Regioselective Borylation of the C–H Bonds in Alkylamines and Alkyl Ethers. Observation and Origin of High Reactivity of Primary C–H Bonds Beta to Nitrogen and Oxygen
作者:Qian Li、Carl W. Liskey、John F. Hartwig
DOI:10.1021/ja503676d
日期:2014.6.18
Borylation of aliphatic C-H bonds in alkylamines and alkyl ethers to form primary aminoalkyl and alkoxyalkyl boronate esters and studies on the origin of the regioselectivity of these reactions are reported. The products of these reactions can be used directly in Suzuki-Miyaura cross-coupling reactions or isolated as air-stable potassium trifluoroborate salts. Selective borylation of the terminal C-H
Manganese-Catalyzed Hydroboration of Terminal Olefins and Metal-Dependent Selectivity in Internal Olefin Isomerization–Hydroboration
作者:Subhash Garhwal、Asja A. Kroeger、Ranjeesh Thenarukandiyil、Natalia Fridman、Amir Karton、Graham de Ruiter
DOI:10.1021/acs.inorgchem.0c03451
日期:2021.1.4
In the past decade, the use of earth-abundant metals in homogeneous catalysis has flourished. In particular, metals such as cobalt and iron have been used extensively in reductive transformations including hydrogenation, hydroboration, and hydrosilylation. Manganese, on the other hand, has been considerably less explored in these reductive transformations. Here, we report a well-defined manganese complex
Addition of a B–H Bond across an Amido–Cobalt Bond: Co<sup>II</sup>–H-Catalyzed Hydroboration of Olefins
作者:Maofu Pang、Chengjuan Wu、Xuewen Zhuang、Fanjun Zhang、Mincong Su、Qingxiao Tong、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/acs.organomet.8b00114
日期:2018.5.14
pinacolborane (HBpin) for catalytic terminal hydroboration of olefins. The cooperative cobalt(II)–amido reactivity in 1 enables the B–H bondcleavage, affording the 17-electron cobalt(II) hydride Cp*Co(1,2-Ph2PC6H4NH(Bpin)), abbreviated H1(Bpin), in which the borenium ion is captured by the uncoordinated nitrogen atom of the phosphinoaminato ligand. Hydroboration of the C═C bond can be promoted by a heteroatom
本文描述了一种定义明确的钴(II)半三明治复合物,其带有膦酰氨基配体Cp * Co(1,2-Ph 2 PC 6 H 4 NH)(1),可以活化频哪硼烷(HBpin)作为催化末端烯烃的硼氢化。钴(II)-酰胺基的协同反应1使B-H键断裂,从而得到17电子氢化钴(Cp * Co(1,2-Ph 2 PC 6 H 4 N H(Bpin)),缩写H 1(Bpin),其中硼氮被膦酰氨基配体的未配位氮原子捕获。C═C键的氢硼化可由末端烯烃的β位上的杂原子如N或O促进。这种氢化硼化的机理是通过基于氢化钴(II)的各种化学计量反应确定的。借助Co II – N对B–H键断裂的协同反应,我们的催化依赖于系统自身生成的Co II– H氢化物。
A Cobalt-Catalyzed Alkene Hydroboration with Pinacolborane
作者:Lei Zhang、Ziqing Zuo、Xuebing Leng、Zheng Huang
DOI:10.1002/anie.201310096
日期:2014.3.3
efficient cobalt catalyst for the hydroboration of both vinylarenes and aliphatic α‐olefins with pinacolborane is described, providing the anti‐Markovnikov products with excellent regio‐ and chemoselectivity, broad functional‐group tolerance, and high turnover numbers (up to 19 800). The alkenehydroboration route is further extended to a two‐step, one‐pot hydroboration and cross‐coupling of alkylboronates
Synthesis of 2-substituted hydroquinone derivatives from 1,4-benzoquinone and allyl ethers
作者:Kevin J. Kaurich、Paul A. Deck
DOI:10.1016/j.tet.2018.01.048
日期:2018.5
B-Alkylpinacolboranes, derived from rhodium-catalyzed hydroboration of allyl ethers with pinacolborane, react with 1,4-benzoquinone under acidic, oxidizing conditions, to afford, after subsequent hydrogenation, 2-substituted hydroquinones in isolated, purified yields of about 50% based on 1,4-benzoquinone. The product hydroquinones have potential use as precursors to poly(arylene ether) and related