Construction of Enantioenriched 9<i>H</i>-Fluorene Frameworks via a Cascade Reaction Involving Remote Vinylogous Dynamic Kinetic Resolution
作者:Cui-Xia Hu、Lin Chen、Di Hu、Xue Song、Zhi-Chao Chen、Wei Du、Ying-Chun Chen
DOI:10.1021/acs.orglett.0c03372
日期:2020.11.20
transmission along the aromatic system, thus enabling dynamic kinetic resolution via a traditional reversible deprotonation–protonation process. Enantioenriched 9-substituted 9H-fluorene frameworks were finally constructed through an asymmetric vinylogous Michael addition to nitroolefins, followed by a cascade cyclization and oxidative aromatization process, under the catalysis of a chiral bifunctional thiourea-tertiary
3-取代的1-茚满酮的α,α-二氰基烯烃的苄基CH基团可以通过沿芳族体系传输而被显着活化,从而通过传统的可逆去质子化-质子化过程实现动态动力学拆分。最终通过在手性双官能硫脲-叔胺的催化下,将不对称乙烯基迈克尔加成至硝基烯烃,然后进行级联环化和氧化芳构化过程,来构建对映体富集的9-取代的9 H-芴骨架。