[N+:1]([C:4]1[CH:9]=[CH:8][C:7]([N:10]2[CH2:15][CH2:14][C:13](=O)[CH2:12][CH2:11]2)=[CH:6][CH:5]=1)([O-:3])=[O:2].[CH3:17][N:18]1[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1.CC(O)=O.[BH3-]C#N.[Na+]>CO>[CH3:17][N:18]1[CH2:23][CH2:22][N:21]([CH:13]2[CH2:14][CH2:15][N:10]([C:7]3[CH:8]=[CH:9][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=3)[CH2:11][CH2:12]2)[CH2:20][CH2:19]1A mixture of 1-(4-Nitro-phenyl)-piperidin-4-one (84 mg, 0.38 mmol) and 1-methylpiperazine (0.085 mL, 0.76 mmol) in MeOH (2 mL) is stirred at room temperature for 5 hours. Then to the reaction mixture is added 0.2 mL of HOAc, followed by NaCNBH3 (72 mg, 1.14 mmol). The mixture is stirred at room temperature for 0.5 hour, then concentrated. The residue is taken up in EtOAc, washed with saturated NaHCO3 aqueous solution and brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The crude product is purified by column chromatography (SiO2, 2N NH3 in MeOH:CH2Cl2=1:99 to 10:90) to give 46 mg of the title compound as a yellow solid.
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