Hydrochloric Acid → 5-Fluoro-1-isopropyl-1H-indazole-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of ethyl 5-fluoro-1-isopropyl-1H-indazole-3-carboxylate (125 mg, 0.5 mmol, step 1 of Example 11) in tetrahydrofuran (8 mL) was added 1N aqueous sodium hydroxide solution (1.0 mL, 1.0 mmol) at room temperature. The resulting mixture was stirred at 60° C. for 20 h. The mixture was acidified with 2 N hydrochloric acid (1 mL) and extracted with ethyl acetate (50 mL×3). The combined organic layer was dried over sodium sulfate, and concentrated under reduced pressure to give 106 mg (95%) of the title compound as a white amorphous solid.

Provenance & Evidence