Efficient catalysis of Ullmann-type arylation reactions by a novel trinuclear copper(I) complex with a chelating tricarbene ligand
作者:Cristina Tubaro、Andrea Biffis、Elena Scattolin、Marino Basato
DOI:10.1016/j.tet.2008.02.092
日期:2008.5
A novel trinuclear copper(I) complex with a chelating tricarbene ligand is shown to be an efficient catalyst for the arylation of different classes of compounds containing N–H or O–H functions. Different kinds of azole rings (pyrazole, imidazole, 1,2,4-triazole) can be arylated with comparable efficiencies at relatively mild temperatures (100 °C). The catalyst activates aryl iodides, bromides and even
一种具有螯合三卡宾配体的新型三核铜(I)配合物被证明是芳构化包含NH或OH功能的不同种类化合物的有效催化剂。在相对温和的温度(100°C)下,可以以相当的效率使不同种类的唑环(吡唑,咪唑,1,2,4-三唑)芳基化。催化剂活化芳基碘化物,溴化物,甚至氯化物以进行反应。观察到芳基取代基的性质对反应产率的异常强烈的影响。尽管明显降低了酰胺的催化效率,但合成方案可以扩展到其他底物类别,例如苯酚和酰胺。