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 (III, Q is CN) or 1,2-dihydro-6-(lower-alkyl)-2-oxo-5-(pyridinyl)nicotinamides (III, Q is CONH.sub.2) which comprises reacting a pyridinylmethyl lower-alkyl ketone (I) with tri-(lower-alkyl) orthoformate, acetic anhydride and acetic acid to produce 2-(lower-alkoxy)-1-(pyridinyl)ethenyl lower-alkyl ketone (II), reacting II 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 resides in the intermediate 2-(lower-alkoxy)-1-(pyridinyl)ethenyl lower-alkyl ketones (II) and its two step conversion, as described above, to said compounds (III, Q is CN or CONH.sub.2).
该发明的一个方面在于制备具有心脏强效作用的1,2-二氢-6-(较低烷基)-2-氧代-5-(
吡啶基)烟酰腙(III,Q为CN)或1,2-二氢-6-(较低烷基)-2-氧代-5-(
吡啶基)烟酰胺(III,Q为CONH.sub.2)的三步反应过程,其中包括将
吡啶基甲基较低烷基酮(I)与三-(较低烷基)正
甲酸酯、
乙酸酐和
乙酸反应,以产生2-(较低烷氧基)-1-(
吡啶基)
乙烯基较低烷基酮(II),将II与
氰乙酰胺或马隆酰胺在碱性
缩合剂的存在下反应,并中和反应混合物,其中
吡啶基为4-或3-
吡啶基或4-或3-
吡啶基具有一或两个较低烷基取代基。该发明的其他方面在于中间体2-(较低烷氧基)-1-(
吡啶基)
乙烯基较低烷基酮(II)及其如上所述的两步转化为所述化合物(III,Q为CN或CONH.sub.2)。