反应详情

温度

30 °C

A mixture of 126a (150 mg, 0.20 mmol) and lithium hydroxide (72 mg, 3.0 mmol) in i-propanol/THF (5:3, 8.0 mL) and water (2.0 mL) was stirred at 30° C. for 1 h. The mixture was evaporated under reduced pressure and the residue was extracted with ethyl acetate (2×20 mL). The combined ethyl acetate extract was concentrated under reduced pressure and the residue was purified by prep-HPLC to afford 126 (45 mg, 33%) as a white solid. MS: [M+H]+ 682.9. 1H NMR (500 MHz, CHCl3) δ 8.60 (dd, J=2, 5 Hz, 1H), 8.03 (s, 1H), 7.87 (s, 1H), 7.54 (s, 1H), 7.37-7.35 (m, 1H), 7.14-7.12 (m, 1H), 6.96-6.94 (m, 1H), 6.82-6.80 (m, 1H), 6.31 (s, 1H), 4.77-4.71 (m, 2H), 4.67-4.62 (m, 2H), 4.58-4.55 (m, 1H), 4.41-4.40 (m, 1H), 4.29-4.25 (m, 1H), 4.13-4.09 (m, 1H), 3.91-3.80 (m, 3H), 3.77-3.74 (m, 1H), 3.70 (s, 3H), 3.18 (d, J=5.0 Hz, 1H), 3.06-3.01 (m, 1H), 2.98-2.90 (m, 2H), 2.83 (m, 2H), 2.77-2.70 (m, 2H), 2.47 (m, 1H), 2.06-2.01 (m, 2H), 1.97-1.93 (m, 1H), 1.88-1.87 (m, 2H), 0.91-0.89 (m, 6H).

1. customThe mixture was evaporated under reduced pressure
2. extractionthe residue was extracted with ethyl acetate (2×20 mL)
3. extractionThe combined ethyl acetate extract
4. concentrationwas concentrated under reduced pressure
5. customthe residue was purified by prep-HPLC