1-(4-Nitrophenyl)piperazine → N,N-Dimethyl-4-(4-nitrophenyl)-1-piperazinepropanamine

Participants

Reaction Conditions

Reaction Steps

Prepared according to a slightly modified procedure from U.S. Pat. No. 3,331,845. A mixture of 4-nitrophenylpiperazine (2.1 g, 10 mmol), sodium hydrogen carbonate (2.5 g, 30 mmol), N,N-dimethyl-N-(3-chloropropyl)amine hydrochloride (1.9 g, 12 mmol) in isopropanol (80 mL) was heated at 80° C. for 18 h. The mixture was then allowed to cool, the solid filtered off and the solvent removed under reduced pressure. Ethyl acetate (ca. 200 mL) was added and the residue was washed with saturated brine twice (50 mL each time). The organic layer was dried over sodium sulphate and the solvent evaporated under reduced pressure. The crude compound was purified by column, eluting with dichloromethane/methanol 9/1 (containing 1% N,N-dimethylethylamine) to give the title compound as a yellow solid. 1H NMR (CDCl3, 400 MHz): 1.6 (2H, m); 2.15 (6H, s); 2.25 (2H, m); 2.35 (2H, m); 2.5-2.55 (4H, m); 3.35-3.4 (4H, m); 6.75 (2H, d, J 8 Hz); 8.05 (2H, d, J 8 Hz) MS: 293, 248.

Provenance & Evidence