Sodium Hydroxide → 6-bromo-1-cyclopentyl-1H-indazole-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of methyl 6-bromo-1-cyclopentyl-1H-indazole-4-carboxylate (3 g, 9.28 mmol) in ethanol (30 mL), aqueous NaOH solution (0.56 g in 3 mL water, 13.93 mmol) was added and reaction stirred at 60° C. for 4 h. On completion, ethanol was removed under reduced pressure and residue acidified with 1N HCl to pH 6. The resulting precipitate was filtered, washed with water and dried to 6-bromo-1-cyclopentyl-1H-indazole-4-carboxylic acid (2.3 g, 80.4%).

Provenance & Evidence