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Note | Regular issue | Vol 57, No. 4, 2002, pp.723-731
Published online, 1st January, 1970
DOI: 10.3987/COM-01-9431
Simple Synthesis of Ring-fused Pyridazin-3-ones

Koichi Suzuki, Akihiro Senoh, and Kazunori Ueno*

*OL Project, Display Development Headquarters, Canon Inc., 30-2 Shimomaruko 3-chome, Ohta-ku, Tokyo 146-8501, Japan


Bicyclic and tricyclic pyridazin-3-ones, 6,7-dihydro-5H-cyclopenta-[e]-2H-pyridazin-3-one (5), 5,6,7,8-tetrahydrobenzo[e]-2H-pyridazin-3-one (6),9,10-dihydronaphtho[1,2-e]-2H-pyridazin-3-one (15) and 9,10-dihydronaphtho[1,2-e]-2-methylpyridazin-3-one (21) were prepared in a one-pot procedure by reacting hydrazine hydrate with a corresponding ketocarboxylic acid.