N,N-Dialkyl (N'-Chlorosulfonyl)chloroformamidines in Heterocyclic Synthesis. I. The Preparation of [1,2,3,5]Thiatriazole and [1,3,2,4]Oxathiadiazole Derivatives

Abstract

N,N-Dialkyl (N′-chlorosulfonyl)chloroformamidines 1 react regiospecifically with hydrazine derivatives to give [1,2,3,5]thiatriazole dioxides. Reaction of 1 with hydroxamic acids and N-methyl hydroxylamine gave derivatives of [1,3,2,4]oxathiadiazole dioxide 7, a new heterocycle.