Method for producing N-substituted 3-hydroxypyrazoles

Method for producing N-substituted 3-hydroxypyrazoles

A process is described for preparing N-substituted 3-hydroxypyrazoles of the formula (I) where R1 is unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl or heteroaryl and R2, R3 are hydrogen, cyano, halogen and unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl...

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Hauptverfasser: KLINTZ RALF, KONIG HARTMANN, GOTZ ROLAND, TELES JOAQUIM HENRIQUE, RACK MICHAEL, WAHL JOSEPH, VOGELBACHER UWE JOSEF, WINGERT HORST, KEIL MICHAEL
Format: Patent
Sprache:eng ; slo
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:A process is described for preparing N-substituted 3-hydroxypyrazoles of the formula (I) where R1 is unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl or heteroaryl and R2, R3 are hydrogen, cyano, halogen and unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl, aryl or heteroaryl, by oxidizing a corresponding pyrazolidin-3-one. Spôsob prípravy N-substituovaných 3-hydroxypyrazolov všeobecného vzorca (I) oxidáciou zodpovedajúcich pyrazolidín-3-ónov všeobecného vzorca (II). Pyrazolidin-3-ón, ktorý je rozpustný vo vode, sa vo vode v prítomnosti zásady a s použitím kyslíka ako oxidačného činidla oxiduje.ŕ