(Diethylamino)sulfur trifluoride → 2-Fluoromethyl-5-methyl-2,3,6,7-tetrahydrofuro-[2,3-f]quinoline-7-one

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2-Hydroxymethyl-5-methyl-2,3,6,7-tetrahydrofuro[2,3-f]quinoline-7-one (500 mg) was suspended in anhydrous methylene chloride (20 ml). To the suspension, diethylaminosulfur trifluoride (DAST) (372 mg) was added while stirring and cooling at -78° C. Subsequently, the mixture was stirred at room temperature for 30 minutes. After completion of the reaction, methylene chloride was further added thereto, and washed with aqueous sodium bicarbonate solution, and aqueous NaCl solution in this order. After drying, the solvent was distilled off to obtain 487 mg of a crude product. The crude product was purified by silica gel column chromatography (eluent=chloroform:methanol=400:1-20:1), and then by separative thin layer chromatography (developer=chloroform:methanol=10:1) to obtain a purified product, which was subjected to recrystallization using a solvent mixture of chloroform and n-hexane to obtain 163 mg of colorless needles (32%).

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