反应详情

A dichloromethane solution (30 ml) of methyl 5-fluoro-3-(4-methoxyphenyl)-4-oxo-8-propoxy-1,4-dihydroquinoline-2-carboxylate (5.0 g, 13 mmol) was cooled to −78° C., and hydrogenated diisobutylaluminium (DIBAL-H, 1M toluene solution, 30 ml) was added thereto dropwise under a nitrogen atmosphere. After completion of the addition, the mixture was stirred at the same temperature for 3 hours. The reaction mixture was heated to room temperature, and 5N sodium hydroxide was added thereto, followed by extraction with dichloromethane. The thus-obtained organic layer was washed with water, dried over sodium sulfate, and then concentrated under reduced pressure. The residue was purified using silica gel column chromatography (dichloromethane:methanol=10:1). The purified material was concentrated to dryness under reduced pressure, giving a yellow amorphous solid of 5-fluoro-2-hydroxymethyl-3-(4-methoxyphenyl)-8-propoxy-1H-quinolin-4-one (4.8 g, yield: 85%).

1. additionAfter completion of the addition
2. extractionfollowed by extraction with dichloromethane
3. washThe thus-obtained organic layer was washed with water
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified
7. concentrationThe purified material was concentrated to dryness under reduced pressure