Construction of All-Carbon Quaternary Stereocenters by Scandium-Catalyzed Intramolecular C–H Alkylation of Imidazoles with 1,1-Disubstituted Alkenes
作者:Shao-Jie Lou、Zhenbo Mo、Masayoshi Nishiura、Zhaomin Hou
DOI:10.1021/jacs.9b12503
日期:2020.1.22
The exo-selective C-H cycloaddition of imidazoles to 1,1-disubstituted alkenes has been achieved for the first time by using half-sandwich scandium catalysts. A wide range of imidazole compounds bearing various 1,1-disubstituted aliphatic alkenes, styrenes, dienes and enynes have been selectively converted in high yields to the corresponding bicyclic imidazole derivatives bearing -all-carbon-substituted
通过使用半夹心钪催化剂,首次实现了咪唑与 1,1-二取代烯烃的外选择性 CH 环加成反应。大量含有各种 1,1-二取代脂肪族烯烃、苯乙烯、二烯和烯炔的咪唑化合物已被选择性地以高产率转化为相应的带有 -全碳取代四元立体中心的双环咪唑衍生物。通过使用手性半夹心钪催化剂,还实现了具有高水平对映选择性的不对称外选择性环化。