Substituent-induced regioselective hydroxylation of the aromatic C-H bond on naphthalene with metachloroperbenzoic acid catalyzed by F<sub>20</sub>
TPPMnCl
作者:Chang-Di Chen、Wen-Bing Sheng、Guo-Jun Shi、Can-Cheng Guo
DOI:10.1002/poc.3012
日期:2013.1
The regioselective hydroxylation of the aromatic C–H bond on a series of naphthalenes with different β‐substituent R (R = H, Me, Et, i‐Pr, OMe, COOH, Br, etc.) was studied, and the substituent effect on the regioselectivity was investigated. The electron‐donating substituent afforded the aromatic C–H bond hydroxylation at the 1α position with more than 80% selectivity, while the electron‐withdrawing
一系列具有不同β取代基R的萘上芳族C–H键的区域选择性羟基化(R = H,Me,Et,i-Pr,OMe,COOH,Br等),并研究了取代基对区域选择性的影响。给电子取代基在1α位提供芳香族C–H键羟基化,选择性超过80%,而吸电子取代基在4α位提供芳香族C–H键羟基化,β选择性超过60%四(五氟苯基)卟啉锰(III)催化的间氯过苯甲酸羟基化的预取代萘。研究表明,取代基的空间和电子效应似乎在决定区域选择性方面起着重要作用,在当前情况下,电子效应比取代基的空间效应更为重要。这些研究可能为通过阳离子中间体的芳香族C–H键羟基化的逐步机理提供更多证据。版权所有©2012 John Wiley&Sons,Ltd.