Water → 2-(2-Furanyl)-5-methanesulfonylindole

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To a suspension of the compound obtained in Example 8 (5) (2.00 g), bistriphenylphosphine palladium dichloride (321 mg), cuprous iodide (87.0 mg) and triethylamine (1.38 g) in N,N-dimethylformamide (46 ml), a solution of 2-ethynylfuran (842 mg) in N,N-dimethylformamide (46 ml) was slowly added dropwise under nitrogen atmosphere and the mixture was stirred at 60° C. for 3 hours. The reaction solution was then poured into water, extracted with chloroform, washed with a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was separated using silica gel column chromatography (methanol:chloroform=1:100). To a solution of the obtained colorless amorphous compound (1.10 g) in methanol (28 ml) was added a 1N aqueous potassium hydroxide solution (5.52 ml) and the mixture was stirred at 60° C. for 1 hour. After completion of the reaction, the reaction solution was concentrated under reduced pressure. The resulting residue was poured into water, extracted with chloroform, washed with a saturated aqueous NaCl solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was separated using silica gel preparative thin-layer chromatography (methanol:chloroform=1:20) to obtain 350 mg of the desired product as a brown crystal.

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