Visible-light photocatalysed Synthesis of Bioactive Benzo[b]thiophenes via Intramolecular C−S Bond Formation

Abstract

Visible light driven synthesis of substituted benzo[b]thiophenes from phenylethenethiol under an air atmosphere at room temperature is reported, using eosin Y as an organophotoredox catalyst by intramolecular C−S bond formation. This process accepts a wide range of functional groups tolerance and generates benzo[b]thiophenes under highly environmentally benign conditions via transition-metal-free organic photoredox catalysis.