反应详情

1,3,5-Trifluoro-2-nitro-benzene (5.30 g, 29.9 mmol) and K2CO3 (4.96 g, 35.9 mmol) were mixed in DMSO (40.0 mL, 564 mmol) and morpholine (2.74 mL, 31.4 mmol) was added. The reaction was stirred at rt for 48 h, diluted with EtOAc and washed twice with water. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. Title compound isolated as a yellow oil (4.26 g, 58%). LCMS (m/e) 245 (M+H); 1H-NMR (CDCl3, 400 MHz) δ 6.67-6.58 (m, 2H), 3.80 (t, 4H, J=4.2 Hz), 3.06 (t, 4H, J=4.2 Hz), 19F-NMR (CDCl3, 400 MHz) δ −102, −118. Also obtained in this reaction, 4-(3,5-difluoro-4-nitro-phenyl)-morpholine as a yellow solid (2.85 g, 39%). m.p.=112-114° C.; LCMS (m/e) 245 (M+H); 1H-NMR (CDCl3, 400 MHz) δ 6.45-6.37 (m, 2H), 3.86 (t, 4H, J=4.5 Hz), 3.33 (t, 4H, J=4.5 Hz); 19F-NMR (CDCl3, 400 MHz) δ −115.

1. washwashed twice with water
2. dry with materialThe organic layer was dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure