Ga(OTf)₃-Promoted Sequential Reactions via Sulfur-Assisted Propargyl-Allenyl Isomerizations and Intramolecular [4 + 2] Cycloaddition for the Synthesis of 1,3-Dihydrobenzo[<i>c</i>]thiophenes

Abstract

A Ga(OTf)(3)-promoted sequential reactions via sulfur-assisted propargyl-allenyl isomerizations and intramolecular [4 + 2] cycloaddition for the synthesis of 1,3-dihydrobenzo[c]thiophenes. As a result of the ready availability of materials and the simple and convenient operation, the type of reaction presented here has potential utility in organic synthesis.