Novel Method of 4,6-Dimethyl-2-thioxo-1,2-dihydronicotinonitrile Synthesis.

Abstract

Condensation of acetaldehyde with cyanothioacetamide and 1-(prop-1-en-2-yl)pyrrolidine has afforded 4,6-dimethyl-2-thioxo-1,2-dihydronicotinonitrile. Alkylation of the latter with α-haloketones yields substituted 2-alkylsulfanyl-4,6-dimethylnicotinonitriles and thieno[2,3-b]pyridines.