申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04354022A1
公开(公告)日:1982-10-12
A new process for preparing 3-methylenecepham compounds of the formula: ##STR1## wherein R.sup.1 is amino or a protected amino group, and R.sup.2 is a carboxy or a protected carboxy group, or a salt thereof, which comprises reducing a compound of the formula: ##STR2## wherein R.sup.1 and R.sup.2 are each as defined above, and R.sup.3 is halogen or heterocyclicthio which may have suitable sutstituent, or a salt thereof, with a combination of a metal selected from the group consisting of zinc, tin and iron, and an ammonium salt of an acid selected from the group consisting of ammonium halide, ammonium carbonate and ammonium acetate, said 3-methylenecepham compounds being useful as intermediates for preparing antimicrobially active 3-cephem compounds.
一种用于制备3-亚甲基头孢菌素化合物的新工艺,其化学式为:其中R.sup.1为氨基或保护氨基基团,R.sup.2为羧基或保护羧基基团,或其盐,包括还原化合物的步骤,该化合物的化学式为:其中R.sup.1和R.sup.2均如上定义,R.sup.3为卤素或可能具有合适取代基的杂环硫基,或其盐,与锌、锡和铁等金属以及选择自铵卤化物、铵碳酸盐和铵醋酸盐组成的酸铵盐的组合一起还原,所述的3-亚甲基头孢菌素化合物可用作制备具有抗菌活性的3-头孢菌素化合物的中间体。