Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (2): 20240302.doi: 10.7503/cjcu20240302

• Organic Chemistry • Previous Articles     Next Articles

Synthesis of Difluoromethyl Pyrazoles by [3+2] Cycloaddition Reaction of Difluoroacetohydrazonoyl Bromides with Vinyl Sulfonefones

LIU Xiaokang, ZHOU Yuxiu, LI Xiaoyong, LUO Wenjing, WANG Kehu, WANG Junjiao, HUANG Danfeng, HU Yulai()   

  1. College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,China
  • Received:2024-06-24 Online:2025-02-10 Published:2024-11-02
  • Contact: HU Yulai E-mail:huyl@nwnu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22061037)

Abstract:

A series of 3-difluoromethyl pyrazole compounds was synthesized via a [3+2] cycloaddition reaction of difluoroacetohydrazonoyl bromides with vinyl sulfones. The method has the advantages of high regioselectivity, mild reaction conditions and simple operation, providing a new method for the synthesis of 3-difluoromethyl pyrazole compounds. Meanwhile, it further extends the application of difluoroacetohydrazonoyl bromides as difluoromethyl building blocks in synthesis of difluoromethyl N-heterocycle compounds.

Key words: Difluoromethyl pyrazoles, Difluoroacetohydrazonoyl bromides, Vinyl sulfones, [3+2] Cycloaddition

CLC Number: 

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