Aromatic Cyanoalkylation through Double C-H Activation Mediated by Ni(III).

Aromatic Cyanoalkylation through Double C-H Activation Mediated by Ni(III).
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通过 Ni(III) 介导的双 C-H 活化进行芳香氰烷基化。

DOI:
10.1021/jacs.6b02405
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发表时间:
2016
影响因子:
15
通讯作者:
Liviu M. Mirica
Liviu M. Mirica
中科院分区:
化学1区
文献类型:
--
作者:
Wen;Shuai Zheng;Jason W. Schultz;N. Rath;Liviu M. Mirica

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在这里,我们报道了一个原子和步骤经济的芳香族氰烷基化反应,它以腈为基团,通过Ni(III)介导的CSP(2)-H和CSP(3)-H键活化步骤进行。除了与乙腈的氰甲基化反应外,还观察到了区域选择性的α-氰基烷基化反应,生成仲腈和叔腈。重要的是,据我们所知,这些是发生在Ni(III)中心的C-H键活化反应的第一个例子,它可能表现出不同于对应于类似的Ni(II)中心的反应活性和选择性分布。这些研究为设计涉及高价镍物种的催化C-H活化和官能化反应提供了指导原则。
Herein we report an atom- and step-economic aromatic cyanoalkylation reaction that employs nitriles as building blocks and proceeds through Csp(2)-H and Csp(3)-H bond activation steps mediated by Ni(III). In addition to cyanomethylation with MeCN, regioselective α-cyanoalkylation was observed with various nitrile substrates to generate secondary and tertiary nitriles. Importantly, to the best of our knowledge these are the first examples of C-H bond activation reactions occurring at a Ni(III) center, which may exhibit different reactivity and selectivity profiles than those corresponding to analogous Ni(II) centers. These studies provide guiding principles to design catalytic C-H activation and functionalization reactions involving high-valent Ni species.
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