Construction of Methylenecycloheptane Frameworks through 7<i>-Exo-Dig</i> Cyclization of Acetylenic Silyl Enol Ethers Catalyzed by Triethynylphosphine−Gold Complex
作者:Hideto Ito、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1021/ol101860j
日期:2010.10.1
A cationic gold(I) complex bearing a semihollow-shaped triethynylphosphine ligand efficiently catalyzed the 7-exo-dig cyclization of silylenolethers 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