Sodium Carbonate → 3-cyclopentyl-2-[4-(1H-indol-5-yl)-phenyl]-propionic acid methyl ester

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A slurry of dichlorobis(triphenylphosphine)palladium(II) (119 mg, 0.17 mmol) in 1,2-dimethoxyethane (10 mL) was treated with 3-cyclopentyl-2-(4-iodo-phenyl)-propionic acid methyl ester (1.00 g, 2.79 mmol). The reaction slurry was stirred at 25° C. for 10 min and then treated with a mixture of 5-indolylboronic acid (670 mg, 4.19 mmol) in water (5 mL) and a 2M aqueous sodium carbonate solution (2.8 mL, 5.58 mmol). The resulting reaction mixture was heated under reflux for 2 h. The reaction mixture was allowed to cool to 25° C. and then filtered to remove the catalyst. The filtrate was partitioned between water (50 mL) and methylene chloride (50 mL), and the layers were separated. The aqueous layer was further extracted with methylene chloride (50 mL). The combined organic extracts were dried over magnesium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/2 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-[4-(1H-indol-5-yl)-phenyl]-propionic acid methyl ester (347 mg, 36%) as a light brown oil: EI-HRMS m/e calcd for C23H25NO2 (M+) 347.1885, found 347.1887.

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