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
The axial coordination of N-heterocycliccarbene ligands onto dirhodium(II) complexes was examined, together with its role in the intramolecular C-H insertion reactions of α-diazoacetamides. The formation of a decarbonylated product occurs by a free-carbene mechanism in which the structures of the catalyst and the acetamide play a decisive role. carbenoids - carbenecomplexes - catalysis - diazo compounds