Divergence between Organometallic and Single-Electron-Transfer Mechanisms in Copper(II)-Mediated Aerobic C–H Oxidation
作者:Alison M. Suess、Mehmed Z. Ertem、Christopher J. Cramer、Shannon S. Stahl
DOI:10.1021/ja4026424
日期:2013.7.3
Copper(II)-mediated C-H oxidation is the subject of extensive interest in synthetic chemistry, but the mechanisms of many of these reactions are poorly understood. Here, we observe different products from Cu(II)-mediated oxidation of N-(8-quinolinyl)benzamide, depending on the reaction conditions. Under basic conditions, the benzamide group undergoes directed C-H methoxylation or chlorination. Under
铜 (II) 介导的 CH 氧化是合成化学中广泛关注的主题,但对其中许多反应的机制知之甚少。在这里,我们观察到来自铜(II)介导的 N-(8-喹啉基)苯甲酰胺氧化的不同产物,具体取决于反应条件。在碱性条件下,苯甲酰胺基团发生定向的 CH 甲氧基化或氯化。在酸性条件下,喹啉基团发生非定向氯化。实验和计算机制研究表明,前一种条件下的有机金属 CH 活化/功能化机制和后一种条件下的单电子转移机制。这种罕见的发散性观察,