反应详情

Ethyl[5-fluoro-3-(4-methoxyphenyl)-4-oxo-8-propoxy-4H-quinolin-1-yl]acetate (4.0 g, 9.6 mmol) was dissolved in dichloromethane (20 ml). A 1M-boron tribromide dichloromethane solution (35 ml, 35 mmol) was added dropwise to the dissolution at −10° C. After stirring at the same temperature for 2 hours, water was added to the reaction mixture, followed by extraction with dichloromethane. The thus-obtained organic layer was concentrated under reduced pressure. The residue was purified using silica gel column chromatography (dichloromethane:methanol=50:1→15:1). The purified product was concentrated to dryness under reduced pressure, giving a yellow powder of ethyl[5-fluoro-3-(4-hydroxyphenyl)-4-oxo-8-propoxy-4H-quinolin-1-yl]acetate (2.7 g, yield: 57%).

1. extractionfollowed by extraction with dichloromethane
2. concentrationThe thus-obtained organic layer was concentrated under reduced pressure
3. customThe residue was purified
4. concentrationThe purified product was concentrated to dryness under reduced pressure