Copper-NHC-Mediated Semihydrogenation and Hydroboration of Alkynes: Enhanced Catalytic Activity Using Ring-Expanded Carbenes
作者:Jonathan W. Hall、Darcy M. L. Unson、Paul Brunel、Lee R. Collins、Mateusz K. Cybulski、Mary F. Mahon、Michael K. Whittlesey
DOI:10.1021/acs.organomet.8b00467
日期:2018.9.24
tert-butoxide complexes bearing five-, six-, and seven-membered ring N-heterocycliccarbenes, prepared by protonolysis of (NHC)CuMes with tBuOH, have been used as catalytic precursors in the semihydrogenation of alkynes with silanes/tBuOH and the hydroboration of alkynes with HBPin. Both processes proceed with high regioselectivity and show enhancements with six- and seven-membered ring carbenes.
由(NHC)CuMes与t BuOH质子分解制得的一系列带有五元,六元和七元环N-杂环卡宾的二配位叔丁醇铜配合物已被用作苯甲酸半加氢反应的催化前体。炔烃与硅烷/ t BuOH的混合,以及炔烃与HBPin的硼氢化。两种方法都具有较高的区域选择性,并显示六元和七元环卡宾具有增强作用。
Copper-Catalyzed Highly Regio- and Stereoselective Directed Hydroboration of Unsymmetrical Internal Alkynes: Controlling Regioselectivity by Choice of Catalytic Species
Taking control of boron: A highly regio‐ and stereoselective copper‐catalyzedhydroboration of unsymmetrical internal alkynes has been developed. The regioselectivity was successfully controlled by the choice of catalytic species (copper hydride or boryl copper; see scheme).
The carboboration of Me<sub>3</sub>Si-substituted alkynes and allenes with boranes and borocations
作者:James R. Lawson、Valerio Fasano、Jessica Cid、Inigo Vitorica-Yrezabal、Michael J. Ingleson
DOI:10.1039/c5dt03003j
日期:——
ArylBCl2and aryl and vinyl containing borocations synthesised by electrophilic borylation effect the carboboration of TMS-substituted alkynes and allenes.
Copper-Catalyzed Double Borylation of Silylacetylenes: Highly Regio- and Stereoselective Synthesis of <i>Syn</i>-Vicinal Diboronates
作者:Ho-Young Jung、Jaesook Yun
DOI:10.1021/ol300909k
日期:2012.5.18
Phosphite–copper(I) complexes efficiently catalyzed the double borylation of internal silylated alkynes to provide vicinal diboronates with excellent regio- and stereoselectivity. The copper-catalyzed reaction between bis(pinacolato)diboron (B2pin2) and aryl-substituted silylacetylenes in the presence of MeOH resulted in double syn addition of the pinacolboronate moiety (Bpin) and H across the triple