Photochemical Michael Addition of Indoles to α,β‐Unsaturated Ketones utilizing Arylazo Sulfones as the Photoacid Generators

Abstract

The Michael‐type addition of indoles represents one of the most important C‐C bonds forming reactions at their C‐3 position. Herein, we present a mild, versatile and sustainable protocol for the efficient preparation of β‐indolylketones via a Michael addition between indoles and chalcones or α,β‐unsaturated ketones in the presence of substituted arylazo sulfones as photoacid generators (PAGs).