Experimental and Computational Evidence for Gold Vinylidenes: Generation from Terminal Alkynes via a Bifurcation Pathway and Facile C–H Insertions
作者:Longwu Ye、Yanzhao Wang、Donald H. Aue、Liming Zhang
DOI:10.1021/ja2091992
日期:2012.1.11
species is highly reactive and undergoes facile intramolecular C(sp(3))-H insertions as well as O-H and N-H insertions. The formation step for the gold vinylidene is predicted theoretically to be complex with a bifurcated reaction pathway. A pyridine N-oxide acts as a weak base to facilitate the formation of an alkynylgold intermediate, and the bulky BrettPhos ligand in the gold catalyst likely plays a
提议通过两个分子的 BrettPhosAuNTf(2) 协同促进(2-乙炔基苯基)炔烃的简便环异构化,从而以良好的收率提供三环茚。基于机理研究和理论计算,金亚乙烯基最有可能作为反应中间体之一产生。与众所周知的 Rh、Ru 和 W 对应物不同,这种新型金物种具有高度的反应性,并且易于进行分子内 C(sp(3))-H 插入以及 OH 和 NH 插入。理论上预测亚乙烯基金的形成步骤与分叉的反应途径复杂。吡啶N-氧化物充当弱碱以促进炔基金中间体的形成,