Aromaticity-Dependent Regioselectivity in Pd(II)-Catalyzed C–H Direct Arylation of Aryl Ureas
作者:Pingping Jiang、Feng Li、Yongbao Xu、Qingwen Liu、Jing Wang、Hong Ding、Renfu Yu、Qifeng Wang
DOI:10.1021/acs.orglett.5b03153
日期:2015.12.4
Palladium-catalyzed C–H direct arylation generally occurs on the ortho-position of directing groups. By comparing meta-arylated products of 2-naphthyl urea to ortho-arylated products of phenyl urea, the ortho- and meta-regioselectivity of aryl ureas were found to depend on the aromaticity of the corresponding aryl substituents. Thus, aromaticity is a new factor which can affect the regioselectivity
Room-Temperature Stille Coupling of Tetraarylstannanes via Palladium-Catalyzed C-H Activation
作者:Dong Xue、Jianliang Xiao、Jing Li、Yu-Xia Liu、Wen-Yong Han、Zun-Ting Zhang、Chao Wang
DOI:10.1055/s-0032-1316581
日期:2012.8
An effective room-temperature Stille cross-coupling of aryl ureas with tetraarylstannanes via palladium-catalyzed C-H bond activation is reported, providing a mild method for direct arylation of aromatic C-H bonds.