Photo-Driven Synthesis of C6-Polyfunctionalized Phenanthridines from Three-Component Reactions of Isocyanides, Alkynes, and Sulfinic Acids by Electron Donor-Acceptor Complex.

A novel and efficient photoinduced synthesis of C6-polyfunctionalized phenanthridines from three-component reactions of isocyanides, alkynes and sulfinic acids was developed. The reactions generated the corresponding products with high selectivity through the photochemical activity of the formed electron donor-acceptor (EDA) complex during the reaction via a radical tandem process under mild conditions.