Method for preparing 1-alkyl-pyrazol-5-carboxylic acid...

Details Method for preparing 1-alkyl-pyrazol-5-carboxylic acid... Method for preparing 1-alkyl-pyrazol-5-carboxylic acid...

C - Chemistry, Metallurgy

07

D

C07D 231/14 (2006.01)

Patent

CA 2340704

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.

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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