Enhanced Reactivity by Torsional Strain of Cyclic Diaryliodonium in Cu-Catalyzed Enantioselective Ring-Opening Reaction

Enhanced Reactivity by Torsional Strain of Cyclic Diaryliodonium in Cu-Catalyzed Enantioselective Ring-Opening Reaction
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铜催化对映选择性开环反应中环状二芳基碘的扭转应变增强反应活性

DOI:
10.1016/j.chempr.2018.01.017
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发表时间:
2018-03
期刊:
影响因子:
23.5
通讯作者:
Zhenhua Gu
Zhenhua Gu
中科院分区:
化学1区
文献类型:
--
作者:
Kun Zhao;Longhui Duan;Shibo Xu;Julong Jiang;Yao Fu;Zhenhua Gu

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反旋异构体是由围绕单键的受限旋转产生的立体异构体。特别是,联芳基反旋体是一类重要的化合物,因为它们广泛存在于天然产物、配体和药物分子中。然而,在温和的条件下制备结构多样的联芳基反二聚体是一个重大的挑战。本文描述了cu -双(恶唑啉基)吡啶催化的环二芳基碘鎓的不对称开环胺化反应。增加这些环类化合物的扭转应变可显著提高环二芳基碘鎓的反应性。计算结果表明,环二芳基碘鎓的两种构象具有较低的旋转势垒,反应收率高,对映体选择性高(可达100 ~ 99% ee)。此外,与传统的二芳基碘化反应相比,该开环胺化反应具有较高的原子经济性。最后,我们提出了一个催化循环和一个机制模型来解释观察到的对映体选择性。
Atropisomers are stereoisomers arising from the restricted rotation around a single bond. In particular, biaryl atropisomers represent an important class of compounds, as they are widely present in natural products, ligands and pharmaceutical molecules. However, the preparation of structurally diverse biaryl atropisomers under mild conditions is a significant challenge. Here, we describe a Cu-bis(oxazolinyl)pyridine-catalyzed asymmetric ring-opening amination reaction of cyclic diaryliodoniums. Increasing the torsional strain of these cyclic compounds significantly improved the reactivity of cyclic diaryliodoniums. Computational investigation indicated that the two conformers of the cyclic diaryliodoniums had a low rotational barrier, and generally the reaction achieved high yields and high enantioselectivity (up to >99% ee). Furthermore, this ring-opening amination reaction also featured high atom economy in comparison with traditional reactions involving diaryliodonium. Finally, we propose a catalytic cycle and a mechanistic model that accounts for the observed enantioselectivity.
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