Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (5): 502-511.DOI: 10.11944/j.issn.1000-0518.2020.05.190311

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Synthesis of Pyridazine Derivatives by Base-Catalyzed Three-Component Reaction of Aldehyde, Malononitrile and Phthalhydrazide

CHEN Chen,RUAN Hongli,Lü Le,SONG Zhixi,Lü Chengwei(),AN Yue   

  1. College of Chemistry and Chemical Engineering,Liaoning Normal University, Dalian,Liaoning 116029,China
  • Received:2019-11-19 Accepted:2020-02-20 Published:2020-05-01 Online:2020-04-29
  • Contact: LÜ Chengwei
  • Supported by:
    Supported by the Department of Science and Technology of Liaoning Province(No.2019-MS-215, No.2019-ZD-0470)

Abstract:

Catalytic amount of organic base triethylamine (Et3N) or inorganic base dipotassium hydrogen phosphate (K2HPO4·3H2O) is proved to effectively promote the three components reaction of aromatic aldehyde, malononitrile and phthalhydrazide under conventional heating conditions. As expected, introduction of water is favorable to the reaction. A series of 1H-pyrazole [1,2-b]pyridazine-5,10-diones derivatives was synthesized in the yield of 39%~97%. Both catalysts are soluble in water, and introduction of water also facilitate the separation of the catalyst after reaction. This approach also has advantages of mild reaction conditions, green environmental protection, simple operation and convenient post-treatment.

Key words: trimethylamine, dipotassium hydrogen phosphate trihydrate, base catalytic, multi-component reactions, phthalazines derivatives