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研究论文

光促进N-对甲苯磺酰腙的分子内C(sp3)-H/C=C插入环化反应研究

李金瑞a, 卫可悦a, 王花a,b,*   

  1. a第四军医大学(空军军医大学)药学系 化学制药学教研室 陕西西安 710032;
    b第四军医大学(空军军医大学)军事医疗创新中心 陕西西安 710032
  • 收稿日期:2026-01-19 修回日期:2026-03-18
  • 基金资助:
    国家自然科学基金(No. 22201303)、陕西省三秦英才引进计划-青年项目基金资助项目.

Light-induced intramolecular cyclization through insertion of N-tosylhydrazone into C(sp3)-H and C=C bonds

Li Jin-Ruia, Wei Ke-Yuea, Wang Huaa,b,*   

  1. aDepartment of Chemistry, School of Pharmacy, The Fourth Military Medical University (Air Force Medical University), Xi'an Shaaxi 710032;
    bMilitary Medical Innovation Center, The Fourth Military Medical University (Air Force Medical University), Xi'an, Shaaxi 710032
  • Received:2026-01-19 Revised:2026-03-18
  • Contact: *E-mail: wanghua87@fmmu.edu.cn
  • Supported by:
    National Natural Science Foundation of China (No. 22201303), Sanqin Talents Introduction Program of Shaanxi Province - Youth Project.

发展了一种在无过渡金属条件下,光促进的N-对甲苯磺酰腙分子内C(sp³)-H/C=C插入环化反应. 该反应以碳酸铯为碱,在温和条件下通过光激发腙阴离子生成高活性烷基重氮中间体,实现了对分子内C(sp³)-H键及C=C双键的高选择性插入,高效构建了20余种不同取代的[4.1.0]并环与苯并呋喃结构,最高收率达85%. 该策略具有良好的官能团兼容性与克级放大潜力. 机理研究表明,光激发腙阴离子的形成为反应的关键步骤.

关键词: 对甲苯磺酰腙, 光激发负离子, 卡宾插入sp3 C-H键反应, 卡宾插入C=C键反应, 分子内环化

We report herein a light-promoted, transition-metal-free intramolecular C(sp³)-H/C=C insertion cyclization of N-tosylhydrazones has been developed. Using cesium carbonate as the base, the reaction proceeds under mild conditions via photoexcited hydrazone anions to generate highly reactive alkyl diazo intermediates. This enables highly selective insertion into both intramolecular C(sp³)-H bonds and C=C double bonds, efficiently constructing over 20 differently substituted [4.1.0]-fused bicyclic and benzofuran frameworks with yields up to 85%. The strategy exhibits broad functional group tolerance and scalability to gram-scale. Mechanistic studies indicate that the formation of photoexcited hydrazone anions is the key step in the reaction pathway.

Key words: N-tosylhydrazone, photoexcited anions, carbene insertion into C(sp³)-H bonds, carbene insertion into C=C bonds, intramolecular cyclization