Synthesis of Functionally Substituted 4H-Thiopyrans by Reaction of Carbon Disulfide with Malononitrile Trimer

Abstract

Tripotassium 2-(1-cyano-2,2-disulfidoethenyl)-1,1,3,3-tetracyanopropenide was synthesized for the first time by the reaction of carbon disulfide and malononitrile trimer. Its further transformations afforded 2-amino-4-(dicyanomethylidene)-4H-thiopyran-3,5-dicarbonitrile derivatives.