Huisgen click cycloadditions from a copper(II)-tren precatalyst without external sacrificial reductant
作者:Lydie Harmand、Marie-Hélène Lescure、Nicolas Candelon、Mathieu Duttine、Dominique Lastécouères、Jean-Marc Vincent
DOI:10.1016/j.tetlet.2012.01.035
日期:2012.3
The copper(II) complex [Cu(C18(6)tren)](Br)(2), 2, is an efficient precatalyst for the Huisgen 'click' cycloaddtion which can be used at low loading without the requirement of an external sacrificial reductant such as sodium ascorbate. EPR studies support the in situ reduction of 2 by the alkyne to generate a reactive copper(1) catalyst. (C) 2012 Elsevier Ltd. All rights reserved.