Copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids under ligand-free or both ligand- and base-free conditions
作者:Ying-Wei Zhao、Qiang Feng、Qiu-Ling Song
DOI:10.1016/j.cclet.2016.02.012
日期:2016.4
An efficient copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids with bis(pinacolato)diboron was developed, affording β-vinylboronates as the only products in high yields. Extra hydrogen sources such as methanol are not needed in this catalytic system. This reaction could be performed successfully under ligand- and base-free conditions. It demonstrated that phenylpropiolic acids can
Lithium compounds as single site catalysts for hydroboration of alkenes and alkynes
作者:Milan Kumar Bisai、Sandeep Yadav、Tamal Das、Kumar Vanka、Sakya S. Sen
DOI:10.1039/c9cc05783h
日期:——
The hydroboration of alkenes and alkynes using easily accessible lithium compounds [2,6-di-tert-butyl phenolatelithium (1a) and 1,1′ dilithioferrocene (1b)] has been achieved with good yields, high functional group tolerance and excellent chemoselectivity. Deuterium-labeling experiments confirm the cis-addition of pinacolborane. The methodology has been further extended to myrcene, which undergoes
Zirconium-based porphyrinic MOFs (PMOFs, MOF = metal-organicframework) have gained considerable attention in the field of electric/thermo/photo-catalysis as heterogeneous single-site catalysts; however, the study on multisite synergistic catalysis of PMOFs are rare. Herein, we have successfully developed a highly regio- and stereo-selective synthetic method of (E)-β-vinylboronates through hydroboration
锆基卟啉MOFs(PMOFs,MOF=金属有机骨架)作为非均相单中心催化剂在电/热/光催化领域获得了广泛关注;然而,关于PMOFs多位点协同催化的研究很少。在此,我们成功开发了一种高度区域选择性和立体选择性的 ( E )- β合成方法-乙烯基硼酸酯通过使用 PCN-222(Cu,PCN = 多孔配位网络)作为多功能非均相催化剂对炔烃进行硼氢化。与均相催化体系相比,该方法获得了较高的 TOF 值,这源于中心 Cu(II) 离子、卟啉环的 N 原子和 Zr 节点上的末端 -OH 基团的协同作用。值得注意的是,密度泛函理论 (DFT) 研究表明,五元“Cu-NBCC”环是负责具有特定选择性的硼氢化过程的关键物质。
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‐Acceptorless Dehydrogenative Boration and Transfer Boration of Alkenes Enabled by Zirconium Catalyst
作者:Xiaonan Shi、Sida Li、Lipeng Wu
DOI:10.1002/anie.201908931
日期:2019.11.4
catalyst. Our methodology avoids using precious transitionmetals, additional hydrogen acceptors, high temperatures, and long reaction times, which were required to overcome the reducing ability of borane, to give alkyl boronate esters. Detailed mechanistic studies revealed a reversible reaction pathway and further suggested applying the zirconium complex as a "shuttle catalyst" for transfer boration
A magnesium‐catalyzed hydroboration of alkynes providing good yields and selectivities for a wide range of terminal and symmetrical and unsymmetrical internal alkynes has been developed. The compatibility with many functional groups makes this magnesium catalyzed procedure attractive for late stage functionalization. Experimental mechanistic investigations and DFT calculations reveal insights into