申请人:STERLING DRUG INC.
公开号:EP0095152A1
公开(公告)日:1983-11-30
One aspect of the invention resides in the three step process for preparing cardiotonically active 1,2-dihydro-6-(lower-alkyl)-2-oxo-5-(pyridinyl)nicotinonitriles or 1,2-dihydro-6-(lower-alkyl)-2-oxo-5-(pyridinyl)nicotinamides which comprises reacting a pyridinylmethyl lower-alkyl ketone with tri-(lower-alkyl) orthoformate, acetic anhydride and acetic acid to produce 2-(lower-alkoxy)-1-(pyridinyl)-ethenyl lower-alkyl ketone reacting the latter with cyanoacetamide or malonamide in the presence of a basic condensing agent and neutralizing the reaction mixture, where pyridinyl is 4- or 3-pyridinyl or 4- or 3-pyridinyl having one or two lower-alkyl substituents. Other aspects of the invention reside in the intermediate 2-(lower-alkoxy)-1-(pyridinyl)ethenyl lower-alkyl ketones, their salts and their two step conversion, as described above, to 1,2-dihydro-6-(lower-alkyl)-2-oxo-5-(pyridinyl)-nicotinonitriles or corresponding nicotinamides.
本发明的一个方面是制备具有生物素活性的 1,2-二氢-6-(低级烷基)-2-氧代-5-(吡啶基)烟酰硝酸酯或 1,2-二氢-6-(低级烷基)-2-氧代-5-(吡啶基)烟酰胺的三步法,包括使吡啶甲基低级烷基酮与三-(低级烷基)原甲酸酯、乙酸酐和乙酸反应,生成 2-(低级烷氧基)-1-(吡啶基)乙烯基低级烷基酮,再使后者与氰乙酰胺或丙二酰酰胺反应、乙酸酐和乙酸反应,生成 2-(低级烷氧基)-1-(吡啶基)-乙烯基低级烷基酮,在碱性缩合剂存在下,使后者与氰乙酰胺或丙二酰胺反应,并中和反应混合物,其中吡啶基是 4-或 3-吡啶基或具有一个或两个低级烷基取代基的 4-或 3-吡啶基。本发明的其他方面在于中间体 2-(低级烷氧基)-1-(吡啶基)乙烯基低级烷基酮、它们的盐和它们的两步转化,如上所述,转化为 1,2-二氢-6-(低级烷基)-2-氧代-5-(吡啶基)-烟酰腈或相应的烟酰胺。