反应详情

4-(4-Nitrophenyl)piperidine (5 g, 24 mmol) was dissolved in MeOH (240 mL). To the solution were added cyclopentanone (6.5 mL, 73 mmol) and acetic acid (3 mL). The mixture was stirred for 1 hour, and then NaBH3CN (6.1 g, 97 mmol) was added. The mixture was stirred at room temperature for 12 hours. The solvent was removed under reduced pressure, and the residue was suspended in EtOAc. The organic suspension was washed with 1N NaOH (aq), water and brine, dried, concentrated and purified by flash column chromatography (MeOH/DCM) to obtain 1-cyclopentyl-4-(4-nitrophenyl)piperidine (303) (6.5 g, 24 mmol, 100% yield).

1. stirringThe mixture was stirred at room temperature for 12 hours
2. customThe solvent was removed under reduced pressure
3. washThe organic suspension was washed with 1N NaOH (aq), water and brine
4. customdried
5. concentrationconcentrated
6. custompurified by flash column chromatography (MeOH/DCM)