Multicomponent Synthesis of 4-Alkyl(Aryl, Hetaryl)-2-alkoxycarbonyl(aroyl, carbamoyl)- 3,6-diamino-5-cyanothieno[2,3-b]pyridines.

The condensation of malononitrile with hydrogen sulfide and aldehydes in the presence of triethylamine in ethanol at room temperature afforded 4-alkyl(aryl, hetaryl)-2,6-diamino-3,5-dicyano-4H-thiopyrans. Treatment of the latter in situ with alkali in DMF, followed by addition of an alkylating agent, led to the formation of 4-alkyl(aryl, hetaryl)-2-alkoxycarbonyl(aroyl, carbamoyl)-3,6-diamino-5-cyanothieno[2,3-b]- pyridines. [ABSTRACT FROM AUTHOR]