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。
Bis(imidazoline-2-thione)–copper(i) catalyzed regioselective boron addition to internal alkynes
作者:Hye Ryung Kim、Il Gu Jung、Kihyun Yoo、Kwonho Jang、Eun Sun Lee、Jaesook Yun、Seung Uk Son
DOI:10.1039/b919515g
日期:——
New catalytic systems based on a bis(1,3-disubstituted imidazoline 2-thione)âcopper complex have been developed for the highly regioselective boration of internal alkynes.
A highly selective hydroboration of unsymmetrical internalalkynes featuring unique regioselectivity, broad substrate scope and good functional group compatibility was realized by using cobalt catalysts modified with newly developed cyclopropane-based diphosphine ligands. The current protocol enabled the synthesis of novel alkenyl borates and improved the synthetic efficiency of bioactive compounds
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.