Asymmetric Formal Vinylogous Iminium Ion Activation for Vinyl-Substituted Heteroaryl and Aryl Aldehydes
作者:Xin-Yue Gao、Ru-Jie Yan、Ben-Xian Xiao、Wei Du、Łukasz Albrecht、Ying-Chun Chen
DOI:10.1021/acs.orglett.9b03794
日期:2019.12.6
secondary amine and underwent asymmetric [3 + 2] cycloaddition reactions with N-trifluoroethyl-substituted isatin imines, furnishing a variety of spirooxindoles incorporating a 3,2′-pyrrolidine motif with excellent stereoselectivity. In addition, this strategy has been successfully expanded to a number of vinyl-substituted electron-rich heteroaryl aldehydes and even some specific aryl aldehydes.
可以通过形成手性仲胺催化的正式的
乙烯基亚胺离子中间体,并通过与N-三
氟乙基取代的异
亚胺亚胺进行不对称[3 + 2]环加成反应,从而制得与
糠醛相连的
乙烯基,从而提供各种掺入具有出色立体选择性的3,2'-
吡咯烷基序。另外,该策略已经成功地扩展到许多
乙烯基取代的富电子的杂芳基醛,甚至某些特定的芳基醛。