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Synthesis 1990; 1990(6): 467-468
DOI: 10.1055/s-1990-26906
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A Convenient and Facile Synthetic Method for 5-Chloro-4-pyridazinones

Yasuhiro Kamitori* , Masaru Hojo, Ryōichi Masuda, Kazuyoshi Kawasaki, Shigeru Takata, Junya Ida
  • *Department of Industrial Chemistry, Faculty of Engineering, Kobe University, Kobe 667, Japan
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Publikationsdatum:
17. September 2002 (online)

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Substituted benzaldehyde, benzaldehyde and propanal tert-butyl(methyl)hydrazones were successfully acylated with trichloroacetyl chloride to afford 3-unsubstituted and 3-aryl-3-tert-butyl(methyl)hydrazono-1,1,1-trichloro-2-alkanones 2. Several 3-alkyl- or 3-aryl-1-tert-butyl-5-chloro-4-pyridazinones 4 were synthesized in good yields by thermally induced cyclization of 2 in refluxing toluene.