Chemoselective Suzuki-Miyaura Coupling of Bromophenyl-Substituted Bromoallenes with Arylboronic Acids
摘要:
Developing highly chemoselective Suzuki-Miyaura coupling reactions is of great value in the synthetic chemistry. Here we report the results of palladium-catalyzed reaction of bromoallenes containing an aryl bromide moiety with arylboronic acids. It is found that the C-Br insertion exclusively takes place on bromoallene rather than on the benzene ring. Theoretical calculations demonstrate that the corresponding oxidative addition intermediate has a much lower free energy.
Tri(<i>o</i>-tolyl)phosphine for highly efficient Suzuki coupling of propargylic carbonates with boronic acids
作者:Junzhe Xiao、Hongwen Luo、Shan Huang、Hui Qian、Shengming Ma
DOI:10.1039/c8cc04186e
日期:——
A highlyefficient catalytic system consisting of Pd2(dba)3·CHCl3 and tri(o-tolyl)phosphine has been identified for the coupling of propargylic carbonates with different types of organo boronic acids at room temperature. Excellent central-to-axial chirality transfer was also demonstrated.