反应详情

To a solution of methyl(6-hydroxy-1-benzofuran-3-yl)acetate (11.4 g, 55.3 mmol) in methanol (100 mL) was added 10% palladium-carbon (50% water-containing product, 2 g), and the mixture was stirred at room temperature for 18 hr under hydrogen atmosphere (balloon pressure). The catalyst was filtered off, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=20:80-50:50), and the obtained solid was recrystallized from ethyl acetate-hexane to give the title compound (8.74 g, yield 76%) as colorless prisms.

1. filtrationThe catalyst was filtered off
2. concentrationthe filtrate was concentrated under reduced pressure
3. customThe residue was purified by silica gel column chromatography (ethyl acetate:hexane=20:80-50:50)
4. customthe obtained solid was recrystallized from ethyl acetate-hexane