3-[(4-Methylpiperazin-1-yl)methyl]benzonitrile

109-01-3

24964-64-5

859850-90-1

General procedure for the synthesis of 3-((4-methylpiperazin-1-yl)methyl)benzonitrile from N-methylpiperazine and 3-cyanobenzaldehyde: Step 1: 3-Formylbenzonitrile (1.5 g, 11.45 mmol), N-methylpiperazine (1.49 g, 14.9 mmol) and sodium triacetoxyborohydride (3.63 g, 17.18 mmol) were dissolved in dichloromethane (75 ml), acetic acid (0.851 ml, 14.9 mmol) was added and the reaction was stirred at room temperature overnight. After completion of the reaction, the reaction mixture was diluted with dichloromethane and washed with 1 M sodium carbonate solution. The organic phase was dried with anhydrous sodium sulfate and concentrated under reduced pressure. The crude product was purified by column chromatography (eluent: dichloromethane/methanol/ammonia = 97:3:0.5) to give 3-(4-methylpiperazin-1-ylmethyl)benzonitrile 1.7 g in 70% yield.