Highly Stereoselective Positional Isomerization of Styrenes
<i>via</i>
<scp>Acid‐Catalyzed</scp>
Carbocation Mechanism
作者:Xiao‐Si Hu、Jun‐Xiong He、Ying Zhang、Jian Zhou、Jin‐Sheng Yu
DOI:10.1002/cjoc.202100218
日期:2021.8
The first transition metal-free highly stereoselective positional isomerization of various α-alkyl styrenes through a carbocation mechanism triggered strategy is developed by using Al(OTf)3 as a hidden Brønsted acid catalyst, which provides facile access to value-added acyclic tri- and tetra-substituted alkenes in good yields with high stereoselectivity under mild conditions. The practicality of this
通过使用 Al(OTf) 3作为隐藏的 Brønsted 酸催化剂,通过碳阳离子机制触发的策略开发了第一个无过渡金属的各种 α-烷基苯乙烯的高度立体选择性位置异构化,这为获得增值的无环三-和在温和条件下以高立体选择性和高收率制备四取代烯烃。该协议的实用性由克级合成、高立体选择性、良好的官能团耐受性和简单的操作进一步突出。机理研究支持 Al(OTf) 3充当隐藏的布朗斯台德酸催化剂并形成碳正离子中间体。