LiTMP Trans-Metal-Trapping of Fluorinated Aromatic Molecules: A Comparative Study of Aluminum and Gallium Carbanion Traps.

LiTMP Trans-Metal-Trapping of Fluorinated Aromatic Molecules: A Comparative Study of Aluminum and Gallium Carbanion Traps.
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LITMP氟化芳香族分子的跨金属陷阱:铝和甘油carbanion陷阱的比较研究。

DOI:
10.1002/anie.201706064
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发表时间:
2017-08-01
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Mulvey RE
Mulvey RE
中科院分区:
其他
文献类型:
--
作者:
McLellan R;Uzelac M;Kennedy AR;Hevia E;Mulvey RE

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由于锂化中间体的稳定性较低,氟芳香族支架对锂化提出了挑战。在这里,我们将跨金属捕集(TMT)应用于一系列关键的氟化芳烃。在 TMT 中,LiTMP 进行金属化,而有机金属陷阱则拦截出现的碳负离子。本研究对比了 iBu2AlTMP 和 Ga(CH2SiMe3)3 的捕获能力,绘制了它们的 TMT 反应结构图,并通过 NMR 研究探测了金属化氟代芳香族中间体的相对稳定性。结果表明,与 Ga−C(芳基)物质相比,安装的 Al−C(芳基)键更容易因苯炔形成和 Li-F 释放而分解。因此,后者对于后续反应活性更好,如与苯甲酰氯产生酮的交叉偶联反应所证明的那样。
Fluoroaromatic scaffolds pose a challenge to lithiation due to low stability of lithiated intermediates. Here we apply trans‐metal‐trapping (TMT) to a series of key fluorinated aromatics. In TMT, LiTMP performs the metalation, while an organometallic trap intercepts the emergent carbanion. This study contrasts the trapping abilities of iBu2AlTMP and Ga(CH2SiMe3)3, structurally mapping their TMT reactions and probing relative stabilities of metalated fluoroaromatic intermediates by NMR studies. Results show the installed Al−C(aryl) bonds are more prone to decomposition by benzyne formation and Li‐F liberation, than the Ga−C(aryl) species. The latter are thus better for onward reactivity as demonstrated in cross‐coupling reactions with benzoyl chloride that produce ketones.
DOI: 10.1021/jo802713y
发表时间: 2009-03-06
期刊: The Journal of organic chemistry
影响因子: --
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