反应详情

To the phenol from example 29 (200 mg 0.9 mmol) in dichloromethane (5 ml) was added N-bromosuccinimide (161 mg, 0.9 mmol). The reaction mixture was stirred at room temperature for 55 hours, before concentrating in vacuo. The crude product was purified by column chromatography on silica eluting with dichloromethane, methanol (95:5) to give the title compound as a white foam (117.5 mg, 0.35 mmol, 44%). 1H NMR (CDCl3, 400 MHz) δ: 0.96 (t, 3H), 1.59 (q, 2H), 2.03 (t, 1H), 2.23 (t, 1H), 2.40 (t, 2H), 2.81 (d, 1H), 2.98 (d, 1H), 3.82 (t, 1H), 4.01 (d, 1H), 4.56 (d, 1H), 6.96 (d, 1H), 7.20 (d, 1H), 7.49 (s, 1H). LRMS: m/z 302 (M-H+, Br isotope).

1. concentrationbefore concentrating in vacuo
2. customThe crude product was purified by column chromatography on silica eluting with dichloromethane, methanol (95:5)