有机化学 ›› 2025, Vol. 45 ›› Issue (5): 1770-1777.DOI: 10.6023/cjoc202403008 上一篇    下一篇

研究论文

可见光条件下N-苄基苯并三氮唑自由基脱氮气开环合成6-取代菲啶

李慧a, 阿布力米提•阿布都卡德尔a,*(), 周磊a,b,*()   

  1. a 新疆大学化学学院 省部共建碳基能源资源化学与利用国家重点实验室 乌鲁木齐 830046
    b 中山大学化学学院 绿色化学与分子工程研究院 广州 510275
  • 收稿日期:2024-03-05 修回日期:2024-03-20 发布日期:2024-04-24
  • 基金资助:
    国家自然科学基金(22271318); 国家自然科学基金(22061040)

Radical Denitrogenative Ring Opening of N-Benzyl-benzotriazoles for the Synthesis of 6-Substituted Phenanthridines under Visible Light Conditions

Hui Lia, Ablimit Abdukadera,*(), Lei Zhoua,b,*()   

  1. a State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046
    b Institute of Green Chemistry and Molecular Engineering, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275
  • Received:2024-03-05 Revised:2024-03-20 Published:2024-04-24
  • Contact: * E-mail: ablimit1970@126.com; zhoul39@mail.sysu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(22271318); National Natural Science Foundation of China(22061040)

菲啶是许多天然生物碱和具有生物活性化合物的核心骨架. 以有机荧光素4CzIPN为可见光催化剂, 在温和条件下实现了N-苄基苯并三氮唑的自由基脱氮气开环. 生成的含亚胺结构的芳基自由基进而与芳环发生分子内环化, 高效地构建了一系列6-取代菲啶. 反应使用体积分数为10%的氧气为氧化剂, 抑制了经由苯并三氮唑离去的二芳基酮副产物的生成.

关键词: 苯并三氮唑, 脱氮气, 芳基自由基, 菲啶, 可见光氧化还原催化

Phenanthridines are the essential core structural units in a variety of natural alkaloids and biologically active compounds. With organic fluorescein 4CzIPN as the visible light photocatalyst, radical denitrogenative ring opening of N-benzyl-benzotriazoles was achieved under mild conditions. The resultant aryl radicals bearing an ortho-imine unit undergo intramolecular cyclization with arenes, providing a series of 6-substituted phenanthridines efficiently. The generation of biaryl ketone side-products via the extrusion of benzotriazole can be significantly suppressed by using 10% (volume fraction) oxygen as the oxidant.

Key words: benzotriazole, denitrogenative, aryl radical, phenanthridine, visible light photoredox catalysis