Stereoselective Construction of 1,3-Disilylcyclopentane Derivatives by Scandium-Catalyzed [3+2] Cycloaddition of Allylsilanes to β-Silylenones
作者:Kazuhiro Okamoto、Eisuke Tamura、Kouichi Ohe
DOI:10.1002/anie.201404218
日期:2014.9.15
The Sc(OTf)3‐catalyzed [3+2] cycloaddition of allylsilanes to β‐silyl‐α,β‐unsaturated ketones (β‐silylenones) has been developed to form five‐membered syn‐1,3‐disilylketones diastereoselectively through the rearrangement of the silicon substituents on the allylsilane. Stabilization of the carbocation intermediates by a double silicon effect plays a key role in directing the course of the reaction to
烯丙基硅烷的Sc(OTf)3催化的[3 + 2]环加成反应生成β-甲硅烷基-α,β-不饱和酮(β-硅烯酮),可通过非对映选择性地形成五元合成1,3-二甲硅烷基酮。烯丙基硅烷上硅取代基的重排。通过双硅效应使碳正离子中间体稳定,在指导反应过程中比简单的烯丙基化更有利于[3 + 2]环加成途径方面起着关键作用。