Synthesis of Enantiopure 1,2-Didehydropyrrolidine, D-Proline, and Oxazoline Derivatives via Staudinger-Aza-Wittig Cyclization of γ-Azido Aldehydes

Abstract

The synthesis of 3-, 3,5- and 3,4,5-substituted prolines 1 and oxazolines 3 from inexpensive D-mannitol, employing the Staudinger-Aza-Wittig cyclization as a key step, is described.