Utilizing the dramaticacceleratingeffect of 2-aminophenols, we developed a copper-catalyzed system for the selective synthesis of di- and triphenylamines. In addition, N- and O-arylation could be achieved in coupling reactions between 2-aminophenol and nitroaryl halides.
Copper-Catalyzed Selective Arylations of Benzoxazoles with Aryl Iodides
作者:Donghae Kim、Kwangho Yoo、Se Eun Kim、Hee Jin Cho、Junseong Lee、Youngjo Kim、Min Kim
DOI:10.1021/acs.joc.5b00019
日期:2015.4.3
A copper-catalyzed direct ring-opening double N-arylation of benzoxazoles with aryl iodides has been developed. The present system exhibits high selectivity despite competition from C-arylation. The selectivity between ring-opening N-arylation and C-arylation was controlled by the choice of reaction vessel. The nitrile bound bis(triphenylphosphine)copper cyanide was identified as the active catalytic species for both reactions, and when combined with a nitrile-containing solvent, enhanced the reaction efficiency.