Methyl 4-phenyl-2-indancarboxylate → 4-Phenyl-2-indancarboxylic acid

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Reaction Steps

Methyl 4-bromo-2-indancarboxylate (510 mg), tributylphenyltin (881 mg), a tris(dibenzylideneacetone)dipalladium chloroform complex (41 mg) and tri-2-furylphosphine (19 mg) were dissolved in N-methylpyrrolidone (10 ml), and the mixture was stirred at 70° C. for 3 hours and allowed to cool. To the reaction solution was added a saturated potassium fluoride solution and the solution was stirred at room temperature for 30 minutes followed by filtering through Celite. The filtrate was extracted with ether. The organic layers was washed with saturated aqueous sodium bicarbonate and saturated brine and then dried over anhydrous magnesium sulfate. Then, the solvent was distilled away under a reduced pressure. The resultant residue was purified by column chromatography on silica gel (hexane: ethyl acetate=4:1) to obtain methyl 4-phenyl-2-indancarboxylate. The resultant ester was dissolved in methanol to which 1 N sodium hydroxide was added to hydrolyze. Methanol was distilled away under a reduced pressure. To the resultant residue was added 1 N hydrochloric acid. The product was extracted with ethyl acetate. The organic layer was washed with saturated brine and then dried over anhydrous magnesium sulfate. Then, the solvent was distilled away to obtain the title compound (351 mg) (melting point: 97-102° C.).

Provenance & Evidence