Highly Stereoselective Domino Oxa‐Michael/Aza‐Michael/Cyclization: Synthesis of Bicyclic Lactams and Spiroox­indole Skeleton

Abstract An efficient diastereoselective access to all carbon‐substituted oxazolo‐pyrrolidinones, including a quaternary carbon stereocenter, is described. This was achieved by using a domino process between hydroxy halogenoamides and various Michael acceptors. This strategy provided good to high yield and selectivity. Application to the diastereoselective synthesis of an enantioenriched spirooxindole skeleton in high yield and selectivity is also presented.