Palladium-Catalyzed Asymmetric Decarboxylative Lactamization of γ-Methylidene-δ-valerolactones with Isocyanates: Conversion of Racemic Lactones to Enantioenriched Lactams

Abstract

A palladium-catalyzed asymmetric decarboxylative reaction of racemic gamma-methylidene-delta-valerolactones with aryl isocyanates has been developed to give enantioenriched 3,3-disubstituted 2-piperidones. High enantioselectivity has been achieved by tuning the ester group on substrate and the substituents of phosphoramidite ligand.