CuII-catalyzed regioselective borylation of alkynes and alkenes
作者:Shiwen Liu、Xiaojun Zeng、Bo Xu
DOI:10.1016/j.tetlet.2016.06.077
日期:2016.8
We developed a regioselective borylation of alkynes and alkenes protocol based on air-stable CuII/multi-dentate ligand system. Our catalytic system gives exclusive β-borylation products for most substrates in excellent chemical yields. We propose that multi-dentate electron poor nitrogen ligands can effectively discourage the formation of α-addition product through the steric hindrance and at same
我们开发了基于空气稳定的Cu II /多齿配体系统的炔烃和烯烃方案的区域选择性硼化。我们的催化系统以优异的化学收率为大多数底物提供独家的β-硼化产物。我们提出,多齿电子贫氮配体可以通过空间位阻有效地阻止α-加成产物的形成,同时保持良好的反应性。
Superparamagnetic copper ferrite nanoparticles catalyzed aerobic, ligand-Free, regioselective hydroboration of alkynes: Influence of synergistic effect
作者:Balaji Mohan、Kang Hyun Park
DOI:10.1016/j.apcata.2016.03.019
日期:2016.6
We discovered a general and comprehensive approach for the regioselective hydroboration of terminal and internalalkynes to synthesize vinylboronates using inexpensive and magnetically separable copper ferrite nanoparticles at low catalyst loading using Bis(pinacolato)diboron in the absence of ligand and additives, under mild and greener conditions. A diverse range of functional groups was tolerated
Copper-catalyzed regioselective hydroboration of terminal alkynes in aqueous medium
作者:Zi-Jian Yao、Shibin Hong、Wei Zhang、Mengyan Liu、Wei Deng
DOI:10.1016/j.tetlet.2016.01.049
日期:2016.2
A mild and environment-friendly copper-catalyzed hydroboration of terminalalkynes in aqueous medium was reported. Regioselectivity control was achieved in the presence of cyclodextrin–bispyridine ligand (CD-1). This protocol was successfully applied to inactivated terminalalkynes. Moreover, the ligand was recovered and reused without any loss of activity over five cycles.
A modular and concise approach to MIDA acylboronates <i>via</i> chemoselective oxidation of unsymmetrical geminal diborylalkanes: unlocking access to a novel class of acylborons
organoboronates. Synthesis of these compounds from readily available substrates under mild conditions and access to novel classes of acylborons has been challenging. We report a novel and concise route to various MIDA acylboronates from terminal alkynes/alkenes or vinyl boronic esters using unsymmetrical geminal diborylalkanes as key intermediates. The high modularity and mild conditions of this strategy allowed
酰基硼酸盐是一类非常有趣且稀有的有机硼酸盐。在温和条件下从容易获得的底物合成这些化合物并获得新型酰基硼一直具有挑战性。我们报告了一种使用不对称偕二硼烷作为关键中间体从末端炔烃/烯烃或乙烯基硼酸酯制备各种 MIDA 酰基硼酸酯的新颖而简洁的途径。该策略的高模块化和温和条件允许轻松获得具有脂肪族、芳香族以及更稀有的杂芳香族、炔基和 α,β-不饱和支架的酰基硼酸盐。据我们所知,这是首个关于双硼化学选择性氧化以及合成 α,β-不饱和酰基硼酸盐的报道。