Development of the radical C–O coupling reaction of phenols toward the synthesis of natural products comprising a diaryl ether skeleton
作者:Kumpei Tanaka、Hiroaki Gotoh
DOI:10.1016/j.tet.2019.05.035
日期:2019.7
atom of phenols. In this study, various radical-generating reagents and conditions were investigated with the aim of developing a short-step construction method of the diaryl ether skeleton by the radical homo-coupling of two phenol molecules. In addition, cross-coupling reactions between radicals of 2,4,6-tri-tert-butylphenol and p-substituted phenol were conducted to synthesize eight C (ortho)–O coupling
天然酚中存在包含二芳基醚骨架的化合物。二芳基醚骨架被认为是通过两种或多种酚的偶联而生物合成的。它是药物和农用化学品的重要结构特征,必须开发在有机合成中构建此类骨架的方法。然而,通过通过酚偶联的合成方法,偶联优先发生在酚的邻位取代的碳原子上。在这项研究中,研究了各种自由基产生剂和条件,目的是通过两个酚分子的自由基均相偶联来开发二芳基醚骨架的短步构建方法。此外,2,4,6-三原子自由基之间的交叉偶联反应进行了丁基丁基苯酚和对位取代苯酚的合成八种C(邻)-O偶联产物。根据结果,采用计算化学方法验证了C(邻位)-O键形成的原因。