反应详情

To a solution of 3-amino-1-(3-bromophenyl)propan-1-ol (146) (2.30 g, 10 mmol) in anhydrous THF (20 mL) was added ethyl trifluoroacetate (4.0 mL, 33.5 mmol). The reaction mixture was stirred at room temperature for 3 h, then concentrated under reduced pressure. Purification by column chromatography (10 to 70% EtOAc-hexanes gradient) gave N-(3-(3-bromophenyl)-3-hydroxypropyl)-2,2,2-trifluoroacetamide (147) as an oil containing ˜15% of 2,2,2-trifluoro-N-(3-hydroxy-3-phenylpropyl)acetamide. Yield (1.96 g, 60%): 1H NMR (400 MHz, DMSO-d6) δ 9.33 (s, 1H), 7.51 (t, J=2.0 Hz, 1H), 7.41 (dt, J=7.6, 2.0 Hz, 1H), 7.25-7.32 (m, 2H), 5.46 (d, J=6.4 Hz, 1H), 4.55-4.60 (m, 1H), 3.20-3.23 (m, 2H), 1.75-1.82 (m, 2H).

1. concentrationconcentrated under reduced pressure
2. customPurification by column chromatography (10 to 70% EtOAc-hexanes gradient)