反应详情

To a solution of tert-butyl 4-((4-formylpiperidin-1-yl)methyl)benzoate (6.7 g, 22.08 mmol) in methanol (50 mL) was added (1R,2S)-2-phenylcyclopropanamine (3.53 g, 26.5 mmol). The reaction mixture was refluxed for 5 minutes then cooled down to the room temperature. Sodium cyanotrihydroborate (2.082 g, 33.1 mmol) was added. The reaction mixture was stirred 1 hour at room temperature. Water (50 mL) was added. The reaction was concentrated and 50 mL of dichloromethane was added. The layers were separated. The organics were washed with 10% acetic acid (50 mL). The layers were separated and 50 mL of brine was added slowly as a solid crashed out. The solid was filtered and suspended in isopropanol. The suspension was sonicated and filtered. tert-Butyl 4-((4-((((1R,2S)-2-phenylcyclopropyl)amino)methyl)piperidin-1-yl)methyl)benzoate (5.8 g, 13.65 mmol, 61.8% yield) was isolated as a white solid. 1H NMR (400 MHz, METHANOL-d4) δ 8.07 (d, J=8.34 Hz, 2H), 7.70 (d, J=8.08 Hz, 2H), 7.28-7.37 (m, 2H), 7.10-7.28 (m, 3H), 4.43 (br. s., 2H), 3.54 (d, J=10.86 Hz, 2H), 3.08-3.26 (m, 4H), 3.03 (dt, J=3.76, 7.39 Hz, 1H), 2.54-2.71 (m, 1H), 2.03-2.29 (m, 3H), 1.67-1.84 (m, 2H), 1.58-1.67 (m, 10H), 1.40 (q, J=6.82 Hz, 1H); LC-MS Rt=0.76 min; MS (ESI): 421.4 [M+H]+.

1. temperatureThe reaction mixture was refluxed for 5 minutes
2. concentrationThe reaction was concentrated
3. addition50 mL of dichloromethane was added
4. customThe layers were separated
5. washThe organics were washed with 10% acetic acid (50 mL)
6. customThe layers were separated
7. addition50 mL of brine was added slowly as a solid
8. filtrationThe solid was filtered
9. customThe suspension was sonicated
10. filtrationfiltered