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研究论文

三线态能量转移促进的自由基链式烯烃氢芳基化反应研究

郭仕勋a, 王卫*,b, 张永强*,a   

  1. a华东理工大学药学院 上海市 200237;
    b亚利桑那大学药理学和毒理学系 美国图森市 AZ 85721-0207
  • 收稿日期:2024-07-30 修回日期:2024-10-05
  • 基金资助:
    国家自然科学基金(No. 22171080)和上海市自然科学基金(No. 23ZR1417200)资助项目.

Research of Triplet Energy Transfer Enabled Radical-Chain Hydroarylation of Alkenes

Shixun Guoa, Wei Wang*,b, Yongqiang Zhang*,a   

  1. aSchool of Pharmacy, East China University of Science and Technology, Shanghai City, 200237;
    bDepartment of Pharmacology and Toxicology, University of Arizona, Tucson, AZ 85721-0207, USA
  • Received:2024-07-30 Revised:2024-10-05
  • Contact: * E-mail: yongqiangzhang@ecust.edu.cn; wwang@pharmacy.arizona.edu
  • Supported by:
    National Natural Science Foundation of China (No. 22171080) and Natural Science Foundation of Shanghai (No. 23ZR1417200).

以碘代芳烃为芳基供体,本研究报道了一例三线态能量转移促进的自由基链式烯烃氢芳基化反应。该反应条件绿色温和, 表现出较高的反应效率,良好的官能团兼容性、底物适用性,优异的反马氏加成区域选择性,且可有效放大至克级规模。炔烃或复杂烯烃底物可有效参与。原位生成的硅自由基通过卤原子转移促进芳基自由基生成是反应得以发生的关键。通过底物设计,该反应亦可应用于四氢喹啉酮药效骨架的合成。当反应在分子内发生时, 也可使用相对惰性的溴代芳烃为芳基供体。同时,我们还初步探索了黄原酸苯酯做为芳基供体进行反应的可行性。

关键词: 三线态能量转移, 卤原子转移, 烯烃氢芳基化, 自由基链式反应, 反马氏加成

A radical chain hydroarylation of alkenes enabled by triplet energy transfer using aryl iodides as aryl donor reagents was reported. The reaction is mild and green, displays high reaction efficiency, good functional group compatibility and substrate applicability, excellent anti-markovnikov selectivity and could be easily scaled-up to gram scales. Alkynes and complex alkenes were amendable. The halogen-atom transfer (XAT) promoted by in-situ generated silyl radical is crucial for the transformation. The application of the reaction in the synthesis of pharmceutiacally-relavant tetrahydroquinoline scaffold has been also demonstrated via rational design of the substrate. When the reaction occurs intramolecularly, relatively inert aryl bromide could serve as aryl donor. Meanwhile, we also preliminarily probed the feasibility of phenyl xanthate as alternative aryl donor reagent.

Key words: triplet energy transfer, halogen-atom transfer, hydroarylation of alkenes, radical chain reaction, anti-markovnikov addition