Intramolecular C–H insertion using NHC–di-rhodium(II) complexes: the influence of axial coordination
作者:Luis F.R. Gomes、Alexandre F. Trindade、Nuno R. Candeias、Pedro M.P. Gois、Carlos A.M. Afonso
DOI:10.1016/j.tetlet.2008.10.054
日期:2008.12
insertion of diazo-acetamides catalysed by di-rhodium(II) complexes can be highly influenced by the axial ligand on the di-rhodium(II) complex. Axially monocoordinated NHC–Rh2(OAc)4 complexes have a distinct reactivity from the parent Rh2(OAc)4 complex affording the cyclisation products in different rates and selectivities. Surprisingly, a new reaction mode emerged when using these complexes which led
在这项工作中,我们表明,二铑(II)配合物催化的重氮-乙酰胺分子内CH插入可以受到二铑(II)配合物上的轴向配体的高度影响。轴向单配位NHC-Rh 2(OAc)4复合物与母体Rh 2(OAc)4复合物具有明显的反应性,从而以不同的速率和选择性提供环化产物。出人意料的是,当使用这些络合物时,出现了一种新的反应模式,从而导致了脱羰途径。