有机化学 ›› 2022, Vol. 42 ›› Issue (11): 3684-3692.DOI: 10.6023/cjoc202205030 上一篇    下一篇

研究论文

无金属催化的双C—H功能化N-氰基苯并咪唑合成苯并咪唑并[1,2-c]喹唑啉衍生物

田晓京a, 范禛禛a, 姜思a, 李志伟a,*(), 李江胜a,*(), 张跃飞a, 卢翠红a, 刘卫东b   

  1. a长沙理工大学化学化工学院 细胞化学湖南省重点实验室 长沙 410114
    b湖南化工研究院 国家农药创制工程技术研究中心 长沙 410007
  • 收稿日期:2022-05-18 修回日期:2022-07-08 发布日期:2022-08-10
  • 通讯作者: 李志伟, 李江胜
  • 基金资助:
    农用化学品湖南省重点实验室开放课题(HKLA-OF2020001); 长沙市自然科学基金(kq2202185); 长沙市自然科学基金(2202184); 国家级大学生创新创业训练计划(202010536017)

Metal-Free Synthesis of Benzimidazo[1,2-c]quinazolines from N-Cyanobenzimidazoles via Double C—H Functionalizations

Xiaojing Tiana, Zhenzhen Fana, Si Jianga, Zhiwei Lia(), Jiangsheng Lia(), Yuefei Zhanga, Cuihong Lua, Weidong Liub   

  1. aHunan Provincial Key Laboratory of CytoChemistry, School of Chemistry and Chemical Engineering, Changsha University of Science & Technology, Changsha 410114
    bNational Engineering Research Center for Agrochemicals, Hunan Research Institute of Chemical Industry, Changsha 410007
  • Received:2022-05-18 Revised:2022-07-08 Published:2022-08-10
  • Contact: Zhiwei Li, Jiangsheng Li
  • Supported by:
    Hunan Provincial Key Laboratory of Agricultural Chemicals(HKLA-OF2020001); Changsha Municipal Natural Science Foundation(kq2202185); Changsha Municipal Natural Science Foundation(2202184); National Undergraduate Training Programs for Innovation and Entrepreneurship of China(202010536017)

在无金属、无任何添加剂的条件下, 通过过氧化物介导的双C—H功能化, 建立了一种绿色高效的合成苯并咪唑[1,2-c]喹唑啉的方法. 该方法经历了C-中心自由基和N-中心自由基之间的接力串联环化过程, 适用于多种环(硫)醚、乙二醇醚和环烷烃. 需要指出的是, 目标化合物具有良好的杀虫和杀菌活性, 特别是对粘虫具有显著的生物活性.

关键词: 双C—H功能化, 自由基串联环化, 氰胺, 苯并咪唑, 喹唑啉

A green and efficient method for synthesis of privileged benzimidazo[1,2-c]quinazoline scaffolds is developed through the double C—H functionalizations mediated by peroxides under metal-free conditions without any additives. This protocol undergoes a radical cascade cyclization process involving the relay between C-centered radicals and N-centered radicals and is well applicable to a variety of cyclic (thio)ethers, glycol ethers and cyclic alkanes. Noteworthily, the title compounds display significant insecticidal and fungicidal activities, especially to armyworm.

Key words: double C—H functionalization, radical cascade cyclization, cyanamide, benzimidazole, quinazoline