One‐Pot Synthesis of Bis‐sulfonyl Dibenzofurans via K₂CO₃‐Mediated Benzannulation of α‐Sulfonyl o‐Hydroxyacetophenones with 1,4‐Dichloro‐2‐butyne

Abstract

A one‐pot synthesis method for functionalized bis‐sulfonyl dibenzofurans was developed under an air atmosphere using potassium carbonate–mediated benzannulation of diversified α‐sulfonyl o‐hydroxyacetophenones with 1,4‐dichloro‐2‐butyne. A plausible mechanism was proposed and discussed. This method provides intermolecular double α‐propargylation, sulfonyl migration, and intramolecular ring‐closure via the formation of one carbon–oxygen single (C–O) bond, one carbon–sulfur single (C–S) bond, and two carbon–carbon (C=C) double bonds.