1-R.sub.1 -3-[amino, cyano, carbamyl, halo, lower-alkylamino, di-(lower-alkyl)amino or lower-acylamino]-6-(lower-alkyl)-5-(pyridinyl)-2(1H)-pyridinones or pharmaceutically-acceptable acid-addition or cationic salts thereof are useful as cardiotonic agents, where R.sub.1 is hydrogen, lower-alkyl or lower-hydroxyalkyl. 1-R.sub.1 -3-amino-6-(lower-alkyl)-5-(pyridinyl)-2(1H)-pyridinones are prepared by hydrolyzing the corresponding 3-cyano compounds to produce the corresponding 3-carbamyl compounds and reacting the latter with a reagent capable of converting carbamyl to amino. The 1-R.sub.1 -3-cyano-6-(lower-alkyl)-5-(pyridinyl)-2(1H)-pyridinones are prepared by reacting (pyridinylmethyl) lower-alkyl ketones with dimethylformamide di-(lower-alkyl) acetal to produce 1-(pyridinyl)-2-(dimethylamino)ethenyl lower-alkyl ketone and reacting said ketones with N-R.sub.1 -.alpha.-cyanoacetamide to produce the 1-R.sub.1 -3-cyano-6-(lower-alkyl)-5-(pyridinyl)-2(1H)-pyridinones. Also shown are the conversions: of the 3-cyano compounds to the 3-H compounds; of the 3-H compounds to the 3-halo compounds; of the 3-halo compounds to the 3-[mono-(lower-alkyl)- or di-(lower-alkyl)-amino]compounds; and, of the 3-amino compounds to the 3-lower-acylamino or 3-[mono-(lower-alkyl)- or di-(lower-alkyl)amino] compounds.
1-R.sub.1 -3-[
氨基,
氰基,
氨基甲酰基,卤素,较低烷基
氨基,双-(较低烷基)
氨基或较低酰胺基]-6-(较低烷基)-5-(
吡啶基)-2(1H)-
吡啶酮或其药学上可接受的酸加合物或阳离子盐作为心力衰竭药物具有用途,其中R.sub.1为氢,较低烷基或较低羟基烷基。1-R.sub.1 -3-
氨基-6-(较低烷基)-5-(
吡啶基)-2(1H)-
吡啶酮是通过
水解相应的3-
氰基化合物以产生相应的3-
氨基甲酰基化合物并将后者与能将
氨甲酰基转化为
氨基的试剂反应而制备的。1-R.sub.1 -3-
氰基-6-(较低烷基)-5-(
吡啶基)-2(1H)-
吡啶酮是通过将(
吡啶基甲基)较低烷基酮与二甲基甲酰胺双-(较低烷基)
缩醛反应以产生1-(
吡啶基)-2-(
二甲氨基)
乙烯基较低烷基酮并将该酮与N-R.sub.1-.alpha.-
氰基乙酰胺反应以产生1-R.sub.1 -3-
氰基-6-(较低烷基)-5-(
吡啶基)-2(1H)-
吡啶酮制备的。还显示了以下转化:3-
氰基化合物至3-H化合物的转化;3-H化合物至3-卤素化合物的转化;3-卤素化合物至3-[单-(较低烷基)-或双-(较低烷基)-
氨基]化合物的转化;以及3-
氨基化合物至3-较低酰胺基或3-[单-(较低烷基)-或双-(较低烷基)
氨基]化合物的转化。