Dimethyl Sulfate → (2S)-2-[(tert-Butoxycarbonyl)amino]-3-(3,5-difluorophenyl)propionic acid methyl ester

HRID 23219Notes

Reaction equation

HRID 23219 reaction equation
[C:1]([O:5][C:6]([NH:8][C@@H:9]([CH2:13][C:14]1[CH:19]=[C:18]([F:20])[CH:17]=[C:16]([F:21])[CH:15]=1)[C:10]([OH:12])=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].[C:22](=O)([O-])[O-].[K+].[K+].S(OC)(OC)(=O)=O.[OH-].[NH4+]>C1COCC1>[CH3:22][O:11][C:10](=[O:12])[C@@H:9]([NH:8][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])[CH2:13][C:14]1[CH:15]=[C:16]([F:21])[CH:17]=[C:18]([F:20])[CH:19]=1

Participants

6

Reactant 4

HCID 6497Dimethyl SulfateHCID 11430Potassium CarbonateHCID 14923Ammonium HydroxideHCID 27790093,5-Difluoro-L-phenylalanine, N-BOC protected

Product 1

HCID 9836527(2S)-2-[(tert-Butoxycarbonyl)amino]-3-(3,5-difluorophenyl)propionic acid methyl ester

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

(2S)-2-[(tert-butoxycarbonyl)amino]-3-(3,5-difluorophenyl)propanoic acid (1,5.0 g, 0.017 moles, 1.0 equivalent) and potassium carbonate (2.5 g, 0.018 moles, 1.1 equivalent) are mixed in THF (100 mL). To this heterogeneous mixture is then added dimethyl sulfate (1.6 mL, 2.1 g, 0.017 moles, 1.0 equivalent) and the contents were then stirred at 20-25° overnight. Once the reaction is complete as measured by HPLC, ammonium hydroxide (10%, 20 mL) is added and allowed to stir for 1 hr at which time the contents are extracted with ethyl acetate (3×50 mL). The combined organic phases are washed with water (50 mL) and saline (50 mL), dried over sodium sulfate, filtered, and concentrated under reduced pressure to give the title compound.

Workup

  1. additionis added
  2. extractionare extracted with ethyl acetate (3×50 mL)
  3. washThe combined organic phases are washed with water (50 mL) and saline (50 mL)
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-09cbe9de67c048bd8944bf1bc1e62db4
Source dataset
uspto-grants-2005_02
Patent number
US06849750B2

Reaction notes

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