反应详情

To a solution of compound 14 (0.391 g, 1.0 mmol) in a mixture of MeOH (10 ml) and water (10 ml) was added LiOH—H2O (0.839 g, 20.0 mmol), and the mixture was stirred at room temperature for 3 hour. Then the reaction mixture was acidified with 1N HCl dropwise to pH 5 and extracted with EtOAc. The organic layer was washed with water and saturated brine and dried over Na2SO4. The solvent was evaporated to give compound 18 (0.322 g, 85.6%). 1H NMR (300 MHz, DMSO-d6) δ12.3 (1H, s), 8.72 (1H, s), 8.33 (1H, d, J=7.6 Hz), 8.16 (1H, dd, J=7.9, 2.8 Hz), 7.91 (1H, s), 7.72 (1H, t, J=8.0 Hz), 2.45 (2H, t, J=6.5 Hz), 2.19 (2H, t, J=5.7 Hz), 1.60 (2H, brs), 1.49 (2H, t, J=6.3 Hz), 1.30-1.18 (4H, m). 13C NMR (75 MHz, DMSO-d6) M75.3, 172.5, 159.2, 149.1, 147.1, 136.6, 132.5, 131.2, 123.0, 120.9, 111.2, 35.7, 34.4, 31.2, 29.1, 25.3, 25.1.

1. extractionextracted with EtOAc
2. washThe organic layer was washed with water and saturated brine
3. dry with materialdried over Na2SO4
4. customThe solvent was evaporated