Synthesis of 5-Aryl-4-sulfanylidene-2,3,4,5,6,8-hexahydro-7H-pyrido[3,2-e][1,3]thiazin-7-ones

Abstract

N-Methylmorpholinium 4-aryl-5-cyano-2-oxo-1,2,3,4-tetrahydropyridine-6-thiolates reacted with hydrogen sulfide and formaldehyde in ethanol to give 5-aryl-4-sulfanylidene-2,3,4,5,6,8-hexahydro-7H-pyrido[3,2-e][1,3]thiazin-7-ones. The molecular and crystal structures of N-methylmorpholinium 5-cyano-2-oxo-4-(3,4,5-trimethoxyphenyl)-1,2,3,4-tetrahydropyridine-6-thiolate were determined by X-ray analysis.