Fused Mesoionic Heterocycles Analogues of Heptafulvene: Synthesis of 1, 3, 4-Thiadiazolo[3, 2-a]Pyridylium-2-Methylides

Abstract

A number of 1, 3, 4-thiadiazolo[3, 2-a]pyridylium-2-methylides have been prepared either from 1-amino-4, 6-diphenylpyridine-2-thione and 3,3-bis(methylthio) acrylonitriles or by the reaction of the conjugate anion of active methylene compounds with 2-methylthio-1, 3, 4-thiadiazolo[3, 2-a]pyridinium cations.