A new air-stable Si,S-chelating ligand for Ir-catalyzed directed <i>ortho</i> C–H borylation
作者:Jiao Jiao、Wenzheng Nie、Peidong Song、Pengfei Li
DOI:10.1039/d0ob02335c
日期:——
reaction with a broad substrate scope. This study provides the first example of using a sulfur-containing ligand in the catalytic C–H borylation process. It provides a rapid, efficient, and economicalmethod for the preparation of organoboron compounds.
Iridium-Catalyzed, Substrate-Directed C–H Borylation Reactions of Benzylic Amines
作者:Andrew J. Roering、Lillian V. A. Hale、Phillip A. Squier、Marissa A. Ringgold、Emily R. Wiederspan、Timothy B. Clark
DOI:10.1021/ol301635x
日期:2012.7.6
The iridium-catalyzedarene C–H borylation reaction of benzylic amines has been developed, which inverts the typical steric-controlled product distribution to provide ortho-substituted boronate esters. Picolylamine was found to be an ideal ligand to replace 4,4′-di-tert-butylbipyridine to induce the directing effect. Preliminary experiments are consistent with a mechanism involving dissociation of
N,B-Bidentate Boryl Ligand-Supported Iridium Catalyst for Efficient Functional-Group-Directed C–H Borylation
作者:Guanghui Wang、Li Liu、Hong Wang、You-Song Ding、Jing Zhou、Shuai Mao、Pengfei Li
DOI:10.1021/jacs.6b11867
日期:2017.1.11
Convenient silylborane precursors for introducing N,B-bidentate boryl ligands onto transition metals were designed, prepared, and employed in ready formation of irdium(III) complexes via Si-B oxidative addition. A practical, efficient catalytic ortho-borylation reaction of arenes with a broad range of directing groups was developed using an in situ generated catalyst from the silylborane preligand 3c and [IrCl(COD)](2).
Role of Hemilabile Diamine Ligands in the Amine-Directed C–H Borylation of Arenes
作者:Lillian V. A. Hale、Kathryn A. McGarry、Marissa A. Ringgold、Timothy B. Clark
DOI:10.1021/om5007837
日期:2015.1.12
A study of the role played by the bidentate ligand used in amine-directed CH borylation is described. Both reaction conversion and selectivity were significantly impacted when steric congestion and electronic perturbations of the bidentate diamine ligand were made, but a more significant influence was imparted by reducing the bite angle of the ligand. N-Benzylaminopyridine was identified as a general ligand that improves both selectivity and yield for most problematic substrates previously reported with picolylamine as ligand.