Low-temperature, aqueous conversion of 4-picoline derivative to
5-cyano-[3,4'-bipyridin]-6(1H)-one
    2.
    发明授权
    Low-temperature, aqueous conversion of 4-picoline derivative to 5-cyano-[3,4'-bipyridin]-6(1H)-one 失效
    4-甲基吡啶衍生物低温水溶液转化为5-氰基 - [3,4'-联吡啶] -6(1H) - 酮

    公开(公告)号:US4310670A

    公开(公告)日:1982-01-12

    申请号:US124807

    申请日:1980-02-26

    CPC分类号: C07D213/84 C07D213/38

    摘要: The process which comprises reacting 4-picoline below about 30.degree. C. with at least three mole equivalents of an inorganic acid halide, preferably phosphorus oxychloride, per mole of 4-picoline and excess dimethylformamide, reacting in solution the unisolated resulting N-[3-dimethylamino-2-(4-pyridinyl)-2-propenylidene]-N-methylmethaniminium salt (after adding the reaction mixture to cold water, adjusting the pH to about 8.0 and filtering off the precipitated inorganic cationic salts) with excess .alpha.-cyanoacetamide and at least three mole equivalents of base, and then isolating 5-cyano-[3,4'-bipyridin]-6(1H)-one in free base form (after neutralization) or in the form of its inorganic cationic salt. Said 5-cyano-[3,4'-bipyridin]-6(1H)-one is an intermediate for preparing the cardiotonic amrinone.

    摘要翻译: 该方法包括使低于约30℃的4-甲基吡啶与每摩尔4-甲基吡啶和过量的二甲基甲酰胺与至少三摩尔当量的无机酰卤,优选三氯氧化磷反应,在溶液中使未分离的所得N- [3 - 二甲基氨基-2-(4-吡啶基)-2-亚丙烯基] -N-甲基亚胺鎓盐(将反应混合物加入到冷水中,调节pH至约8.0,过滤沉淀的无机阳离子盐)与过量的α-氰基乙酰胺 和至少三摩尔当量的碱,然后分离游离碱形式(中和后)的5-氰基 - [3,4'-联吡啶] -6(1H) - 酮或其无机阳离子盐的形式。 所述5-氰基 - [3,4'-联吡啶] -6(1H) - 酮是制备强心型氨力农的中间体。