[NH2:1][CH:2]([C:4]1[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[C:6]([O:12][CH3:13])[CH:5]=1)[CH3:3].[CH:14](=O)[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.[BH4-].[Na+]>N1C=CC=CC=1.CO>[CH3:13][O:12][C:6]1[CH:5]=[C:4]([CH:2]([CH3:3])[NH:1][CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[CH:9]=[CH:8][C:7]=1[O:10][CH3:11]A mixture containing 18.1 g of 1-amino-1-(3,4-dimethoxyphenyl)-ethane (J. Chem. Soc. 1963, 4289), 10,6 g of benzaldehyde and 1 drop of pyridine in 100 ml of methanol is let stand at 20° C. for 2 days, then 3.8 g of sodium borohydride are added during 30 minutes and stirred for additional 3 hours. After evaporation of the solvent, the residue is diluted with water, extracted with chloroform, the organic phase is dried and evaporated to give 27.1 g of the crude title compound, which can directly be used in the process described in Example 6.
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