反应详情

A mixture of 176a (200 mg, 0.31 mmol), NaBH4 (47 mg, 1.20), and methanol (10 mL) was stirred at room temperature for 1 h. The reaction mixture was then quenched with water (10 mL) and concentrated under reduced pressure. The residue was extracted with dichloromethane (2×10 mL). The combined dichloromethane extract was concentrated under reduced pressure and the residue was purified with reverse-phase prep-HPLC to afford 176 (42 mg, 28%). MS-ESI: [M+H]+ 649.3. 1H NMR (500 MHz, DMSO-d6) δ 8.66 (d, J=2.5 Hz, 1H), 8.56 (d, J=5.5 Hz, 1H), 8.47 (s, 1H), 7.84 (d, J=2.5 Hz, 1H), 7.50-7.48 (m, 2H), 7.39-7.36 (m, 1H), 7.26-7.24 (m, 2H), 6.83-6.80 (m, 2H), 4.57-4.54 (m, 2H), 4.48-4.40 (m, 3H), 4.35-4.33 (m, 1H), 3.69-3.67 (m, 1H), 3.60 (s, 3H), 3.41-3.38 (m, 2H), 3.11-3.08 (m, 1H), 2.97-2.93 (m, 1H), 2.76-2.74 (m, 2H), 2.62-2.60 (m, 2H), 2.52-2.51 (m, 1H), 2.35-2.32 (m, 2H), 2.19-2.17 (m, 1H), 1.90-1.87 (m, 2H), 1.77-1.75 (m, 2H), 0.94 (d, J=6.5 Hz, 3H).

1. customThe reaction mixture was then quenched with water (10 mL)
2. concentrationconcentrated under reduced pressure
3. extractionThe residue was extracted with dichloromethane (2×10 mL)
4. extractionThe combined dichloromethane extract
5. concentrationwas concentrated under reduced pressure
6. customthe residue was purified with reverse-phase prep-HPLC