Cobalt-Catalyzed Monoselective <i>Ortho</i>-C–H Functionalization of Carboxamides with Organoaluminum Reagent
作者:Huiqiao Wang、Sheng Zhang、Zhiqiang Wang、Minghui He、Kun Xu
DOI:10.1021/acs.orglett.6b02860
日期:2016.11.4
A simple triphenylphosphine-ligated cobalt catalyst is reported for the direct ortho-C-H methylation and ethylation of aromatic, heteroaromatic, alkenyl, and even aliphatic carboxamides with inexpensive organoaluminum reagents in the presence of a cheap alkyl chloride as oxidant. This reaction shows monoselectivity in contrast with previously established C-H methylation methodologies.
据报道,简单的三苯基膦连接的钴催化剂可在廉价的烷基氯化物作为氧化剂存在下,通过廉价的有机铝试剂直接将芳族,杂芳族,烯基,甚至脂肪族羧酰胺进行邻位甲基化和乙基化。与先前建立的CH甲基化方法相比,该反应显示出单选择性。