Palladium-Catalyzed Regioselective C–H Functionalization of Arenes Substituted by Two <i>N</i>-Heterocycles and Application in Late-Stage Functionalization
作者:Da-Wei Yin、Gang Liu
DOI:10.1021/acs.joc.8b00322
日期:2018.4.6
Pd-catalyzed regioselective C–H activation method that is used for C–H deuteration, carbonylation, halogenation, and oxidation of arene substrates substituted by two N-heterocycles. When conducted in acetic acid (AcOH), these reactions occur at the five-membered palladacycle sites, whereas they switch to the six-membered palladacycle sites in trifluoroacetic acid (TFA). This controllable regioselective C–H
本文报道了一种钯催化的区域选择性C–H活化方法,用于C–H氘代,羰基化,卤化和氧化被两个N-杂环取代的芳烃底物。当在乙酸(AcOH)中进行时,这些反应发生在五元的Palladacycle位置,而它们切换到三氟乙酸(TFA)中的六元的Palladacycle位置。这种可控的区域选择性C–H激活被用于生物活性分子的后期功能化。一项机理研究表明,区域选择性是通过布朗斯台德酸-刘易斯碱相互作用和电子效应(在TFA中)以及palladacycle中间体的不同动力学稳定性(在AcOH中)实现的。