Enantioselective CH Bond Functionalization Triggered by Radical Trifluoromethylation of Unactivated Alkene
作者:Peng Yu、Jin-Shun Lin、Lei Li、Sheng-Cai Zheng、Ya-Ping Xiong、Li-Jiao Zhao、Bin Tan、Xin-Yuan Liu
DOI:10.1002/anie.201405401
日期:2014.10.27
An asymmetric unactivated alkene/CH bond difunctionalization reaction for the concomitant construction of CCF3 and CO bonds was realized by using a Cu/Brønsted acid cooperative catalytic system, thus providing facile access to valuable chiral CF3‐containing N,O‐aminals with excellent regio‐, chemo‐, and enantioselectivity. Mechanistic studies revealed that this reaction may proceed by an unprecedented
不对称非活化烯烃/ C 为C的伴随建筑H键difunctionalization反应 CF 3和C O键是通过使用Cu /布朗斯台德酸催化的合作系统,从而提供了有价值的手性CF容易访问实现3含Ñ ,O-缩醛胺具有出色的区域,化学和对映选择性。机制研究表明,该反应可以通过涉及未活化烯烃的活化和自由基三氟甲基化以引发的C后续的对映选择性的官能化了前所未有的1,5-氢化移继续H键。对照实验还表明,手性布朗斯台德酸起多种作用,不仅控制立体选择性,而且还通过激活Togni试剂提高了反应速率。