反应详情

To a solution of Example 112A (1.30 g, 4.23 mmol) in acetic acid (20 mL) was added N-bromosuccinimide (0.828, 4.65 mmol). The reaction stirred for 16 hours. The reaction solution was concentrated, then partitioned between NaOH (1M) and dichloromethane. The dichloromethane layer was separated and concentrated onto silica gel. Purification via flash chromatography (30-100% ethyl acetate/hexanes) afforded the title compound. 1H NMR (300 MHz, DMSO-d6) δ ppm 7.22-7.38 (m, 6H) 7.07 (d, J=2.37 Hz, 1H), 7.01 (d, J=8.81 Hz, 1H), 3.50-3.58 (m, 2H), 3.24-3.30 (m, 1H), 3.05-3.17 (m, 1H), 2.91-3.01 (m, 1H), 2.71-2.86 (m, 2H), 2.52-2.61 (m, 1H), 2.05-2.25 (m, 2H), 1.90 (d, J=13.22 Hz, 1H); MS (APCI+) m/z 386, 388 (M+H)+.

1. concentrationThe reaction solution was concentrated
2. custompartitioned between NaOH (1M) and dichloromethane
3. customThe dichloromethane layer was separated
4. concentrationconcentrated onto silica gel
5. customPurification via flash chromatography (30-100% ethyl acetate/hexanes)