有机化学 ›› 2026, Vol. 46 ›› Issue (1): 146-155.DOI: 10.6023/cjoc202507022 上一篇    下一篇

研究论文

三酮烯烃与硝酮的反常区域选择性[3+2]环加成反应研究

韩天娇b, 师迁迁a,*(), 符运栋a,*(), 梅光建b,*()   

  1. a 河南师范大学 抗病毒性传染病创新药物全国重点实验室 平原实验室 河南新乡 453007
    b 郑州大学化学学院 平原实验室 郑州 450001
  • 收稿日期:2025-07-15 修回日期:2025-08-26 发布日期:2025-09-17
  • 通讯作者: 师迁迁, 符运栋, 梅光建
  • 基金资助:
    国家自然科学基金(22371265); 国家自然科学基金(22403027); 河南省自然科学基金(232301420047); 河南省自然科学基金(222300420084)

Regio-reversed [3+2] Cycloaddition of Triketone Enones with Nitrones

Han Tianjiaob, Shi Qianqiana,*(), Fu Yundonga,*(), Mei Guangjianb,*()   

  1. a State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Henan Normal University, Xinxiang, Henan 453007
    b College of Chemistry and Pingyuan Laboratory, Zhengzhou University, Zhengzhou 450001
  • Received:2025-07-15 Revised:2025-08-26 Published:2025-09-17
  • Contact: Shi Qianqian, Fu Yundong, Mei Guangjian
  • Supported by:
    National Natural Science Foundation of China(22371265); National Natural Science Foundation of China(22403027); Natural Science Foundation of Henan Province(232301420047); Natural Science Foundation of Henan Province(222300420084)

三酮烯烃是一种高度缺电子的不饱和羰基化合物, 也是一种重要的合成砌块. 在之前的研究中, 由于电子效应和空间效应, 三酮烯烃通常发生β-选择性的共轭加成或环加成反应. 实现三酮烯烃的反常区域选择性共轭加成或环加成反应具有挑战性. 在前期的工作基础上, 实现了三酮烯烃与硝酮反常区域选择性[3+2]环加成反应, 在无催化剂的条件下, 高效、高立体选择性地合成出一系列异噁唑烷类化合物, 收率最高达到95%, 非对映选择性达到20∶1. 该方法具有绿色环保、操作简便和底物适用范围广的优点, 为异噁唑烷类化合物的合成提供了参考. 密度泛函理论(DFT)计算显示, 这种反常的区域选择性环加成反应在能量上是有利的.

关键词: 三酮烯烃, 硝酮, 反常区域选择性, 环加成

Triketone alkenes represent a class of highly electron-deficient unsaturated carbonyl compounds and serve as important and versatile synthetic building blocks. In previous work, triketone enones usually undergo β-selective conjugate addition or cycloaddition. It is challenging to achieve regio-reversed conjugate addition or cycloaddition of triketone enones. Based on previous work, regio-reversed [3+2] cycloaddition of triketone enones with nitrones was achieved, and a series of isoxazolidines were synthesized effectively and stereoselectively under catalyst-free conditions, with up to 95% yield and 20∶1 dr. It exhibits green properties, easy operation and a wide substrate range, offering a reference for isoxazolidine synthesis. Density functional theory (DFT) study reveals that this regio-reversed [3+2] cycloaddition is energetically favorable.

Key words: triketone enone, nitrone, reversed regioselectivity, cycloaddition