Catalytic Enantioselective Synthesis of α-Substituted Secondary Allylic Alcohols from Terminal Alkynes and Aldehydes via Vinylaluminum Reagents
作者:Ravindra Kumar、Hiroki Kawasaki、Toshiro Harada
DOI:10.1002/chem.201303619
日期:2013.12.23
highly enantioselective synthesis of α‐substituted allylic alcohols has been developed starting from readily available terminal alkynes and aldehydes and proceeding via vinylaluminum reagents (see scheme, dppp=1,3‐bis(diphenylphosphino)propane). The use of Me2AlH is essential in the Ni‐catalyzed hydroalumination step to generate vinylaluminum reagents that cannot reduce the aldehyde.
一锅法:从容易获得的末端炔烃和醛开始,再通过乙烯基铝试剂,开发出一种高度对映选择性合成α-取代的烯丙醇的通用方法(参见方案,dppp = 1,3-双(二苯基膦基)丙烷)。在Ni催化的氢化铝化步骤中,必须使用Me 2 AlH来生成不能还原醛的乙烯基铝试剂。