Hydrochloric Acid → 6-hydroxy-1-oxo-3-phenyl-1H-indene-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

6-Hydroxy-1-oxo-3-phenyl-1H-indene-2-carboxylic acid methyl ester (2.6 g, 9.28 mmol) obtained in Step 1 was dissolved in dichloroethane, and boron tribromide methyl sulfide (6.0 mL, 27.84 mmol) was added thereto. The mixture was refluxed for 2 hrs at 90° C., cooled in an ice bath, neutralized using sodium bicarbonate, and adjusted to pH 2 using 6N hydrochloric acid. The resulting mixture washed successively with dichloromethane and water. The organic layer was separated, dried over anhydrous MgSO4, concentrated under a reduced pressure and recrystallized to obtain 1.2 g of the titled compound (yield: 48.6%).

Provenance & Evidence