Method for production of 3-exomethylenecepham derivatives
    1.
    发明公开
    Method for production of 3-exomethylenecepham derivatives 失效
    Verfahren zur Herstellung von 3-Exomethylencepham-Derivaten。

    公开(公告)号:EP0341694A2

    公开(公告)日:1989-11-15

    申请号:EP89108427.9

    申请日:1989-05-10

    IPC分类号: C07D501/04

    CPC分类号: C07D501/04 Y02P20/55

    摘要: Disclosed is a method of producing a 3-exo­methylenecepham of the formula
    wherein R¹ is amino or substituted amino and R² is a carboxyl-protecting group comprising reacting a cephem of the formula
    wherein R¹ and R² are as defined above and X is halogen with lead metal while maintaining the pH of the reac­tion system at about 0.1 to 8. The cephem (I) may be reacted with a catalytic amount of lead metal or a lead compound in the presence of a metal having a greater ionization tendency than lead.

    摘要翻译: 公开了一种制备式CHEM的3-异亚甲基脑炎的方法,其中R 1是氨基或取代的氨基,R 2是羧基保护基,其包括使式CHEM的头孢烯反应, 1>和R 2如上所定义,X是卤素与铅金属,同时将反应体系的pH保持在约0.1至8℃。头孢烯(I)可以与催化量的铅金属或铅 在具有比铅更大的电离倾向的金属的存在下进行化合物。