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.
BH
<sub>3</sub>
⋅ Me
<sub>2</sub>
S: An Alternative Hydride Source for NiH‐Catalyzed Reductive Migratory Hydroarylation and Hydroalkenylation of Alkenes
作者:Jiandong Liu、Hegui Gong、Shaolin Zhu
DOI:10.1002/ejoc.202100005
日期:2021.3.12
The inexpensive borane dimethylsulfide (BMS) complex was found to be an efficient hydride source for nickel‐hydride catalyzed migratory hydrofunctionalization. Using BMS, migratory hydroarylation and migratory hydroalkenylation were achieved with broad substrate scope under mild conditions.
Rapid Access to Highly Functionalized Alkyl Boronates by NiH‐Catalyzed Remote Hydroarylation of Boron‐Containing Alkenes
作者:Yao Zhang、Bo Han、Shaolin Zhu
DOI:10.1002/anie.201907185
日期:2019.9.23
selective functionalization of relatively simple and readily accessible precursors to produce highlyfunctionalizedalkylboronates is a synthetically useful process. Herein we report a NiH-catalyzed remotehydroarylation process that can, through a synergistic combination of chain walking and subsequent cross-coupling, introduce an aryl group at the adjacent carbon atom of alkylboronates under mild