Compounds useful as cardiotonic agents are 1-R-3-Q-5-PY-2(1H)-pyridinones (I) where R is hydrogen, lower-alkyl or lower-hydroxyalkyl, Q is amino (preferred), lower-alkylamino, di-(lower-alkyl)amino or NHAc, Ac is lower-alkanoyl or lower-carbalkoxy, and PY is 4- or 3- or 2-pyridinyl or 4- or 3- or 2-pyridinyl having one or two lower-alkyl substituents. The corresponding compounds where Q is nitro, carbamyl, cyano, halo or hydrogen are useful as intermediates and those where Q is hydrogen or cyano also are useful as cardiotonic agents. Said compounds are prepared: by reacting .alpha.-PY-.beta.-(R.sub.1 R.sub.2 N)acrolein (II) with malonamide to produce 1,2-dihydro-2-oxo-5-PY-nicotinamide (Ia) and reacting Ia with a reagent capable of converting carbamyl to amino to produce 3-amino-5-PY-2(1H)-pyridinone (Ib); by reacting II or .alpha.-PY-malonaldehyde (II') with .alpha.-cyanoacetamide to produce 1,2-dihydro-2-oxo-5-PY-nicotinonitrile (III) and partially hydrolyzing III to produce Ia; and, by heating 1,2-dihydro-2-oxo-5-PY-nicotincic acid (IV) with a mixture of concentrated sulfuric acid and concentrated nitric acid to produce 3-nitro-5-PY-2(1H)-pyridinone (Ic) and then either reducing Ic to produce Ib or first reacting Ic with an alkylating agent to produce 1-R'-3-nitro-5-PY-2(1H)-pyridinone (Id) and reducing Id to produce 1-R'-3-amino-5-PY-2(1H)-pyridinone (Ib) where R' is lower-alkyl or lower-hydroxyalkyl. Other derivatives of I where Q is amino are shown.
可用作强心剂的化合物是1-R-3-Q-5-PY-2(1H)-
吡啶酮(I),其中R是氢,低烷基或低羟基烷基,Q是
氨基(优选),低烷基
氨基,双(低烷基)
氨基或NHAc,Ac是低烷酰基或低羧基烷基,PY是4-或3-或2-
吡啶基或具有一或两个低烷基取代基的4-或3-或2-
吡啶基。当Q为硝基,
氨基甲酰基,
氰基,卤素或氢时,相应的化合物可用作中间体,而当Q为氢或
氰基时也可用作强心剂。这些化合物的制备方法包括:通过将.alpha.-PY-.beta.-(R.sub.1 R.sub.2 N)
丙烯醛(II)与马隆酰胺反应,制备1,2-二氢-2-氧代-5-PY-烟酰胺(Ia),然后将Ia与能够将
氨基甲酰转化为
氨基的试剂反应,制备3-
氨基-5-PY-2(1H)-
吡啶酮(Ib);通过将II或.alpha.-PY-马隆醛(II')与.alpha.-
氰基乙酰胺反应,制备1,2-二氢-2-氧代-5-PY-烟酰腈(III),然后部分
水解III制备Ia;通过将1,2-二氢-2-氧代-5-PY-
烟酸(IV)与浓
硫酸和浓
硝酸混合物加热,制备
3-硝基-5-PY-2(1H)-
吡啶酮(Ic),然后将Ic还原为Ib,或先将Ic与烷基化试剂反应,制备1-R'-
3-硝基-5-PY-2(1H)-
吡啶酮(Id),然后将Id还原为1-R'-3-
氨基-5-PY-2(1H)-
吡啶酮(Ib),其中R'为低烷基或低羟基烷基。还展示了Q为
氨基的其他衍
生物。