[C:1]([C:5]1[CH:12]=[CH:11][C:8]([CH:9]=O)=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].[CH2:13]([O:15][C:16]1[CH:17]=[C:18]([CH:22]=[CH:23][CH:24]=1)[CH2:19][CH2:20][NH2:21])[CH3:14].[BH4-].[Na+].Cl>CO>[C:1]([C:5]1[CH:12]=[CH:11][C:8]([CH2:9][NH:21][CH2:20][CH2:19][C:18]2[CH:22]=[CH:23][CH:24]=[C:16]([O:15][CH2:13][CH3:14])[CH:17]=2)=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2]0.38 ml of 4-tert-butylbenzaldehyde (2.25 mmol) and 0.245 ml of 3-ethoxyphenethyl-amine (1.5 mmol) were dissolved in 5 ml methanol at rt, and after stirring for 30 min at rt, were refluxed for 2 h. After cooling down to rt, 85 mg (2.25 mmol) of sodium borohydride were added and after 10 min stirring at rt, the reaction mixture was then refluxed for 3 h. After cooling down to rt, the reaction mixture was treated with 0.15 ml 1 N HCl and concentrated in vacuo. The residue was diluted with water/EtOAc. After separation of the organic phase, the aqueous phase was extracted with EtOAc and the combined organic phases were washed with brine, dried with magnesium sulfate, filtered off and concentrated in vacuo. The residue, 461 mg of a light yellow oil, was not further purified and used directly in the next step.
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