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Condensed Pyridazines. Part I. Synthesis of 2-Oxo-2H-pyrano[2,3-D]-pyridazine and 2-Oxo-2H-pyrano[2,3-c] pyridazine

✍ Scribed by Isamu Maeba; Masahiko Ando; Shigetaka Yoshina The Late; Raymond N. Castle


Book ID
112125570
Publisher
Journal of Heterocyclic Chemistry
Year
1979
Tongue
English
Weight
210 KB
Volume
16
Category
Article
ISSN
0022-152X

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## Abstract The key 3-(2-oxo-2H-chromen-3-yl)-2-oxo-2H,5H-pyrano[3,2-c]chromen-5-yl acetates 3 were synthesized in high yields by cyclocondensation of 4-oxo-4H-chromen-3-carbaldehydes 1 with coumarin-3-acetic acids 2 under mild conditions. The reaction pathway involves aldol condensation and subseq