反应详情

温度

0 °C

The compound of Example 7 (100.0 mg, 0.23 mmol, 1 equiv) was dissolved in THF/MeOH/H2O (3:1:1 2.3 mL) and the solution was cooled to 0° C. followed by addition of solid lithium hydroxide (5.4 mg, 0.23 mmol, 1 equiv). The reaction mixture was allowed to reach rt and stirred for 1 hour. It was acidified with 0.1 M aqueous HCl solution to pH 3 and extracted three times with ethyl acetate. The combined organic extracts were dried over Na2SO4 and the solvents were removed under reduced pressure and the remaining crude product was purified by chromatography (SiO2; toluene/EtOH/AcOH 95:4:1). Yield 23.7 mg, 24.5%. 1H NMR (DMSO; 200 MHz) δ 13.05 (brs, 1H); 8.59 (s, 1H); 7.72 (s, 1H); 7.05 (d, 1H); 7.41-7.22 (m, 3H); 7.17-7.03 (m, 3H); 6.91 (d, 1H); 6.22 (dd, 1H); 4.49-4.81 (m, 1H); 4.30-4.19 (m, 2H); 4.0 (q, 2H); 3.04 (q, 2H); 1.49 (sextett, 2H); 1.19 (t, 3H); 0.94 (t, 3H). MS (EI) 430 (M+H), 345, 210.

1. customto reach rt
2. extractionextracted three times with ethyl acetate
3. dry with materialThe combined organic extracts were dried over Na2SO4
4. customthe solvents were removed under reduced pressure
5. customthe remaining crude product was purified by chromatography (SiO2; toluene/EtOH/AcOH 95:4:1)