A cationic gold(I) complex bearing a semihollow-shaped triethynylphosphine ligand efficiently catalyzed the 7-exo-dig cyclization of silyl enol ethers with an ω-alkynic substituent. The reaction gave various methylenecycloheptane derivatives with an exo- or endocyclic carbonyl group. The protocol was applicable not only to cyclic substrates that form bicyclic frameworks but also to acyclic ones with or without substituents in a carbon chain tether.

中文翻译：

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三乙炔膦-金配合物催化乙炔基甲硅烷基醚的7 -Exo-Dig环化反应构建亚甲基环庚烷骨架

阳离子金（I）络合物轴承semihollow形triethynylphosphine配体有效地催化7-外型-挖的甲硅烷基烯醇醚的环化用ω-alkynic取代基。反应得到具有外-或内环羰基的各种亚甲基环庚烷衍生物。该方案不仅适用于形成双环骨架的环状底物，而且适用于在碳链束缚带中具有或不具有取代基的无环骨架。