反应详情

5-Bromo-2,3,4-trifluoro-benzaldehyde (10 g, 41.8 mmol) was dissolved in dry acetonitrile (70 mL). Triethylamine (6.4 mL, 46.0 mmol) was added, followed by trans-2,6-dimethylmorpholine (BASF, 5.3 g, 46 mmol). The mixture was refluxed for 24 hours, then cooled to room temperature, and treated with 1N HCl (58 mL). The acetonitrile was removed by rotoevaporation and the resulting solids were filtered, washed with water then dissolved in THF (100 mL). The solution was dried over MgSO4 and concentrated to a yellow oil. Hexanes were added and the mixture was re-concentrated to give 12.66 g of a yellow powder. 1H NMR (400 MHz, CHLOROFORM-d) d ppm 1.26 (d, J=6.4 Hz, 6H), 2.92 (m, 2H), 3.28 (d, J=11.7 Hz, 2H), 4.15 (m, 2H), 7.78 (dd, J=7.2, 2.3 Hz, 2H), 10.32 (s, 4H).

1. temperatureThe mixture was refluxed for 24 hours
2. customThe acetonitrile was removed by rotoevaporation
3. filtrationthe resulting solids were filtered
4. washwashed with water
5. dissolutionthen dissolved in THF (100 mL)
6. dry with materialThe solution was dried over MgSO4
7. concentrationconcentrated to a yellow oil
8. additionHexanes were added
9. concentrationthe mixture was re-concentrated