A Rh-catalyzed intermolecular coupling of diazomalonates with arene C-H bonds is reported. The reaction is initiated by electrophilic C-H activation, which is followed by coupling of the arylrhodium(III) complex with the diazomalonate. In most cases, arenes with oximes, carboxylic acids, and amines as directing groups cross-couple with diazomalonates with excellent regioselectivities and functional
Synthesis of Sterically Congested Polycyclic Aromatic Hydrocarbons: Rhodium(III)-Catalyzed Cascade Oxidative Annulation of Aryl Ketoximes with Diphenylacetylene by Sequential Cleavage of Multiple CH Bonds
作者:Bin Liu、Fang Hu、Bing-Feng Shi
DOI:10.1002/adsc.201400292
日期:2014.8.11
AbstractThe rhodium(III)‐catalyzed oxidative annulations of aryl ketoximes with diphenylacetylene by the cleavage of three CH bonds, one CO bond and the formation of four CC bonds, one CN bonds simultaneously have been developed. This protocol is scalable and compatible with various functional groups, providing an expeditious access to highly congested polycyclic aromatic/heteroaromatic hydrocarbons.magnified image