Chinese Journal of Organic Chemistry ›› 2022, Vol. 42 ›› Issue (12): 4300-4314.DOI: 10.6023/cjoc202209028 Previous Articles     Next Articles

Special Issue: 自由基化学专辑

ARTICLES

吡唑化提高喹喔啉酮敏化效率: 氮杂环丁烷的合成及进一步开环反应

赵成军, 白治琴, 何建, 刘强*()   

  1. 兰州大学化学化工学院 功能有机高分子化学国家重点实验室 兰州 730000
  • 收稿日期:2022-09-21 修回日期:2022-10-21 发布日期:2022-11-21
  • 通讯作者: 刘强
  • 作者简介:
    共同第一作者
  • 基金资助:
    国家自然科学基金(21871123)

Improving the Efficiency of Sensitized Quinoxlin-2(1H)-ones via Pyrazolylation: Synthesis of Azetidines and Further Ring-Opening Reaction

Chengjun Zhao, Zhiqin Bai, Jian He, Qiang Liu()   

  1. State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000
  • Received:2022-09-21 Revised:2022-10-21 Published:2022-11-21
  • Contact: Qiang Liu
  • About author:
    These authors contributed equally to this work.
  • Supported by:
    National Natural Science Foundation of China(21871123)

A mild approach to prepare functionalized azetidines by intermolecular aza Paternò-Büchi reaction using suitable auxochrome (pyrazole) to promote 3-pyrazolyl quinoxalin-2(1H)-ones into its excited state has been developed. Overall, pyrazolyl plays a key role in reducing the excited state energy of the triplet state of quinoxalinones, changing the redox potential and subsequent transformation as a good leaving group. The cross-dehydrogenative coupling (CDC)-amination, aza Paternò-Büchi reaction, and elimination reaction were also investigated.

Key words: visible light catalysis, aerobic oxidation, photocycloaddition, Paternò-Buchi reaction, energy transfer