Verfahren zur Herstellung von 1-Alkyl-pyrazol-5-carbonsäureestern

Verfahren zur Herstellung von 1-Alkyl-pyrazol-5-carbonsäureestern

Preparation of 1-alkylpyrazole-5-carboxylic ester derivatives of formula (I) comprises reaction of an enolate of a 2,4-diketocarboxylic ester of formula (II) with a N-alkylhydrazinium salt of formula (III) in the presence of a solvent. R1-NH2-NH2 R5COO (III) R1, R4 = 1-6C alkyl, 3-7C cycloalkyl or o...

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Bibliographische Detailangaben
Hauptverfasser: KANELLAKOPOULOS, JOHANNES. DR., 41542 DORMAGEN, DE, HEISE, KLAUS-PETER. DR., 51519 ODENTHAL, DE, HEUER, LUTZ. DR., 41542 DORMAGEN, DE, SATTLER, ANDREAS. DR., 40229 DUESSELDORF, DE, MUELLER, NIKOLAUS. DR., 40789 MONHEIM, DE
Format: Patent
Sprache:ger
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:Preparation of 1-alkylpyrazole-5-carboxylic ester derivatives of formula (I) comprises reaction of an enolate of a 2,4-diketocarboxylic ester of formula (II) with a N-alkylhydrazinium salt of formula (III) in the presence of a solvent. R1-NH2-NH2 R5COO (III) R1, R4 = 1-6C alkyl, 3-7C cycloalkyl or optionally substituted 7-12C aralkyl; R2, R3 = H, 1-6C alkyl, 3-7C cycloalkyl or optionally substituted 7-12C aralkyl; M = metal ion equivalent; and R5 = anion of an organic acid together with the COO group.