申请人:GIST-BROCADES N.V.
公开号:EP0299587A1
公开(公告)日:1989-01-18
A process is provided for the preparation of 3-methylene and 3-halomethylene cepham derivatives via 3-phosphoniomethyl-3-cephem derivatives, which in turn can be prepared from 3-halomethyl-3-cephem derivatives. The preparation can be carried out with or without isolating the intermediate phosphonium cephem compounds. The 3-methylene and 3-halomethylene cepham derivatives and in particular the 1-oxo and 1,1-dioxo cepham compounds are also prepared by reducing a 3-halomethyl-3-cephem derivative with activated metal, preferably zinc or magnesium.
本发明提供了一种通过 3-膦甲基-3-头孢烷衍生物制备 3-亚甲基和 3-卤代亚甲基头孢烷衍生物的工艺,而 3-亚甲基和 3-卤代亚甲基头孢烷衍生物又可由 3-卤代亚甲基-3-头孢烷衍生物制备。在制备过程中,可以分离或不分离中间体膦头孢化合物。3-亚甲基和 3-卤代亚甲基西帕姆衍生物,特别是 1-氧代和 1,1-二氧代西帕姆化合物,也可以通过用活化金属,最好是锌或镁还原 3-卤代-3-西帕姆衍生物来制备。