反应详情

300 mg (0.54 mmol) of ethyl 1-[(R)-2-tert-butoxycarbonylamino-3-(3,4-dichloro-phenyl)propionyl]-4-cyclohexylpiperidine-4-carboxylate are diluted in 5 mL of a 2/1 dichloromethane/trifluoroacetic acid solution. After 2 hours, the mixture is poured into aqueous 1N sodium hydroxide solution and then extracted with dichloromethane. The organic phase is dried over sodium sulfate and then filtered and concentrated to dryness. 210 mg of ethyl 1-[(R)-2-amino-3-(3,4-dichlorophenyl)propionyl]-4-cyclo-hexylpiperidine-4-carboxylate are obtained in a yield of 86%.

1. extractionextracted with dichloromethane
2. dry with materialThe organic phase is dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated to dryness