Process for the Regioselective Preparation of 1-Alkyl-3-haloalkylpyrazole-4-carboxylic Acid Derivatives

摘要

The present invention relates to a process for the regioselective synthesis of 1-alkyl-3-halo-alkylpyrazole-4-carboxylic acid derivatives by cyclization of 2,3-disubstituted acrylic acid derivatives with hydrazines in the presence of carbonyl compounds.