反应详情

N-(3,5-Dimethoxyphenyl)acetamide (500 mg, 2.56 mmol) was suspended in CCl4 (3 mL) followed by the addition of NBS (456 mg, 2.56 mmol) at room temperature. The reaction mixture was stirred at room temperature for 0.5 hour, heated at 80° C. for 2 hours and then concentrated under reduced pressure. The crude material was purified by silica gel chromatography (80 g ISCO column, eluting with 0% to 20% EtOAc in CH2Cl2) to provide Intermediate 9A (178 mg, 0.649 mmol, 25.4% yield) as a white solid. MS (ES): m/z=276.0 [M+H]+. 1H NMR (400 MHz, MeOD) δ ppm 2.14 (s, 3 H) 3.85 (s, 6 H) 7.01 (s, 2 H).

1. temperatureheated at 80° C. for 2 hours
2. concentrationconcentrated under reduced pressure
3. customThe crude material was purified by silica gel chromatography (80 g ISCO column, eluting with 0% to 20% EtOAc in CH2Cl2)