Organocatalytic formal [2+2] cycloaddition initiated by vinylogous Friedel–Crafts alkylation: enantioselective synthesis of substituted cyclobutane derivatives
作者:Guo-Jian Duan、Jun-Bing Ling、Wei-Ping Wang、Yong-Chun Luo、Peng-Fei Xu
DOI:10.1039/c3cc41785a
日期:——
An organocatalytic vinylogous Friedel-Crafts alkylation-initiated formal [2+2] cycloaddition was successfully developed based on tandem iminium-enamine activation of enals. Transformable pyrrole-functionalized cyclobutanes with three contiguous stereocenters were readily obtained with excellent levels of regio-, diastereo- and enantiocontrol.
基于串联的亚胺-烯胺活化的烯类,成功开发了有机催化乙烯基弗里德尔-克来福特烷基化引发的正式[2 + 2]环加成反应。具有三个连续的立体中心的可转化的吡咯官能化的环丁烷很容易获得,并具有极好的区域,非对映和对映体控制水平。