Iridium-Catalyzed Borylation of Secondary Benzylic C–H Bonds Directed by a Hydrosilane
摘要:
Most functionalizations of C-H bonds by main-group reagents occur at aryl or methyl groups. We describe a highly regioselective borylation of secondary benzylic C-H bonds catalyzed by an iridium precursor and 3,4,7,8-tetramethyl-1,10-phenanthroline as the ligand. The reaction is directed to the benzylic position by a hydrosilyl substituent. This hydrosilyl directing group is readily deprotected or transformed to other functional groups after the borylation reaction, providing access to a diverse set of secondary benzylboronate esters by C-H borylation chemistry.
Regio- and Stereoselective Cobalt-Catalyzed Hydroboration of Vinylcyclopropanes to Access Homoallylic Boronates
作者:Dongpo Lu、Chenhui Chen、Lixuan Zheng、Jiale Ying、Zhan Lu
DOI:10.1021/acs.organomet.2c00592
日期:——
Herein, a cobalt-catalyzed hydroboration of vinylcyclopropanes was reported to access the corresponding homoallylic boronates with excellent regio- and stereoselectivity. This reaction features a broad substrate scope and could be carried out on a gram scale. The possible mechanism and models for selectivity have been proposed.