Studies on the Cu(I)-Catalyzed Regioselective <i>anti</i>-Carbometallation of Secondary Terminal Propargylic Alcohols
作者:Zhan Lu、Shengming Ma
DOI:10.1021/jo0524021
日期:2006.3.31
A highly regioselective Cu(I)-catalyzed anti-carbometallation of secondary terminal propargylicalcohols with 1° alkyl or aryl Grignard reagents affording 2-substituted allylic alcohols was developed. By using this method, optically active allylic alcohols can be prepared from the optically active propargylicalcohols without obvious loss of the enantiopurity. The cyclic organometallic intermediate
Supportedgoldnanoparticlescatalyze the semihydrogenation of alkynes to alkenes with ammonia borane or amine borane complexes in excellent yields and under mild conditions. Internal alkynes provide cis-alkenes, making this protocol an attractive alternative of the classical Lindlar's hydrogenation.