Cobalt-Catalyzed Hydroboration of Terminal and Internal Alkynes
作者:María J. González、Felix Bauer、Bernhard Breit
DOI:10.1021/acs.orglett.1c02854
日期:2021.11.5
A novel methodology to access synthetically versatile vinylboronic esters through a ligand-controlled cobalt-catalyzed hydroboration of terminal and internalalkynes is reported. The approach relies on the in situ reduction of Co(II) by H-BPin in the presence of bisphosphine ligands generating catalytically active Co(I) hydride complexes. This procedure avoids the use of stoichiometric amounts of base
Spiro(phosphoamidite) ligand (SIPHOS)/Cu(OTf) 2 -catalyzed highly regio- and stereo-selective hydroborations of internal alkynes with diborane in water
作者:Qing-Qing Xuan、Ya-Hui Wei、Qiu-Ling Song
DOI:10.1016/j.cclet.2017.04.031
日期:2017.6
Abstract The highly regio- and stereoselective hydroborations of unactivated internal alkynes with diboron compoundcatalyzed by Cu(OTf) 2 with spiro(phosphoamidite) as ligand in the presence of Cs 2 CO 3 in water was developed. This protocol was applied efficiently in the aqueous synthesis of multi-substituted vinylboranes.
摘要研究了在水中Cs 2 CO 3存在下,Cu(OTf)2与螺(磷酰胺)为配体催化的二硼化合物催化的未活化内炔烃的高度区域选择性和立体选择性硼氢化反应。该方案有效地应用于多取代乙烯基硼烷的水合成中。