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1. WO2000010978 - METHOD FOR PREPARING 1-ALKYL-PYRAZOL-5-CARBOXYLIC ACID ESTERS III

Publication Number WO/2000/010978
Publication Date 02.03.2000
International Application No. PCT/EP1999/005641
International Filing Date 04.08.1999
Chapter 2 Demand Filed 22.02.2000
IPC
C07D 231/14 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
231Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
02not condensed with other rings
10having two or three double bonds between ring members or between ring members and non-ring members
14with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
CPC
C07D 231/14
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
231Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
02not condensed with other rings
10having two or three double bonds between ring members or between ring members and non-ring members
14with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
Applicants
  • BAYER AKTIENGESELLSCHAFT [DE]/[DE] (AllExceptUS)
  • MÜLLER, Nikolaus [DE]/[DE] (UsOnly)
  • MATZKE, Michael [DE]/[DE] (UsOnly)
Inventors
  • MÜLLER, Nikolaus
  • MATZKE, Michael
Common Representative
  • BAYER AKTIENGESELLSCHAFT
Priority Data
198 37 067.917.08.1998DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZUR HERSTELLUNG VON 1-ALKYL-PYRAZOL-5-CARBONSÄUREESTERN III
(EN) METHOD FOR PREPARING 1-ALKYL-PYRAZOL-5-CARBOXYLIC ACID ESTERS III
(FR) PROCEDE DE PREPARATION D'ESTERS III D'ACIDE 1-ALKYLE-PYRAZOLE-5-CARBOXYLIQUE
Abstract
(DE)
1-Alkyl-pyrazol-5-carbonsäureester werden mit überraschend geringen Anteilen an 1-Alkyl-pyrazol-3-carbonsäureestern erhalten, wenn man einen 2,4-Diketoester und/oder ein Enolat davon mit einem Alkylhydrazin und/oder einem entsprechenden Alkylhydraziniumsalz, gegebenenfalls in Gegenwart von einem Lösungsmittel und/oder Wasser so umsetzt, daß während mindestens 90 % der Umsetzung freies Alkylhydrazin vorliegt.
(EN)
The invention relates to a method for preparing 1-alkyl-pyrazol-5-carboxylic acid esters III which contain a surprisingly small fraction of 1-alkyl-pyrazol-3-carboxylic acid esters, by reacting a 2,4-diketoester and/or enolate thereof with an alkylhydrazine and/or a corresponding alkylhydrazynium, possibly in the presence of a solvent and/or water, in such a way that free alkylhydrazine is present during at least 90 % of the reaction.
(FR)
Des esters III d'acide 1-alkyle-pyrazole-5-carboxylique qui possèdent une fraction étonnamment faible d'esters d'acide 1-alkyle-pyrazole-3-carboxylique sont obtenus lorsque l'on fait réagir un 2,4-dicétoester et/ou énolat de ces derniers avec une alkylhydrazine et/ou un sel correspondant d'alkylhydrazynium, éventuellement en présence d'un solvant et/ou d'eau, de manière telle que de l'alkylhydrazine libre soit présente pendant au moins 90 % de la réaction.
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