Ligand-Controlled Product Selectivity in Gold-Catalyzed Double Cycloisomerization of 1,11-Dien-3,9-Diyne Benzoates

A synthetic method to prepare tricyclic bridged heptenones and hexenones from gold­(I)-catalyzed double cycloisomerization of 1,11-dien-3,9-diyne benzoates is described. A divergence in product selectivity was achieved by fine-tuning the steric nature of the ligand of the Au­(I) catalyst. In the presence of [MeCNAu­(JohnPhos)]⁺SbF₆^– (JohnPhos = (1,1′-biphenyl-2-yl)-di-<i>tert</i>-butylphosphine) as the catalyst, tandem 1,3-acyloxy migration/metallo-Nazarov cyclization/1,6-enyne addition/Cope rearrangement of the substrate was found to selectively occur to afford the bridged heptenone adduct. In contrast, changing the Au­(I) catalyst to [MeCNAu­(Me₄<i>t</i>BuXPhos)]⁺SbF₆^– (Me₄<i>t</i>BuXPhos = di-<i>tert</i>-butyl­(2′,4′,6′-triisopropyl-3,4,5,6-tetramethyl-[1,1′-biphenyl]-2-yl)­phosphine) was observed to result in the 1,11-dien-3,9-diyne benzoate undergoing a more rapid tandem 1,3-acyloxy migration/metallo-Nazarov cyclization/[4 + 2]-cyclization pathway to give the bridged hexenone derivative