3-Q'-4-R'-5-(RCO)-6-[2-(di-lower-alkylamino) ethenyl]-2(1 H)-pyridinones (II) or salts thereof, where R is lower-alkyl, R" is hydrogen or methyl, and Q' is cyano are useful as intermediates for preparing 1-R"-3-Q-4-R'-5-R-1,6-naphthyridin-2(1H)-ones (I) or salts thereof, which are useful as cardiotonic agents (I, Q is hydrogen, hydroxy, amino, cyano or carbamyl). Processes for preparing the compounds of formula II are shown.
3-Q'-4-R'-5-(RCO)-6-[2-(二低烷基
氨基)
乙烯基]-2(1H)-
吡啶酮 (II) 或其盐,其中 R 是低级烷基,R" 是氢或甲基、Q'为
氰基)的中间体,可用于制备 1-R"-3-Q-4-R'-5-R-
1,6-萘啶-2(1H)-酮(I)或其盐,后者可用作强心剂(I,Q 为氢、羟基、
氨基、
氰基或
氨甲酰)。所示为制备式 II 化合物的工艺。