Benzaldehyde → N-(1H-benzimidazol-2-ylmethyl)-N-[[4-[(benzylamino)methyl]phenyl]methyl]-5,6,7,8-tetrahydroquinolin-8-amine

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Benzaldehyde (0.5 mL, 4.92 mmol) was condensed with N′-(1H-benzimidazol-2-ylmethyl)-N′-(5,6,7,8-tetrahydro-8-quinolinyl)-1,4-benzenedimethanamine (170 mg, 0.428 mmol) in dry MeOH (3 mL) for 17 h at room temperature and the resultant imine was reduced with sodium borohydride (329 mg, 8.70 mmol) for 1 h (see General Procedures A and B). Purification of the crude product by flash chromatography (14 g silica, 30:1:1 EtOAc/CH3OH/NH4OH) followed by radial chromatography (2 mm TLC plate, 100:1:1 CH2Cl2/CH3OH/NH4OH) gave the N-alkylated product (54 mg, 26%) as a foam.

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