Accessing Enantiopure Endocyclic Sulfoximines Through Catalytic Cycloisomerization of Oxygenated Propargyl‐Sulfinamides

Abstract

Abstract In this study, a novel strategy to access endocyclic sulfoximines in an enantiopure form is reported. The approach is based on a silver nitrate‐catalyzed cyclo‐isomerization reaction of oxygenated propargylic sulfinamides and provides efficiently 5‐membered endocyclic sulfoximines (isothiazole 1‐oxide). These new heterocyclic scaffolds can be isolated or directly converted into cyclic sulfinamides via Lewis acid‐mediated sulfur dealkylation reactions. magnified image