Switching the Regioselectivity of Direct C-H Arylation of 1,3-Dimethyluracil
作者:Miroslava Čerňová、Radek Pohl、Michal Hocek
DOI:10.1002/ejoc.200900586
日期:2009.8
An interesting dichotomy in the regioselectivity and mechanism of directC–Harylation of 1,3-dimethyluracil was observed. Its Pd-catalyzed reactions with diverse aryl halides in the absence of CuI lead preferentially to 5-aryluracils, while reactions in the presence of CuI give 6-aryl derivatives as the major products. Cu-mediated reactions (in the absence of a Pd catalyst) proceed with lower efficiency