反应详情

4-(4-Chloro-benzenesulfonyl)-5,8-difluoro-2H-chromene (0.3 g, 0.88 mmole) was dissolved in 15 ml THF and 3-aminopropanol (1 ml) was added. The mixture was stirred at room temperature for 30 minutes. 50 saturated Na2CO3 solution and 50 ml EtOAc were added. The organic layer washed with water (50 ml), brine (50 ml), dried over Na2SO4 and concentrated. The product was purified by column (EtOAc/hexane from 50/50 to 100/0 in 45 minutes). Yield: 0.31 g, 84%. 1H NMR (CDCl3 400 MHz) δ 7.69 (d, J=8.8 Hz, 2H), 7.48 (d, J=8.1 Hz), 6.99 (td, J=9.5, 5.1 Hz, 1H), 6.38 (td, J=9.5, 3.7 HZ, 1H), 4.80 (dd, J=12.5, 2.9 Hz, 1H), 4.53 (s, 1H), 4.43 (d, J=11.8 Hz, 1H), 3.78 (s, 1H), 3.61 (t, J=5.9 Hz, 2H), 2.86-2.71 (m, 2H), 2.25 (bs, 1H), 1.57 (p, J=5.9 Hz, 2H).

1. washThe organic layer washed with water (50 ml), brine (50 ml)
2. dry with materialdried over Na2SO4
3. concentrationconcentrated
4. customThe product was purified by column (EtOAc/hexane from 50/50 to 100/0 in 45 minutes)