Vanadium-Catalyzed Stereo- and Regioselective Hydroboration of Alkynes to Vinyl Boronates

Vanadium-Catalyzed Stereo- and Regioselective Hydroboration of Alkynes to Vinyl Boronates
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钒催化炔烃立体和区域选择性硼氢化反应生成乙烯基硼酸酯

DOI:
10.1021/acscatal.2c01318
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发表时间:
2022
期刊:
影响因子:
12.9
通讯作者:
Dub, Pavel A.
Dub, Pavel A.
中科院分区:
化学1区
文献类型:
--
作者:
Zhang, Guoqi;Zeng, Haisu;Zheng, Shengping;Neary, Michelle C.;Dub, Pavel A.

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钒催化的分子配合物-选择性反马尔可夫尼科夫硼氢化炔烃生成硼酸乙烯酯,室温下可达4000个翻转数。这是在炔烃均相催化硼化反应中使用钒的第一个例子。该方法对多种官能团(包括C = C双键)具有耐受性。因此,1-己烯-5-炔可以在三键处定量和选择性地还原,而不影响双键。催化循环的初步计算分析揭示了两态反应性和以前未知的与氧化还原活性配体相关的复杂性。具体来说,研究发现配体可以在金属之间来回穿梭两个电子,从而在催化反应配位上适应三种不同的氧化态。
Molecular complexes of vanadium catalyzecis-selectiveanti-Markovnikov hydroboration of alkynes to generate vinyl boronate esters with appreciable turnover numbers of up to 4000 at room temperature. This represents the first example of the use of vanadium in homogeneous catalytic hydroboration of alkynes. The method is tolerant to various functional groups, including C═C double bonds. Accordingly, 1-hexen-5-yne can be quantitatively and selectively reduced at the triple bond, leaving the double bond unaffected. Preliminary computational analysis of the catalytic cycle reveals both two-state reactivity and previously unknown complexity associated with the redox-active ligand. Specifically, it was found that the ligand can shuttle up to two electrons back-and-forth to and from the metal, which thus adapts three different oxidation states on the catalytic reaction coordinate.
DOI: 10.1021/jacs.6b09759
发表时间: 2016-11-09
影响因子: 15
作者:
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DOI: 10.1002/anie.201007876
发表时间: 2011-01-01
影响因子: 16.6
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期刊: ORGANIC LETTERS
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