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References (6)
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Y. Sato, Y. Shimoji, K. Endo, H. Nishino, H. Koike, S. Kumakura (1978)
[Synthetic studies on cardiovascular agents. III. Syntheses of pyrano-[2,3-c]pyrazolone derivatives (author's transl)].Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan, 98 3
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[Studies on heterocyclic compounds. XXI. Synthesis of furo(2,3-d)pyridazine derivatives. (8). Synthesis of 4-oxo-5,7-disubstituted-4,5-dihydrofuro(2,3-d) pyridazines and its nitration (author's transl)].Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan, 94 8
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Studies on Heterocyclic Compounds. XVIII. Synthesis of Furo [2, 3-d] pyridazine Derivatives. (6). Nitration of 4-Oxo-7-chloro-4, 5-dihydrofuro [2, 3-d] pyridazineChemical & Pharmaceutical Bulletin, 20
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- Publisher
- Wiley
- Copyright
- Copyright © 1979 Journal of Heterocyclic Chemistry
- ISSN
- 0022-152X
- eISSN
- 1943-5193
- DOI
- 10.1002/jhet.5570160210
- Publisher site
- See Article on Publisher Site
Abstract
The reaction of 4,7‐diehlorofuro(2,3‐d)pyridazine (1) with potassium cyanide in DMSO gave two products, (E)‐3,6‐diehloro‐5‐(2‐cyanovinyl)‐4‐hydroxypyridazine (II) and 5,8‐dichloro‐2‐oxo‐2H‐pyrano(2,3‐d)pyridazine (III) as a result of ring opening or ring expansion. A new ring system, 2‐oxo‐2H‐pyrano(2,3‐c)pyridazines (IX, XII, XIII) was obtained from 5,8‐dichloro‐3‐methyl‐2‐oxo‐2H‐pyrano(2,3‐d)pyridazine (VI).
Journal
Journal of Heterocyclic Chemistry – Wiley
Published: Mar 1, 1979