作者:Kyalo Stephen Kanyiva、Florian Löbermann、Yoshiaki Nakao、Tamejiro Hiyama
DOI:10.1016/j.tetlet.2009.02.195
日期:2009.7
Nickel/Lewis acid binary catalysis is found effective to direct regioselective alkenylation of imidazoles through C–H bond activation and stereoselective insertion of alkynes. Use of P(t-Bu)3 as a ligand allows exclusive regioselective C(2)-alkenylation, while PCyp3 is found effective for C(5)-alkenylation of C(2)-substituted imidazoles. The reaction demonstrates a broad scope of imidazoles and internal
发现镍/路易斯酸二元催化可通过C–H键活化和炔烃的立体选择性插入,有效地指导咪唑的区域选择性烯基化。P(t- Bu)3作为配体的使用允许排他性区域选择性C(2)-烯基化,而PCyp 3被发现对C(2)-取代的咪唑的C(5)-烯基化有效。该反应表明,咪唑和内部炔烃的范围很广,可以适度地以良好的收率高区域和立体选择性地产生三取代的乙烯。