Cu-promoted intramolecular hydroxylation of CH bonds using directing groups with varying denticity.

Cu-promoted intramolecular hydroxylation of CH bonds using directing groups with varying denticity.
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DOI:
10.1016/j.jinorgbio.2021.111557
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发表时间:
2021-10
影响因子:
3.9
通讯作者:
Garcia-Bosch I
Garcia-Bosch I
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang S;Trammell R;Cordova A;Siegler MA;Garcia-Bosch I

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在这篇研究文章中,我们描述了cu促进sp2和sp3 C-H键的分子内羟基化,使用不同密度的导向基团(双,三和四齿)和天然氧化剂(O2和H2O2)。我们发现双齿导向基团,与Cu和H2O2结合,导致高羟基化收率。另一方面,四齿导向基团不形成羟基化产物。我们的机制研究表明,双齿导向基团允许生成反应性单核铜(II)氢过氧化物中间体,而四齿导向体系形成双核Cu2O2,不氧化C-H键。我们的发现可能揭示了铜依赖的金属酶如颗粒甲烷单加氧酶或裂解多糖单加氧酶氧化强碳氢键的反应机制。
In this research article, we describe the Cu-promoted intramolecular hydroxylation of sp2 and sp3 C-H bonds using directing groups with varying denticity (bi-, tri- and tetradentate) and natural oxidants (O2 and H2O2). We found that bidentate directing groups, in combination with Cu and H2O2, led to high hydroxylation yields. On the other hand, tetradentate directing groups did not form the hydroxylation products. Our mechanistic investigations suggest that bidentate directing groups allow for generating reactive mononuclear copper(II) hydroperoxide intermediates while tetradentate systems form dinuclear Cu2O2 species that do not oxidize C-H bonds. Our findings might shed light on the reaction mechanism(s) by which Cu-dependent metalloenzymes such as particulate methane monooxygenase or lytic polysaccharide monooxygenase oxidize strong C-H bonds.
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