Hydrochloric Acid → 1-(4-fluoro-phenyl)-1H-indazole-4-carboxylic acid

Participants

Reaction Steps

To a stirred solution of 1-(4-fluoro-phenyl)-1H-indazole-4-carboxylic acid methyl ester (2.0 g, 7.4 mmol) in water (20 mL) and methanol (20 mL) is added a solution of 2N sodium hydroxide (10 mL). The solution is warmed at reflux for 1 hour. The solution is cooled to room temperature and acidified to pH 3-4 with 1N aqueous HCl. The mixture is filtered, and the resulting solid is washed with MeOH (30 mL) and dried to afford 1-(4-fluoro-phenyl)-1H-indazole-4-carboxylic acid.

Provenance & Evidence