Hydrochloric Acid → 3-(trifluoromethyl)-5H,6H,7H,8H-[1,2,4]triazolo[4,3-a]pyridine-7-carboxylic acid

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Reaction Steps

To a solution of ethyl 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridine-7-carboxylate (2.28 g, 8.662 mmol) in THF (17 mL) was added 4N LiOH.H2O (726.9 mg, 17.324 mmol) in water (4 mL), then the mixture was stirred at room temperature for 2 h, then acidified with 1N HCl to pH=3. The resulting mixture was extracted with EA and the aqueous phase was directly drying to give 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridine-7-carboxylic acid without further purification.

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