HETERO-1,3-DIPOLAR CYCLOADDITIONS OF DITHIOLANE-ISOCYANATE IMINIUM METHYLIDES - A NOVEL ROUTE TO 1,3-OXAZOLIDINE- AND THIAZOLIDINE-2-THIONES

摘要

Dithiolane- isocyanate imminium methylides which are a new type of azomethine methylide-derived 1,3-dipole undergo efficient and regioselective cycloaddition to conjugated carbonyls and thiocarbonyls to yield predominantly 1,3-oxazolidine- and thiazolidine-2-thiones formed from the initial cycloadducts via loss of thurane. [References: 13]