Copper(<scp>ii</scp>)-catalyzed protoboration of allenes in aqueous media and open air
作者:Russell F. Snead、Jan Nekvinda、Webster L. Santos
DOI:10.1039/d0nj02010a
日期:——
A method has been developed for the facile Cu(II)-catalyzed protoboration of monosubstituted allenes in aqueous media under atmospheric conditions. The reaction occurs site selectively, favoring internal alkene protoboration to afford 1,1-disubstituted vinylboronic acid derivatives (up to 93 : 7) with modest to good yields. The method has been applied to a variety of phenylallene derivatives as well
CuCl–K2CO3-catalyzed highly selective borylcupration of internal alkynes – ligand effect
作者:Weiming Yuan、Shengming Ma
DOI:10.1039/c2ob26147b
日期:——
An efficient and practical copper-catalyzed highly regio- and stereoselective borylcupration of internal alkynes with bis(pinacolato)diboron using a catalytic amount of K2CO3 as base producing Z-alkenylboron compounds has been demonstrated by applying the ligand effect: commercially available electron-rich tris(p-methoxyphenyl) phosphine ensures a smooth and efficient reaction. Functionalized alkynes
高效而实用的铜催化内部炔烃的高度区域和立体选择性的硼烷基富集 bis(pinacolato)diboron通过应用配体效应已证明使用催化量的K 2 CO 3作为碱生产Z-烯基硼化合物三(对甲氧基苯基)膦确保反应平稳有效。也可以以优异的选择性使用官能化的炔烃,例如炔丙醇和衍生物以及N-炔丙基甲苯磺酰胺。
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。
Highly regio- and stereoselective synthesis of alkenylboronic esters by copper-catalyzed boron additions to disubstituted alkynes
作者:Hye Ryung Kim、Jaesook Yun
DOI:10.1039/c0cc04496b
日期:——
The copper-catalyzedaddition of bis(pinacolato)diboron to internal alkynes in the presence of methanol generates alkenylboron compounds with high levels of regio- and stereoselectivities. The catalytic efficiency is increased by using monodentate phosphine ligands, especially P(p-tolyl)(3) and a range of internal alkynes was borylated in good yields.
Stereoselective Synthesis of Trisubstituted Alkenes by Nickel‐Catalyzed Benzylation and Alkene Isomerization
作者:Yunlong Zhao、Chen‐Fei Liu、Leroy Qi Hao Lin、Albert S. C. Chan、Ming Joo Koh
DOI:10.1002/anie.202202674
日期:2022.6.27
An NHC−NiI catalyst promotes regio- and stereoselective coupling of polarized terminal olefins with benzyl chlorides to afford trisubstituted borylalkenes and styrenes. The reaction proceeds through branched-selective Heck-type benzylation followed by trans-selective allyl isomerization.