Enantioselective Halocyclization Using Reagents Tailored for Chiral Anion Phase-Transfer Catalysis
摘要:
A chiral anion phase-transfer system for enantioselective halogenation is described. Highly insoluble, ionic reagents were developed as electrophilic bromine and iodine sources, and application of this system to o-anilidostyrenes afforded halogenated 4H-3,1-benzoxazines with excellent yield and enantioselectivity.
Enantioselective Syntheses of 4<i>H</i>-3,1-Benzoxazines via Catalytic Asymmetric Chlorocyclization of <i>o</i>-Vinylanilides
作者:Qinxia Xie、Hai-Jiao Long、Qiong-Yin Zhang、Pei Tang、Jun Deng
DOI:10.1021/acs.joc.9b02395
日期:2020.2.21
The catalyticasymmetric halocyclization of alkene is a powerful and straightforward strategy for the synthesis of chiral heterocyclic compounds. Herein, an effective approach to chiral benzoxazine derivatives through organocatalyzed chlorocyclization of o-vinylanilides was reported. This method provides facile access to a series of chiral benzoxazines in good to excellent yields (up to 99% yield)