[CH3:1][Si:2]([CH3:12])([CH3:11])[C:3]1[CH:10]=[CH:9][C:6]([CH:7]=O)=[CH:5][CH:4]=1.[Cl:13][C:14]1[CH:15]=[C:16]([CH2:21][CH2:22][NH2:23])[CH:17]=[CH:18][C:19]=1[Cl:20].[BH4-].[Na+].O>CO>[Cl:13][C:14]1[CH:15]=[C:16]([CH2:21][CH2:22][NH:23][CH2:7][C:6]2[CH:9]=[CH:10][C:3]([Si:2]([CH3:12])([CH3:11])[CH3:1])=[CH:4][CH:5]=2)[CH:17]=[CH:18][C:19]=1[Cl:20]4-Trimethylsilanyl-benzaldehyde (800 mg, 4.5 mmol) and 2-(3,4-dichloro-phenyl)-ethylamine (1023 mg, 5.4 mmol) were dissolved in methanol (5 ml) and the solution was stirred at rt for 5 min. Sodium borohydride (166 mg, 4.5 mmol) was added under nitrogen and the reaction mixture was stirred at rt for 1 h. Water was added and methanol was evaporated in vacuo. The reaction was extracted twice with diethyl ether and the combined organic layers were washed once with water and once with sat. aq. NaCl solution, dried with sodium sulfate, filtered and concentrated in vacuo to yield [2-(3,4-dichloro-phenyl)-ethyl]-(4-trimethylsilanyl-benzyl)-amine (1640 mg, 100%) as a colorless oil. MS (ISP): 352.2/354.2 (100/74) (M+H)+. 1HNMR (CDCl3, 300 MHz): δ 7.48 (d, 2H), 7.25-7.35 (m, 4H), 7.02 (dd, 2H), 3.79 (s, 2H), 2.75-3.00 (m, 4H), 0.26 (s, 9H).
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