Selective ortho-C-H Activation in Arenes without Functional Groups.

Selective ortho-C-H Activation in Arenes without Functional Groups.
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DOI:
10.1021/jacs.2c04621
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发表时间:
2022-07-06
影响因子:
15
通讯作者:
Sergeev, Alexey G.
Sergeev, Alexey G.
中科院分区:
化学1区
文献类型:
--
作者:
Chan, Antony P. Y.;Jakoobi, Martin;Wang, Chenxu;O'Neill, Robert T.;Aydin, Gulsevim S. S.;Halcovitch, Nathan;Boulatov, Roman;Sergeev, Alexey G.

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烷基芳烃中的芳香C-H活化是由简单烃前驱体合成功能化有机分子的关键步骤。这种C-H活化的已知实例通常产生由最小受阻C-H键的活化产生的产物的混合物。在这里,我们报告了通过简单的铱配合物在烷基芳烃中高度选择性的邻位C-H活化。我们证明,烷基取代基的能力,以克服金属介导的C-H活化的最少受阻的芳香族C-H键的典型偏好的结果从瞬时插入铱到苄基C-H键。这使得铱能够快速插入邻位-C-H键,然后通过还原消除再生苄基C-H键。较大的烷基取代基增加邻位选择性。所描述的化学反应代表了现有芳族C-H键活化方法的概念上的新替代方案。
Aromatic C–H activation in alkylarenes is a key step for the synthesis of functionalized organic molecules from simple hydrocarbon precursors. Known examples of such C–H activations often yield mixtures of products resulting from activation of the least hindered C–H bonds. Here we report highly selective ortho-C–H activation in alkylarenes by simple iridium complexes. We demonstrate that the capacity of the alkyl substituent to override the typical preference of metal-mediated C–H activation for the least hindered aromatic C–H bonds results from transient insertion of iridium into the benzylic C–H bond. This enables fast iridium insertion into the ortho-C–H bond, followed by regeneration of the benzylic C–H bond by reductive elimination. Bulkier alkyl substituents increase the ortho selectivity. The described chemistry represents a conceptually new alternative to existing approaches for aromatic C–H bond activation.
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发表时间: 2012-06-27
期刊: NATURE
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