Tunable Dehydrogenative Amidation versus Amination Using a Single Ruthenium-NHC Catalyst
作者:Xiaoke Xie、Han Vinh Huynh
DOI:10.1021/acscatal.5b00588
日期:2015.7.2
characterized. Complex 1 bearing the 1,3-dibenzylbenzimidazolin-2-ylidene ligand is able to selectively catalyze both dehydrogenative amidation, mono-, and diamination (N-alkylation) through coupling of simple alcohols with amines effectively yielding a range of amides and secondary and tertiary amines. Selectivity is achieved by controlling the fate of the common hemiaminal intermediate, which in turn can be
[RuCl(p- cymene)(bimy)(PPh 3)] PF 6(bimy =苯并咪唑啉-2-亚基)类型的混合N-杂环卡宾(NHC)/膦配合物已经合成并充分表征。带有1,3-二苄基苯并咪唑啉-2-亚甲基配体的配合物1通过简单的醇与胺的偶联,能够选择性地催化脱氢酰胺化,单价和全价化(N-烷基化),从而有效地产生一系列酰胺以及仲和叔胺胺类。选择性是通过控制常见的半胱氨酸中间体的命运来实现的,而该命运又可以简单地受到碱和溶剂的选择的影响。