PROCESS FOR PRODUCING N-SUBSTITUTED 3-HYDROXYPYRAZOLES

PROCESS FOR PRODUCING N-SUBSTITUTED 3-HYDROXYPYRAZOLES

N-substituted 3-hydroxypyrazoles of the formula (I) where R1 is unsubstituted or substituted alkyl, aryl or heteroaryl and R2, R3 is hydrogen, cyano, halogen or unsubstituted or substituted alkyl, aryl or heteroaryl, are prepared by oxidation of a corresponding pyrazolidin-3-one with atmospheric oxy...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KLEIN ULRICH, KONIG HARTMANN, ELLER KARSTEN, GOTZ NORBERT
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:N-substituted 3-hydroxypyrazoles of the formula (I) where R1 is unsubstituted or substituted alkyl, aryl or heteroaryl and R2, R3 is hydrogen, cyano, halogen or unsubstituted or substituted alkyl, aryl or heteroaryl, are prepared by oxidation of a corresponding pyrazolidin-3-one with atmospheric oxygen in the presence of a metal salt in an essentially pH-neutral medium.