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

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

C - Chemistry, Metallurgy

07

D

C07D 231/00 (2006.01) C07D 231/14 (2006.01)

Patent

CA 2336310

The present invention relates to a method for preparing 1-alkyl-pyrazol-5- carboxylic acid esters, wherein said method involves reacting the enolate of a 2,4-diketocarboxylic acid ester with a salt of N-alkylhydrazinium in the presence of water and a solvent. This method can be used for readily preparing 1-alkyl-pyrazol-5-carboxylic acid esters at a low cost, while minimising the formation of unwanted isomers.

L'invention concerne la préparation d'esters d'acide 1-alkyle-pyrazol-5-carboxylique, qui sont obtenus par réaction de l'énolat d'un ester d'acide 2,4-dicétocarboxylique en présence d'un solvant et d'eau avec un sel de N-alkylhydrazinium. Ce procédé permet de préparer de manière particulièrement économique des esters d'acide 1-alkyle-pyrazol-5-carboxylique, de manière aisée et avec une formation minime d'isomères indésirables.

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