Synthesis of highly substituted allylic alcohols by a regio- and stereo-defined CuCl-mediated carbometallation reaction of 3-aryl-substituted secondary propargylic alcohols with Grignard reagents
作者:Xiaobing Zhang、Zhan Lu、Chunling Fu、Shengming Ma
DOI:10.1039/b903769a
日期:——
A highly regio- and stereoselective CuCl-mediated carbometallation reaction of 3-aryl-substituted secondary propargylic alcohols with alkyl, aryl, vinyl or allyl Grignard reagents for the synthesis of fully-substituted allylic alcohols was developed. The R2group from the Grignard reagent was successfully introduced to the 2-position of the propargylic alcohols due to the chelation of metal atom with
开发了一种高度区域选择性和立体选择性的CuCl介导的3-芳基取代的仲炔丙醇与烷基,芳基,乙烯基或烯丙基格氏试剂的碳金属化反应,用于合成全取代的烯丙醇。R 2由于金属原子与羟基氧原子的螯合形成5元金属环中间体,使格氏试剂中的基团成功地引入到炔丙醇的2位,该5元金属环中间体与各种亲电试剂平稳反应,得到立体定义的多取代的烯丙基醇。通过这种方法,光学活性的烯丙醇可以由容易获得的光学活性的炔丙醇制备而没有明显的消旋作用。五元内酯也可以通过碘化烯丙基醇经Pd催化的羰基化反应合成。