New Pathways for the Dual Gold-Catalyzed Cyclization of Diynes

Abstract

The reaction of thiophene-based diynes with dual-activation gold catalysts can provide cyclobutene derivatives or different polycycles by selective C−H insertion reactions. Also, the first σ,π-digold diyne complex was obtained in a stoichiometric reaction, providing insight into the dual activation mechanism. The new products were unambiguously identified by X-ray single-crystal structure analysis.