Discovery of an iridacycle catalyst with improved reactivity and enantioselectivity in the hydrogenation of dialkyl ketimines
作者:York Schramm、Fabiola Barrios-Landeros、Andreas Pfaltz
DOI:10.1039/c3sc50587a
日期:——
Catalytically active iridacycles are formed by cyclometalation of acetophenone imines with Ir–PHOX complexes under hydrogen atmosphere. These complexes show unusually high reactivity and enantioselectivity in the hydrogenation of alkyl methyl ketimines. The structure of the cyclometalated imine has a strong effect on the conversion and enantiomeric excess.
在氢气环境下,Ir-PHOX 复合物与苯乙酮亚胺发生环甲基化反应,形成了具有催化活性的铱环。在烷基甲基酮亚胺的氢化反应中,这些配合物显示出异常高的反应活性和对映选择性。环甲基化亚胺的结构对转化率和对映体过量有很大影响。