A Convenient Synthesis of 4-Acetyl-5-hydroxy-3-methyl-1-substituted Pyrazoles

A Convenient Synthesis of 4-Acetyl-5-hydroxy-3-methyl-1-substituted Pyrazoles

Reaction of 1-(5-hydroxy-3-methyl-1-substituted-4-pyrazolyl)-1,3-butanediones (1a-d) with 1-hydrazinophthalazine hydrochloride leads to the formation of 4-acetyl-5-hydroxy-3-methyl-1-substitutedpyrazoles (3a-d) along with 3-methyl-s-triazolo[3,4-a]phthalazine (4) in good yields.

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Veröffentlicht in:Synthetic communications 1994-10, Vol.24 (18), p.2645-2651
Hauptverfasser: Singh, Shiv P., Kumar, Devinder, Kapoor, Jitander K.
Format: Artikel
Sprache:eng
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Zusammenfassung:Reaction of 1-(5-hydroxy-3-methyl-1-substituted-4-pyrazolyl)-1,3-butanediones (1a-d) with 1-hydrazinophthalazine hydrochloride leads to the formation of 4-acetyl-5-hydroxy-3-methyl-1-substitutedpyrazoles (3a-d) along with 3-methyl-s-triazolo[3,4-a]phthalazine (4) in good yields.
ISSN:0039-7911
1532-2432
DOI:10.1080/00397919408010577