反应详情

Intermediate 32 (1 g, 2.56 mmol) dissolved in toluene (10 ml) and added P2S5 (0.57 g, 2.56 mmol). This mixture was refluxed for 18 h. Toluene removed on rotavapour to obtain the crude. Crude was purified by column chromatography on 60-120 mesh silicagel using EtOAc and Petether (20:80) as eluent to afford the title compound (500 mg) as a yellow solid. 1H-NMR (δ ppm, DMSO-d6, 400 MHz): 11.02 (s, 1H), 7.92-7.85 (m, 2H), 7.69 (dd, J 1.6, 8.1, 1H), 7.63 (dd, J 1.6, 9, 1H), 7.33-7.27 (m, 2H), 3.02 (s, 3H).

1. temperatureThis mixture was refluxed for 18 h
2. customToluene removed on rotavapour
3. customto obtain the crude
4. customCrude was purified by column chromatography on 60-120 mesh silicagel