C1C=CC=CC=1.[NH2:7][C:8]1[CH:13]=[C:12]([O:14][CH2:15][CH3:16])[CH:11]=[CH:10][C:9]=1[CH3:17].[CH:18](=O)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C([BH3-])#N.[Na+]>O>[CH2:18]([NH:7][C:8]1[CH:13]=[C:12]([O:14][CH2:15][CH3:16])[CH:11]=[CH:10][C:9]=1[CH3:17])[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1100 ml of benzene was added to 20.8 g (138 mmol) of 2-amino-4-ethoxytoluene and 17.8 g (168 mmol) of benzaldehyde, and the mixture was heated with refluxing for 5 hours in a reaction vessel equipped with a water separator. After cooling, the reaction solution was concentrated under reduced pressure. 640 ml of methanol was added to the residue, followed by the addition of acetic acid to adjust pH to 5. To this was added 13.1 g (208 mmol) of sodium cyanoborohydride while stirring under cooling with ice, and the mixture was stirred overnight at room temperature. The reaction mixture was concentrated, purified by column chromatography (silica gel, chloroform), and recrystallized (chloroform-n-hexane) to obtain 19.7 g (yield, 59.2%) of colorless prisms of the title compound.
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