Thiazol-2-ylidenes as N-Heterocyclic carbene ligands with enhanced electrophilicity for transition metal catalysis.

Thiazol-2-ylidenes as N-Heterocyclic carbene ligands with enhanced electrophilicity for transition metal catalysis.
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噻唑 - 2 - 亚基作为具有增强亲电性的N - 杂环卡宾配体用于过渡金属催化。

DOI:
10.1038/s42004-022-00675-7
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发表时间:
2022-05-06
影响因子:
5.9
通讯作者:
Szostak, Michal
Szostak, Michal
中科院分区:
化学2区
文献类型:
--
作者:
Zhang, Jin;Li, Tao;Li, Xiangyang;Lv, Anqi;Li, Xue;Wang, Zheng;Wang, Ruihong;Ma, Yangmin;Fang, Ran;Szostak, Roman;Szostak, Michal

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在过去的20年里,N-杂环卡宾(NHC)已成为过渡金属催化配体开发的主导方向。特别是,强的 σ 供体与可调节的空间环境相结合,使 NHC 成为用于 C-C 和 C-杂原子键形成的最常见配体之一。在此,我们报道了噻唑-2-亚基的空间和电子性质的研究。我们证明,噻唑杂环和增强的π-亲电性产生了一类高活性卡宾配体,用于亲电环化反应,形成有价值的恶唑啉杂环。介绍了空间、给电子和 π 接受特性以及结构表征和配位化学的评估。这种催化模式可应用于后期药物功能化,为药物化学提供有吸引力的构建模块。考虑到 N-杂环配体的关键作用,我们预计 N-芳基噻唑-2-亚基作为现代化学合成中的配体将引起广泛的兴趣。 N-杂环卡宾被广泛用作过渡金属催化中的配体,但主要限于N-芳基咪唑基。在这里,作者报告了 thiazol-2-ylidenes 的空间和电子性质,证明它们增强的 π 亲电性使它们在过渡金属催化的亲电环化反应中作为卡宾配体具有吸引力。
Over the last 20 years, N-heterocyclic carbenes (NHCs) have emerged as a dominant direction in ligand development in transition metal catalysis. In particular, strong σ-donation in combination with tunable steric environment make NHCs to be among the most common ligands used for C–C and C–heteroatom bond formation. Herein, we report the study on steric and electronic properties of thiazol-2-ylidenes. We demonstrate that the thiazole heterocycle and enhanced π-electrophilicity result in a class of highly active carbene ligands for electrophilic cyclization reactions to form valuable oxazoline heterocycles. The evaluation of steric, electron-donating and π-accepting properties as well as structural characterization and coordination chemistry is presented. This mode of catalysis can be applied to late-stage drug functionalization to furnish attractive building blocks for medicinal chemistry. Considering the key role of N-heterocyclic ligands, we anticipate that N-aryl thiazol-2-ylidenes will be of broad interest as ligands in modern chemical synthesis. N-heterocyclic carbenes are widely exploited as ligands in transition metal catalysis, but are largely limited to N-arylimidazolylidenes. Here, the authors report on the steric and electronic properties of thiazol-2-ylidenes, demonstrating that their enhanced π-electrophilicity makes them attractive as carbene ligands in transition metal-catalysed electrophilic cyclization reactions.
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