Ethyl 3-(3,4-methylenedioxyphenyl)1-oxoindene-2-carboxylate → 1-(3-Methoxyphenyl)-3-(3,4-methylenedioxyphenyl)indane-2-carboxylic acid

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Reaction Steps

Ethyl (1RS)-1-Hydroxy-1-(3-methoxyphenyl)-3-(3,4-methylenedioxyphenyl)indene-2-carboxylate. To a solution of ethyl 3-(3,4-methylenedioxyphenyl)-1-oxoindene-2-carboxylate (100 mg, 0.31 mmol) in THF (2 ml) under an argon atmosphere at 0° C. was added a solution of freshly prepared 3-methoxyphenyl magnesium bromide (0.31 mmol). After stirring for 15 min, additional 3-methoxyphenyl magnesium bromide (0.06 mmol) was added. Stirring was continued for 45 min, at which time thin layer chromatographic analysis indicated that the reaction was incomplete. Additional 3-methoxyphenyl magnesium bromide (0.12 mmol) was added. After string for 2 h more, the mixture was partitioned between 3M HCl and EtOAc. The organic extract was washed successively with H2O, 5% aqueous NaHCO3, H2O and saturated aqueous NaCl. The solvent was removed in vacuo, and the residue was purified by flash chromatography, eluting with 15% EtOAc/ hexanes to afford the title compound (150 mg, 100%).

Provenance & Evidence