Hydrochloric Acid → 2,5-Dimethyl-7-[(2,3,6-trifluorobenzyl)oxy]pyrazolo[1,5-a]pyridine-3-carboxylic Acid

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Reaction Conditions

Reaction Steps

700 mg (1.81 mmol) of ethyl 2,5-dimethyl-7-[(2,3,6-trifluorobenzyl)oxy]pyrazolo[1,5-a]pyridine-3-carboxylate from Example 9A were initially charged in 18 ml of dioxane and heated to 90° C. 4.5 ml of dioxane and 7.25 ml (14.50 mmol) of 2 N aqueous sodium hydroxide solution were added, and the reaction mixture was stirred at 90° C. for two days. Another 3.63 ml (7.26 mmol) of 2 N aqueous sodium hydroxide solution were added and the mixture was stirred at 90° C. for a further 2 hours. The reaction solution was admixed with 15 ml of 1 N aqueous hydrochloric acid and stirred for 30 min. In the course of this, solids precipitated out. This suspension was filtered, and the solids filtered off were washed with a little water and dried under high vacuum. 358 mg of the target compound were obtained (54% of theory).

Provenance & Evidence