Visible-Light-Mediated α‑Arylation of Enol Acetates Using Aryl Diazonium Salts

Visible light mediates efficiently the α-arylation of enol acetates by aryl diazonium salts under mild conditions using [Ru­(bpy)₃]­Cl₂ as a photoredox catalyst. The broad scope of the reaction toward various diazonium salts and enol acetates was explored. The application of this reaction in the concise synthesis of 2-substituted indoles was demonstrate