Chinese Journal of Organic Chemistry ›› 2022, Vol. 42 ›› Issue (11): 3863-3869.DOI: 10.6023/cjoc202205040 Previous Articles     Next Articles

ARTICLES

I2催化下通过2-氨基吡啶和N-对甲苯磺酰腙氧化偶联反应合成1,2,4-三唑[4,3-a]吡啶

陈永欣a, 郭鑫b, 刘亚凤b, 杨雪莹b, 陈保华b,*()   

  1. a中国科学院西北生态环境资源研究院 兰州 730000
    b兰州大学功能有机分子化学国家重点实验室 兰州 730000
  • 收稿日期:2022-05-23 修回日期:2022-06-24 发布日期:2022-07-05
  • 通讯作者: 陈保华
  • 基金资助:
    国家自然科学基金(42002174); 甘肃省自然科学基金(20JR10RA030); 宁夏重点研发(2019BEB04028)

Synthesis of 1,2,4-Triazolo[4,3-a]pyridines by I2-Catalyzed Oxidative Coupling of 2-Aminopyridines with N-Tosylhydrazones

Yongxin Chena, Xin Guob, Yafeng Liub, Xueying Yangb, Baohua Chenb()   

  1. aNorthwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000
    bState Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000
  • Received:2022-05-23 Revised:2022-06-24 Published:2022-07-05
  • Contact: Baohua Chen
  • Supported by:
    National Natural Science Foundation of China(42002174); Natural Science Foundation of Gansu Province(20JR10RA030); Ningxia Key Research and Development Program(2019BEB04028)

An efficient synthesis of 1,2,4-triazolo[4,3-a]pyridines from N-tosylhydrazones and 2-aminopyridines via S—N/ C—N bond cleavage and new C—N bond formation has been developed. The procedure, using I2 as the catalyst, is a simple, general, and efficient protocol, which could be applied to various substrates in moderate to good yields.

Key words: tert-butyl hydroperoxide (TBHP), 2-aminopyridine, N-tosylhydrazone, cyclization, 1,2,4-triazolo[4,3-a]pyridine