反应详情

A solution of 4-benzyloxycarbonyl-1-[1-(4-pyridyl)-4-piperidinylamino]-2-piperazinone (25.29 g) and an a 4N solution of hydrochloric acid in ethyl acetate (15.5 ml) in methanol (300 ml) was combined with 10% Pd/C (50% hydrated, 5.00 g) and stirred at room temperature for 15 hours under a hydrogen atmosphere. The catalyst was filtered off, and the reaction mixture was concentrated. The residue was dissolved in ethanol (300 ml), and combined with a 4N solution of hydrochloric acid in ethyl acetate (31 ml). The crystals precipitated were collected by filtration and dried to obtain 1-[1-(4-pyridyl)-4-piperidinylamino]-2-piperazinone trihydrochloride (20.16 g) as colorless crystals.

1. filtrationThe catalyst was filtered off
2. concentrationthe reaction mixture was concentrated
3. dissolutionThe residue was dissolved in ethanol (300 ml)
4. customThe crystals precipitated
5. filtrationwere collected by filtration
6. customdried