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温度

0 °C

Grignard's reagent was prepared by reaction of magnesium (932 mg, 5.93 mmol) with bromobenzene (144 mg, 5.93 mmol) in diethyl ether (20 ml) at room temperature for 10 min. After cooling to 0° C., a solution of 2-cyano-4-benzyl-morpholine (1.00 g, 4.94 mmol) in diethyl ether (2.0 ml) was added and then tetrahydrofuran (6.0 ml) was added. The mixture was stirred at room temperature for 30 min. After decomposition with saturated aqueous sodium hydrogen carbonate, the mixture was filtered and concentrated under reduced pressure. The crude product was purified by flash chromatography on silica gel (n-hexane-ethyl acetate 3:1 to 2:1) to give the 2-benzoyl-4-benzylmorpholine (608 mg, 44%).

1. filtrationAfter decomposition with saturated aqueous sodium hydrogen carbonate, the mixture was filtered
2. concentrationconcentrated under reduced pressure
3. customThe crude product was purified by flash chromatography on silica gel (n-hexane-ethyl acetate 3:1 to 2:1)