A simple and efficient direct radical C-2 arylation of 3-aminochromone derivatives with aryl hydrazine is described. The aryl hydrazine acts as an initiator and source for the aryl radicalvia the cleavage of the C–N bond of aryl hydrazine. The reaction proceeds via a base-promoted single electron transfer (SET) pathway. The aryl radical abstracts a single electron from 3-aminochromone, which generates
N-Heterocyclic Carbene-Catalyzed Intramolecular Aldehyde−Nitrile Cross Coupling: An Easy Access to 3- Aminochromones
作者:Seenuvasan Vedachalam、Jing Zeng、Bala Kishan Gorityala、Meraldo Antonio、Xue-Wei Liu
DOI:10.1021/ol9026232
日期:2010.1.15
An immense effort has been made to develop an efficient strategy for the carbon-carbon bond formation between aldehyde and nitrile intramolecularly using an N-heterocyclic carbene catalyst to derive 3-aminochromone derivatives in good to excellent yields (80-95%).