申请人:Sterling Drug Inc.
公开号:US04310670A1
公开(公告)日:1982-01-12
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.
该过程包括在大约30℃以下反应4-哌啶与至少三摩尔当量的无机酸卤化物,优选磷酸氧氯化物,每摩尔4-哌啶和过量二甲基甲酰胺反应溶液中未分离的生成的N-[3-二甲基氨基-2-(4-吡啶基)-2-丙烯基亚胺基]-N-甲基甲酰胺盐(将反应混合物加入冷水,将pH调节到约8.0并过滤沉淀的无机阳离子盐),与过量的α-氰乙酰胺和至少三摩尔当量的碱反应,并随后在中和后以自由碱或其无机阳离子盐的形式分离5-氰基-[3,4'-联吡啶]-6(1H)-酮。所述5-氰基-[3,4'-联吡啶]-6(1H)-酮是制备心力衰竭药物阿米洛酮的中间体。