Methanol → 5-[2-(3-methoxy-phenyl)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl]-1-methyl-1H-pyrazole-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-[2-(3-methoxy-phenyl)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl]-1-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (3.5 g, 8.33 mmol) in a mixture of THF (20 ml), MeOH (14 ml) and water (7 ml) was added LiOH×H2O (1.0 g, 25.0 mmol) at 0° C. The reaction mixture was stirred at 25° C. for 4 h. Solvents were removed in vacuum and the resultant crude material was diluted with water (150 ml). The aqueous layer was washed with ether (2×100 ml), cooled to 0° C., and slowly acidified (pH 5) with aqueous 1N HCl solution under stirring. The resultant precipitated solid was filtered and dried under vacuum to give 5-[2-(3-methoxy-phenyl)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl]-1-methyl-1H-pyrazole-4-carboxylic acid as white solid (5.9 g; crude, quant). LC-MS: m/z=393.0 [M+H]+.

Provenance & Evidence