Mild and Efficient Michael Addition of Activated Olefins to Indoles Using TBAB as a Catalyst: Synthesis of 3-Substituted Indoles.

Abstract A mild and efficient method for the synthesis of 3‐substituted indoles by treatment of activated olefins with indoles using TBAB as a catalyst afforded the corresponding products in excellent yields. The method is general for the preparation of a wide variety of 3‐substituted indoles.