Cycloaddition of Carbodiimides to Selenazetidines

Significance

A new [2+2] cycloaddition of aromatic and aliphatic isoselenacyanates with dicyclohexyl and diisopropyl carbodiimide to give selenazetidines in very good yields is reported. Although the scope was not investigated, the reaction­ provides an unusual heterocyclic system. A similar system has been prepared from a substituted selenaurea and thiophosgene but in only 45% yield. The structures were confirmed by X-ray crystallographic analysis.