反应详情

A mixture of 1.2 g of the ethylene ketal of 4-(3-pyridinecarbonylamino)-1-piperidinecarboxylate and 20 mL of 6N HCl was heated under reflux for 6 h. The mixture was cooled, extracted with 20 mL of dichloromethane, then basified with 6N NaOH and extracted with 3×50 mL of chloroform. The combined chloroform extracts were dried over MgSO4 and concentrated under reduced pressure. Drying under vacuum gave 0.6 g of 4-(3-pyridinecarbonylamino)piperidine as an oil: 1H NMR (400 MHz, CDCl3) 8.96 (d, J=2 Hz, 1H), 8.72 (m, 1H), 8.10 (m, 1H), 7.40 (m, 2H).

1. temperaturewas heated
2. temperatureunder reflux for 6 h
3. temperatureThe mixture was cooled
4. extractionextracted with 20 mL of dichloromethane
5. extractionextracted with 3×50 mL of chloroform
6. dry with materialThe combined chloroform extracts were dried over MgSO4
7. concentrationconcentrated under reduced pressure
8. customDrying under vacuum