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-malonaldehye (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-nicotininc 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 Ic 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.
有用作心脏强心剂的化合物是1-R-3-Q-5-PY-2(1H)-
吡啶酮(I),其中R为氢,低烷基或低羟基烷基,Q为
氨基(优选),低烷基
氨基,二(低烷基)
氨基或NHAc,Ac为低烷酰基或低羧烷氧基,PY为4-或3-或2-
吡啶基或4-或3-或2-
吡啶基,具有一个或两个低烷基取代基。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,当Q为氢或
氰基时,也可用作心脏强心剂。所述化合物的制备方法是:通过将α-PY-β-(R1R2N)
丙烯醛(II)与马隆酰胺反应,产生1,2-二氢-2-氧代-5-PY-烟酰胺(Ia),并用能将
氨基甲酰基转化为
氨基的试剂反应Ia,以产生3-
氨基-5-PY-2(1H)-
吡啶酮(Ib);通过将II或α-PY-马隆醛(II')与α-
氰乙酰胺反应,产生1,2-二氢-2-氧代-5-PY-烟酰腈(III),并部分
水解III以产生Ia;通过将1,2-二氢-2-氧代-5-PY-
烟酸(IV)与浓
硫酸和浓
硝酸的混合物加热,产生
3-硝基-5-PY-2(1H)-
吡啶酮(Ic),然后将Ic还原以产生Ib,或首先将Ic与烷基化试剂反应以产生1-R'-
3-硝基-5-PY-2(1H)-
吡啶酮(Id),然后将Ic还原以产生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I的其他衍
生物。