Binap, (A+-)- → 3(S)-(3-chloro-4-fluorophenylamino)pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 660104Notes

Reaction equation

HRID 660104 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@H:10]([NH2:13])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].Br[C:15]1[CH:20]=[CH:19][C:18]([F:21])=[C:17]([Cl:22])[CH:16]=1.C1C=CC(P(C2C(C3C(P(C4C=CC=CC=4)C4C=CC=CC=4)=CC=C4C=3C=CC=C4)=C3C(C=CC=C3)=CC=2)C2C=CC=CC=2)=CC=1.CC(C)([O-])C.[Na+]>C([O-])(=O)C.[Pd+2].C([O-])(=O)C.C(OCC)(=O)C.O.C1(C)C=CC=CC=1>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@H:10]([NH:13][C:15]2[CH:20]=[CH:19][C:18]([F:21])=[C:17]([Cl:22])[CH:16]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

9

Reactant 4

HCID 634876Binap, (A+-)-HCID 854071tert-butyl (3S)-3-aminopyrrolidine-1-carboxylateHCID 35430654-Bromo-2-chloro-1-fluorobenzeneHCID 23676156Sodium t-butoxide

Product 1

HCID 666570713(S)-(3-chloro-4-fluorophenylamino)pyrrolidine-1-carboxylic acid tert-butyl esterYield 56%

Reagents, catalysts & solvents 4

HCID 167845palladium(II) acetateCatalystHCID 962WaterSolventHCID 1140TolueneSolventHCID 8857Ethyl AcetateSolvent

Procedure

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.

Workup

  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

Sources & evidence

ORD record
ord-1f41be125efd41428a5ef92748c31669
Source dataset
uspto-grants-2011_12
Patent number
US08084442B2

Reaction notes

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