PROCESS FOR PREPARING N-SUBSTITUTED 3-HYDROXYPYRAZOLES

PCT No. PCT/EP96/02891 Sec. 371 Date Jan. 8, 1998 Sec. 102(e) Date Jan. 8, 1998 PCT Filed Jul. 2, 1996 PCT Pub. No. WO97/03969 PCT Pub. Date Feb. 6, 1997N-substituted 3-hydroxypyrazoles of the formula I where R1 is unsubstituted or substituted alkyl, aryl or heteroaryl and R2, R3 is hydrogen, cyano,...

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Bibliographic Details
Main Authors KONIG HARTMANN DR, GOTZ NORBERT DR, ELLER KARSTEN DR, KLEIN ULRICH DR
Format Patent
LanguageCzech
English
Published 16.09.1998
Edition6
Subjects
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Summary:PCT No. PCT/EP96/02891 Sec. 371 Date Jan. 8, 1998 Sec. 102(e) Date Jan. 8, 1998 PCT Filed Jul. 2, 1996 PCT Pub. No. WO97/03969 PCT Pub. Date Feb. 6, 1997N-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.
Bibliography:Application Number: CZ19980000074