反应详情

To a 50 ml of toluene solution containing 5.0 g of 3(S)-aminopyrrolidine-1-carboxylic acid tert-butyl ester (27 mmol) and 5.7 g of 4-bromo-2-chloro-1-fluorobenzene (27 mmol) were added 1.7 g of BINAP (2.7 mmol), 0.30 g of palladium acetate (1.3 mmol) and 3.5 g of sodium tert-butoxide (36 mmol). The mixture was heated under reflux under a nitrogen atmosphere for 8 hours, and then cooled to room temperature. Water was added to the reaction solution, and extraction with ethyl acetate was performed. After drying over sodium sulfate and concentration under reduced pressure, the residue was purified by silica gel column chromatography (n-hexane:ethyl acetate 4:1). The solvent was distilled off under reduced pressure, and the residue was recrystallized from diethyl ether to thereby obtain 4.76 g of white powdery 3(S)-(3-chloro-4-fluorophenylamino)pyrrolidine-1-carboxylic acid tert-butyl ester.

1. temperatureThe mixture was heated
2. temperatureunder reflux under a nitrogen atmosphere for 8 hours
3. dry with materialAfter drying over sodium sulfate and concentration under reduced pressure
4. customthe residue was purified by silica gel column chromatography (n-hexane:ethyl acetate 4:1)
5. distillationThe solvent was distilled off under reduced pressure
6. customthe residue was recrystallized from diethyl ether