Efficient Coupling Reaction of Quinone Monoacetal with Phenols Leading to Phenol Biaryls
作者:Tohru Kamitanaka、Koji Morimoto、Kohei Tsuboshima、Daichi Koseki、Hitoho Takamuro、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1002/anie.201608013
日期:2016.12.12
phenol biaryls by the cross‐couplings of quinone monoacetals (QMAs) and phenols is reported. The Brønsted acid catalytic system in 1,1,1,3,3,3‐hexafluoro‐2‐propanol was found to be particularly efficient for this transformation. This reaction can be extended to the synthesis of various phenol biaryls, including sterically hindered biaryls, with yields ranging from 58 to 90 % under mild reaction conditions
据报道,通过醌单缩醛(QMA)和酚类的交叉偶联可以简单而有效地合成苯酚联芳基。发现在1,1,1,3,3,3-六氟-2-丙醇中的布朗斯台德酸催化体系对于这种转化特别有效。该反应可以扩展到各种苯酚联芳基的合成,包括空间位阻联芳基,在温和的反应条件下,以高度区域特异性的方式,收率范围为58%至90%。