A highly efficient cobalt-catalyzed deuterogenolysis of diboron: Synthesis of deuterated pinacolborane and vinylboronates
摘要:
Highly efficient hydrogenolysis and deuterogenolysis of diboron compounds have been realized by the use of a cobalt catalyst, affording TON up to 48201. Furthermore, a one-pot two-step procedure comprising sequential deuterogenolysis of diboron and deuteroboration of alkynes under the same cobalt catalyst has been developed for the efficient, atom-economical synthesis of deuterated vinylboronates with high deuterium incorporation and excellent regio- and stereoselectivity. (C) 2019 Elsevier Ltd. All rights reserved.
Base-free nickel-catalyzed hydroboration of simple alkenes with bis(pinacolato)diboron in an alcoholic solvent
作者:Jiang-Fei Li、Zhen-Zhong Wei、Yong-Qiu Wang、Mengchun Ye
DOI:10.1039/c7gc02282d
日期:——
A base-free nickel-catalyzed hydroboration of unreactive simple alkenes with bis(pinacolato)diboron using methanol as the hydride source under mild conditions has been developed.
Organoboron compounds are powerful precursors of value-added organic compounds in synthetic chemistry, and transition metal-catalysed borylation has always been dominant. To avoid toxic reagents and costs associated with metal catalysts, simpler, more economical and effective approaches for delivering organoborons are highly desirable. Here, without the use of any metal catalysts, a CH3CN-involved
A Cobalt-Catalyzed Alkene Hydroboration with Pinacolborane
作者:Lei Zhang、Ziqing Zuo、Xuebing Leng、Zheng Huang
DOI:10.1002/anie.201310096
日期:2014.3.3
efficient cobalt catalyst for the hydroboration of both vinylarenes and aliphatic α‐olefins with pinacolborane is described, providing the anti‐Markovnikov products with excellent regio‐ and chemoselectivity, broad functional‐group tolerance, and high turnover numbers (up to 19 800). The alkenehydroboration route is further extended to a two‐step, one‐pot hydroboration and cross‐coupling of alkylboronates
Silver-Catalyzed <i>anti</i>-Markovnikov Hydroboration of C–C Multiple Bonds
作者:Yan Wang、Rui Guan、Paramasivam Sivaguru、Xuefeng Cong、Xihe Bi
DOI:10.1021/acs.orglett.9b01217
日期:2019.6.7
simple silver salt (AgOAc)-catalyzed anti-Markovnikov-selective hydroboration of alkenes, 1,3-dienes, and alkynes with pinacolborane (HBpin) has been described. This strategy provides an efficient and practical method to access various alkyl-, allyl-, and (E)-alkenylboronate esters in good to excellent yields with regio- and stereoselectivity under ligand- and base-free conditions.
precatalyst combined with 4,4′-di-tert-butyl-2,2′-dipyridyl and aluminum, presenting a rare example of using HBpin as a borane reagent by coupling with alkyl bromides in forming borylated alkanes. Mechanistic studies indicate that aluminum plays important roles in the formation of reactive Cr species and aliphatic radicals, which lead to (alkyl)Cr by reaction with HBpin to give the products.