[NH2:1][CH2:2][CH:3]1[O:8][CH2:7][CH2:6][N:5]([CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH2:4]1.N1C=CC=CC=1.[C:22](OC(=O)C)(=[O:24])[CH3:23].C(=O)([O-])O.[Na+].[OH-].[Na+]>C1(C)C=CC=CC=1>[C:22]([NH:1][CH2:2][CH:3]1[O:8][CH2:7][CH2:6][N:5]([CH2:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[CH2:4]1)(=[O:24])[CH3:23]To a solution of crude 2-aminomethyl-4-benzylmorpholine (48 g) in toluene (400 ml) was added pyridine (24.5 ml, 0.303 mol) and then acetic anhydride (26.4 ml, 0.280 mol) was added dropwise under ice-cooling over 10 minutes and then allowed to rise to room temperature and the mixture was stirred for one hour. To the reaction mixture was added aqueous saturated sodium hydrogen carbonate (200 ml) under ice-cooling and then 10% aqueous sodium hydroxide was added until the mixture became strongly basic. The reaction mixture was extracted with ethyl acetate (200 ml×3) and the combined organic layer was washed with aqueous saturated sodium chloride (200 ml). The organic layer was dried over potassium carbonate and the solvent was distilled off under reduced pressure. The residue was recrystallized from ethyl acetate-hexane (1/1) to give 2-(N-acetylaminomethyl)-4-benzylmorpholine (25.93 g). A total yield of 3 steps=56%.
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