反应详情

A mixture of ethyl 2-ethyl-4-[4-(methylsulfonyl)phenoxy]-1-benzofuran-6-carboxylate (0.80 g, 2.1 mmol) and KOH (0.35 g, 6.3 mmol) in MeOH (40 mL) and water (4 mL) was heated to reflux overnight. The reaction was monitored by TLC (petroleum ether/EtOAc 4:1). The reaction mixture was concentrated to dryness and poured into water (50 mL). The aqueous layer was acidified to pH˜2 with concentrated HCl (4 mL) and extracted with EtOAc (50 mL×3). The organic layer was washed with brine (50 mL×2), dried over Na2SO4 and concentrated to afford the desired compound (0.70 g, 94%) as an off-white solid.

1. temperaturewas heated
2. temperatureto reflux overnight
3. concentrationThe reaction mixture was concentrated to dryness
4. additionpoured into water (50 mL)
5. extractionextracted with EtOAc (50 mL×3)
6. washThe organic layer was washed with brine (50 mL×2)
7. dry with materialdried over Na2SO4
8. concentrationconcentrated