Lithium hydroxide, monohydrate → 5-(2-(dimethylamino)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl)-1-methyl-1H-pyrazole-4-carboxylic acid

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Reaction Conditions

Reaction Steps

A mixture of ethyl 5-(2-(dimethylamino)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl)-1-methyl-1H-pyrazole-4-carboxylate (1.24 g, 3.47 mmol) and lithium hydroxide monohydrate (291 mg, 6.94 mmol) in methanol (20 ml) and water (5 ml) is stirred for 4 hours at 50° C. The solvent is evaporated. The brown oily residue is dissolved in water and acidified to pH=5 with 2N aqueous hydrochloric acid (3.47 ml). The precipitated off-white solid is collected by filtration, dissolved in methanol and evaporated affording 5-(2-(dimethylamino)-[1,2,4]triazolo[1,5-a]pyridin-7-ylcarbamoyl)-1-methyl-1H-pyrazole-4-carboxylic acid (1.09 g, 95.3%) as an off-white solid. Mp.: >250° C. MS: m/z=328.0 (M−H+).

Provenance & Evidence