W. Holzer, K. Hahn
Mar 1, 2003
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0
Influential Citations
14
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Journal
Journal of Heterocyclic Chemistry
Abstract
Treatment of 1,(3)-(di)substituted 4-benzoyl-5-hydroxypyrazoles with phosphorus oxychloride affords the corresponding 4-benzoyl-5-chloropyrazoles. Reaction of the latter with hydroxylamine leads to oximes, which can be cyclized to novel 3-phenyl-6H-pyrazolo[4,3-d]isoxazoles by treatment with sodium hydride in dimethyl formamide. Detailed nmr spectroscopic studies (1H, 13C) with all obtained compounds are presented.