C07D501/16C07D501/18
    • C07D499/00
    • Process for the manufacture of 7-amino-3-cephem-4-carboxylic acids and the esters thereof of the formula I

      in which A stands for hydrogen, alkyl, acyloxy, alkyloxy or hydroxy and R stands for hydrogen, optionally substituted linear or branched alkyl, cycloalkyl, aryl, aralkyl, aryloxyalkyl, alkoxyalkyl, acryloxyalkyl, aroylalkyl, or a heterocyclic radical and the salts thereof which comprises reacting 7-acylamino-3cephem-4-carboxylic acid esters of the general formula II

      in which R'' stands for optionally substituted alkyl, aryl, aralkyl, aryloxyalkyl, alkoxyalkyl or a heterocyclic radical and R'''' has the meaning given for R but cannot stand for hydrogen and A is defined as above, in an inert solvent with a silylating agent in the presence of a base, converting the amido group activated by the silylation into the iminohalide by adding a halogenating agent, allowing it to react with an alcohol to yield the iminoether hydrohalide, hydrolyzing the iminoether hydrohalide and optionally splitting the 7-amino-3-cephem-4carboxylic acid ester of the general formula I to yield the free acid, the esters obtained being valuable intermediates.
    • 制备7-氨基-3-头孢烯-4-羧酸的方法及其分子式Ⅰ的酯,其中A代表氢,烷基,酰氧基,烷氧基或羟基,R代表氢,任选取代的直链或支链 烷基,环烷基,芳基,芳烷基,芳氧基烷基,烷氧基烷基,丙烯酰氧基烷基,芳酰基烷基或杂环基及其盐,其包括使通式II的7-酰基氨基-3-头孢烯-4-羧酸酯与R' 对于任选取代的烷基,芳基,芳烷基,芳氧基烷基,烷氧基烷基或杂环基,R“具有R给出的含义,但不能代表氢,A如上所定义,在惰性溶剂中,在甲硅烷基化剂存在下, 碱,通过加入卤化剂将通过甲硅烷基活化的酰氨基转化成亚胺基卤化物,使其与醇反应得到亚氨基醚氢卤酸盐,水解亚氨基醚氢卤酸盐和任选的 制备通式I的7-氨基-3-头孢烯-4-羧酸酯,得到游离酸,得到的酯是有价值的中间体。