反应详情

To a solution of the title compound from Step B (1.39 g 8.79 mmol) in chloroform (50 ml) was added NBS (1.56 g, 8.79 mmol) and benzoyl peroxide (213 mg, 0.88 mmol) and the resulting mixture heated at reflux for 5 h. The mixture cooled and evaporated, the residue purified by MPLC (Biotage Horizon: FLASH 25+M) eluent: 100% Hexanes (90 ml), gradient rising from 100% Hexanes to 10% EtOAc in Hexanes (1200 ml) to afford the title compound 240 mg (11.5%) as a red oil. 1H NMR (CDCl3): 2.25 (d, J 6.9 Hz, 3H), 5.51 (q, J 6.9 Hz, 1H), 7.64 (m, 1H), 7.71 (m, 1H), 7.97 (m, 1H), 8.08 (d, J 8.6 Hz, 1H), 9.49 (s, 1H).

1. temperaturethe resulting mixture heated
2. temperatureat reflux for 5 h
3. temperatureThe mixture cooled
4. customevaporated
5. customthe residue purified by MPLC (Biotage Horizon: FLASH 25+M) eluent