Au-Catalyzed Oxidative Arylation: Chelation-Induced Turnover of <i>ortho</i>-Substituted Arylsilanes
作者:Matthew P. Robinson、Guy C. Lloyd-Jones
DOI:10.1021/acscatal.8b02302
日期:2018.8.3
ortho-Substituted aryl silanes have previously been found to undergo much slower Au-catalyzed intermolecular arylation than their m,p-substituted isomers, with many examples failing to undergo turnover at all. A method to indirectly quantify the rates of C–Si auration of o-substituted aryl silanes, under conditions of turnover, has been developed. All examples are found to undergo very efficient C–Si
先前已经发现,邻取代的芳基硅烷比它们的m,p-取代的异构体经历更慢的Au催化的分子间芳基化,许多例子根本没有进行转换。已经开发出一种在周转条件下间接量化邻位取代的芳基硅烷的C-Si升温速率的方法。发现所有实例均经过非常有效的C–Si酸化,表明邻位取代基抑制了随后的C–H酸化。一个简单的Ar–Au构象模型表明,螯合可以促进C–H的空化。示出了一系列邻官能化的芳基硅烷经历有效的芳基化。