Palladium-Catalyzed Methylation of Aryl, Heteroaryl, and Vinyl Boronate Esters
作者:Alexander M. Haydl、John F. Hartwig
DOI:10.1021/acs.orglett.9b00025
日期:2019.3.1
method for the direct methylation of aryl, heteroaryl, and vinyl boronate esters is reported, involving the reaction of iodomethane with aryl-, heteroaryl-, and vinylboronate esters catalyzed by palladium and PtBu2Me. This transformation occurs with a remarkably broad scope and is suitable for late-stage derivatization of biologically active compounds via the boronate esters. The unique capabilities
Iridium-Catalyzed C–H Borylation of Heteroarenes: Scope, Regioselectivity, Application to Late-Stage Functionalization, and Mechanism
作者:Matthew A. Larsen、John F. Hartwig
DOI:10.1021/ja412563e
日期:2014.3.19
from the olefin-bound complex observed during arene borylation to a species containing a bound heteroarene, leading to catalyst deactivation. Studies on the origins of the observed regioselectivity show that borylation occurs distal to N-H bonds due to rapid N-H borylation, creating an unfavorable steric environment for borylation adjacent to these bonds. Computational studies and mechanistic studies show