Mechanistic Origins of Regioselectivity in Cobalt-Catalyzed C(sp2)-H Borylation of Benzoate Esters and Arylboronate Esters
作者:Tyler P. Pabst、Linda Quach、Kaitlyn T. MacMillan、Paul J. Chirik
DOI:10.1016/j.chempr.2020.11.017
日期:2021.1
Synthetic and mechanistic investigations into the C(sp2)-H borylation of various electronically diverse arenescatalyzed by bis(phosphine)pyridine (iPrPNP) cobalt complexes are reported. Borylation of various benzoate esters and arylboronate esters gave remarkably high selectivities for the position para to the functional group; in both cases, this regioselectivity was found to override the ortho-to-fluorine
Fluorodesilylations of fluorophenyltrimethylsilanes with elemental fluorine: discovery of a novel 1,2-migration of the trimethylsilyl group
作者:Alison M. Stuart、Paul L. Coe、David J. Moody
DOI:10.1016/s0022-1139(98)00118-3
日期:1998.3
Although the main products in all of the fluorinations were the fiuorodesilylated product, the reactions were not totally regioselective and some competing ftuorodeprotonation also occurred in the reactions of 2-fluoro-and 2,4-difluoro-phenyltrimethylsilanes. The role of protic acids and Lewis acids in particular triflic acid, trifluoroacetic acid and boron trifluoride in a variety of co-solvents, respectively