申请人:Fujisawa Pharmaceutical Company, Limited
公开号:US04246405A1
公开(公告)日:1981-01-20
A process for preparing a 7-substituted-3-cephem-4-carboxylic acid of the formula: ##STR1## or a pharmaceutically acceptable salt thereof, which comprises subjecting a corresponding 7-substituted-3-organic sulfonyloxy-3-cephem-4-carboxylic acid ester of the formula ##STR2## wherein R is a residue of an organic sulfonic acid, X is esterified carboxy which is an alkoxylcarbonyl, haloalkoxycarbonyl, substituted or unsubstituted aralkoxycarbonyl, benzhydryloxycarbonyl or trityloxycarbonyl, or a pharmaceutically acceptable salt thereof, to hydrogenolysis using a combination of a metal and formic acid as a reducing reagent.
一种制备7-取代-3-头孢菌素-4-羧酸的方法,其化学式如下:##STR1## 或其药用可接受的盐,包括将相应的7-取代-3-有机磺酰氧基-3-头孢菌素-4-羧酸酯化合物(化学式为##STR2## 其中R是有机磺酸的残基,X是酯化的羧基,是烷氧羰基、卤代烷氧羰基、取代或未取代的芳基烷氧羰基、苯基甲氧羰基或三苯甲氧羰基),或其药用可接受的盐,通过使用金属和甲酸的组合作为还原试剂进行氢解反应。