[N:1]1([NH:7][C:8](=O)OC(C)(C)C)[CH2:6][CH2:5][NH:4][CH2:3][CH2:2]1.FC(F)(F)C(O)=O.[F:22][C:23]([F:33])([F:32])[C:24]1[CH:31]=[CH:30][C:27](C=O)=[CH:26][CH:25]=1.C(=O)([O-])O.[Na+]>C(Cl)Cl>[N:1]1([N:7]=[CH:8][C:27]2[CH:30]=[CH:31][C:24]([C:23]([F:33])([F:32])[F:22])=[CH:25][CH:26]=2)[CH2:2][CH2:3][NH:4][CH2:5][CH2:6]1
Tert-butyl piperazin-1-yl-carbamate (403 mg, 2.0 mmol) was suspended in methylene chloride (4 ml), to which trifluoroacetic acid (1.6 ml) was added, and the mixture was stirred at room temperature for 5 minutes. To which 4-(trifluoromethyl)benzaldehyde (0.3 ml, 2.2 mmol) was added, and the resulting mixture was stirred at room temperature for 1 hour. The reaction mixture was poured into sodium hydrogencarbonate aqueous solution, and extracted with ethyl acetate. The extract was washed with brine, dried over sodium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (methylene chloride/methanol=9/1) to afford piperazin-1-yl-(4-trifluoromethylbenzylidene)-amine (432 mg, yield 84%) as a colorless crystalline powder.
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