Tetrahydrofuran → 4-(1-(2,6-difluorophenyl)-4-oxo-4,5-dihydro-1H-pyrazolo[4,3-c]pyridin-3-yl)thiophene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a mixture of methyl 4-(1-(2,6-difluorophenyl)-4-oxo-4,5-dihydro-1H-pyrazolo[4,3-c]pyridin-3-yl)thiophene-2-carboxylate (32.0 mg) obtained in Example 36 in methanol (2 mL)/THF (2 mL)/water (2 mL) was added 8 M aqueous sodium hydroxide solution (0.026 mL) at 0° C. The reaction mixture was stirred at 90° C. for 2 hr. The reaction mixture was diluted with water, and the mixture was extracted with ethyl acetate. The organic layer was washed with 0.1 N hydrochloric acid, water and saturated brine, dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure to give the title compound (31.1 mg).

Provenance & Evidence