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Metal-Free Photochemical Radical Cyclization for the Synthesis of Pyrrolo[3,2-c]-quinolines with One-Carbon Unit.

An efficient and environmentally-friendly method for carbon-centered radical cyclization of olefins via HAT process to afford pyrrolo[3,2-c]-quinolines, oxindoles and quinoline-2,4-diones is described. The transformation features good functional group tolerance, broad substrate scope, high atom economy, no need for transition metal or high temperature. In addition, a strategy about the generation of valuable one-carbon units by means of aryldiazonium salts via visible light photoredox catalysis is proposed.