Tandem Photocatalysis: An Efficient Synthesis of Multisubstituted Benzimidazoles by Visible-Light-Induced Intramolecular Cyclization and Deprotection

An unprecedented tandem photocatalysis protocol consists of two distinct photocatalytic cycles. This method allows for rapid and efficient construction of multisubstituted benzimidazole derivatives through an intramolecular cyclization and deprotection sequence from diamines under very mild conditions.