Electrochemical 1,2‐Diarylation of Alkenes Enabled by Direct Dual C–H Functionalizations of Electron‐Rich Aromatic Hydrocarbons
作者:Jing‐Hao Qin、Mu‐Jia Luo、De‐Lie An、Jin‐Heng Li
DOI:10.1002/anie.202011657
日期:2021.1.25
A cobalt‐promoted electrochemical 1,2‐diarylation of alkenes with electron‐rich aromatic hydrocarbons via direct dual C−H functionalizations is described, which employs a radical relay strategy to produce polyaryl‐functionalized alkanes. Simply by using graphite rod cathode instead of platinum plate cathode, chemoselectivity of this radical relay strategy is shifted to the dehydrogenative [2+2+2] cycloaddition
描述了通过直接双CH功能将钴与富电子芳烃进行烯烃促进的电化学1,2-二芳基化反应,该方法采用自由基中继策略来生产聚芳基官能化的烷烃。只需使用石墨棒阴极而不是铂板阴极,这种自由基中继策略的化学选择性就可以通过1,2-二芳基化,环化和脱氢级联反应转变为脱氢[2 + 2 + 2]环加成反应,从而形成复杂的11,12-二氢吲哚[2,3- a ]咔唑。机理研究表明,自由基中继过程的关键步骤是将芳烃转化为芳基sp 2通过使相应的芳基自由基阳离子中间体与碱去质子化,使碳中心自由基杂交。