3‐Methylpyrazolo [1,2‐ a ] pyridazin‐1‐one. Selenium derivatives of 5,8‐dihydropyrazolo[1,2‐ a ]pyridazine | Zendy

Farnum Donald G. | Zendy; Au Andrew T. | Zendy; Rasheed Khalid | Zendy

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3‐Methylpyrazolo [1,2‐ a ] pyridazin‐1‐one. Selenium derivatives of 5,8‐dihydropyrazolo[1,2‐ a ]pyridazine

Author(s) -

Farnum Donald G.,

Au Andrew T.,

Rasheed Khalid

Publication year - 1971

Publication title -

journal of heterocyclic chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.321

H-Index - 59

eISSN - 1943-5193

pISSN - 0022-152X

DOI - 10.1002/jhet.5570080105

Subject(s) - chemistry , pyridazine , pyrazolones , dehydrogenation , selenium , medicinal chemistry , organic chemistry , catalysis

The dehydrogenation of the known 3‐methyl‐5,8‐dihydropyrazolo[1,2‐ a ]pyridazin‐1‐one (2) to the ten π electron heteroaromatic 3‐methylpyrazolo[1,2‐ a ]pyridazin‐1‐one ( 3 ) is reported. Conversions of the pyrazolone 2 to the pyrazoloselenone 6 via the chloropyrazolium chloride 7 , and of pyrazolones 2 and 3 and pyrazoloselenone 6 into the corresponding O or Se ethyl pyrazolium fluoroborates 5, 4 , and 8 by triethyloxonium fluoroborate are also described.

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