Benzaldehyde → 4-Aminomethyl-1-N-Cbz-piperidine

Temperature

0 °C

22.2 g(0.2 mol) of 4-aminomethyl-piperidine was dissolved in 250 ml of toluene and then 21.2 g(0.2 mol) of benzaldehyde was added thereto. The mixture was refluxed for 3 hours with Dean-stack and cooled down to 0° C., and then 34.2 g(0.2 mol) of benzylchloroformate was added thereto while stirring. After the mixture was stirred for 3 hours, 1N aqueous potassium hydrosulfate solution(220 ml) was added thereto at room temperature. The mixture was extracted three times with 200 ml of diethylether, and then the aqueous layer was basified with sodium hydroxide. The aqueous solution was saturated with sodium chloride and extracted three times with 100 ml of dichloromethane. The organic solution was dried over magnesium sulfate and distilled under reduced pressure to obtain 38 g(Yield 91%, Molecular weight 248) of the title compound

1. temperatureThe mixture was refluxed for 3 hours with Dean-stack
2. stirringAfter the mixture was stirred for 3 hours
3. customat room temperature
4. extractionThe mixture was extracted three times with 200 ml of diethylether
5. extractionextracted three times with 100 ml of dichloromethane
6. dry with materialThe organic solution was dried over magnesium sulfate
7. distillationdistilled under reduced pressure

ORD record

ord-e7830c2010ac4d12934b885c28d36a91

Source dataset

uspto-grants-2001_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06268363B1