Process for the preparation of 1-alkyl-pyrazole-5-carboxylic...

Details Process for the preparation of 1-alkyl-pyrazole-5-carboxylic... Process for the preparation of 1-alkyl-pyrazole-5-carboxylic...

C - Chemistry, Metallurgy

07

D

C07D 231/14 (2006.01)

Patent

CA 2226768

1-alkyl-pyrazole-5-carboxylic acid esters are prepared by reacting the enolate of a 2,4-diketocarboxylic acid ester with an N-alkylhydrazinium salt in the presence of a solvent. This process allows a particularly economic preparation of 1-alkyl-pyrazole-5-carboxylic acid esters in a simple manner and with only little formation of undesirable isomers.

Des esters 1-alkyl-pyrazole-5-carboxyliques sont préparés en faisant réagir l'énolate d'un ester 2,4-dicétocarboxylique avec un sel de N-alkylhydrazinium en présence d'un solvant. Il s'agit d'un procédé simple et particulièrement économique pour préparer des esters 1-alkyl-pyrazole-5-carboxyliques; de plus, la formation d'isomères non recherchés est minimale.

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