1-(2-Pyridyl)piperazine → 5,6-Dihydro-3-(4-(pyridm-2-yl)piperazin-1-yl)benzo[h]cinnoline

Participants

Reaction Conditions

Reaction Steps

A mixture of comprising about 0.01 mol of 3-chloro-5,6-dihydrobenzo[h]cinnoline, about 0.05 mol of 1-(pyridin-2-yl)piperazine and about 0.01 mol of ammonium hydrochloride was prepared in about 15 ml of 1-BuOH. The mixture was stirred at 130° C. for 48 h, and then the solvent was removed under reduced pressure. The remaining residue was then extracted with ethyl acetate, washed with water and brine, dried over anhydrous Na2SO4. Removal of solvent followed by recrystallization from 95% ethanol yielded light yellow crystals, yield 81.1%; HPLC: 96.4% purity; HRMS calculated 343.1791, found 343.1787; 1H NMR (CDCl3): 5 8.452 (d, J=7.5, 1H), 8.232 (s, 1H), 7.211-7.534 (m, 4H), 6.794 (s, 1H), 6.678-6.731 (m, 2H), 3.862 (d, J=4.0, 4H), 3.745 (d, J=4.0, 4H), 2.918 (s, 4H).

Provenance & Evidence