A solution of 4-((4-(aminomethyl)phenyl)methyl)-1-phenylpiperazine (0.62 g), propionyl chloride (0.23 ml) and triethylamine (0.37 ml) in methylene chloride (20 ml) was stirred at room temperature for 4 hr. To this reaction mixture was added chloroform (100 ml), and the mixture was washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated to give a pale-brown solid (0.9 g). The obtained solid was crystallized from ethyl acetate (50 ml) to give the title compound (0.5 g) as pale-yellow white crystals, m.p.=140-141° C.
