Use of a Semihollow-Shaped Triethynylphosphane Ligand for Efficient Formation of Six- and Seven-Membered Ring Ethers through Gold(I)-Catalyzed Cyclization of Hydroxy-Tethered Propargylic Esters
作者:Hideto Ito、Ayumi Harada、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1002/adsc.201200949
日期:2013.3.11
The formation of six‐ and seven‐membered ring ethers from hydroxy‐tethered propargylic esters was efficiently catalyzed by a cationic gold(I) complex with a semihollow‐shaped triethynylphosphane ligand. This gold catalysis showed a tolerance toward the reactions of primary, secondary, and tertiary alcohol substrates with various substitution patterns. A sterically congested 2,2,6,6‐tetraalkyl‐substituted
带有半空心形状的三乙炔基膦配体的阳离子金(I)配合物可有效地催化羟基拴住的炔丙基酯形成六元和七元环醚。这种金催化显示出对具有各种取代方式的伯,仲和叔醇底物反应的耐受性。得到了有用的收率的2,2,6,6-四烷基取代的四氢吡喃衍生物以及6,6-和7,6-稠合的双环二醚的空间拥挤状态。此外,金催化还适用于磺酰胺连接的炔丙基酯反应生成哌啶衍生物。