[CH:1]([C:3]1[CH:4]=[C:5]([CH:8]=[CH:9][CH:10]=1)[CH:6]=O)=[CH2:2].[NH:11]1[CH2:16][CH2:15][O:14][CH2:13][CH2:12]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+].C(O)(=O)C>ClCCl>[CH:1]([C:3]1[CH:4]=[C:5]([CH:8]=[CH:9][CH:10]=1)[CH2:6][N:11]1[CH2:16][CH2:15][O:14][CH2:13][CH2:12]1)=[CH2:2]To the solution of 3-vinyl benzaldehyde (5 g, 38 mmol) and morpholine (3.0 mL, 52 mmol) in dichloromethane (126 ml) was added sodium triacetoxyborohydride (19.2 g, 92 mmol) in portion at 0° C. followed by acetic acid (2.3 mL, 40 mmol). After the addition, reaction mixture was raised to room temperature and stirred at room temperature overnight. The reaction mixture was diluted with dichloromethane washed with 1N NaOH and extracted with dichloromethane 3 times. The combined organic layer was dried over magnesium sulfate and concentrated under vacuum to give the title compound as pale yellow oil (7.2 g, 93% yield)
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