Enantioselective Synthesis of Polycyclic Indole Derivatives Based on aza-Morita–Baylis–Hillman Reaction

A chiral phosphine-catalyzed asymmetric aza-Morita–Baylis–Hillman reaction between indole-derived sulfonyl imines and bis­(3-chlorophenyl)­methyl acrylate has been developed, giving the desired adducts in good yields and enantiomeric excess values along with the further transformations to polycyclic indoles such as dihydropyrido­[1,2-a]­indole and dihydropyrazino­[1,2-a]­indole skeleton.