4-Nitrophenol → Boc-Phe-ONp

HRID 323543Notes

Reaction equation

HRID 323543 reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]([C:17]([OH:19])=[O:18])[CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH:20]1[C:25]([N+:26]([O-:28])=[O:27])=[CH:24][CH:23]=[C:22](O)[CH:21]=1.C1(N=C=NC2CCCCC2)CCCCC1>C(OCC)(=O)C>[N+:26]([C:25]1[CH:20]=[CH:21][C:22]([O:18][C:17](=[O:19])[C@H:9]([CH2:10][C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[NH:8][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])=[CH:23][CH:24]=1)([O-:28])=[O:27]

Participants

5

Reactant 3

HCID 9804-NitrophenolHCID 10868DicyclohexylcarbodiimideHCID 77857L-Phenylalanine, N-[(1,1-dimethylethoxy)carbonyl]-

Product 1

HCID 111308Boc-Phe-ONp

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent2×

Procedure

To a solution of N-tert-butoxycarbonylphenylalanine (53 g, 0.2 mol) and p-nitrophenol (27.8 g, 0.2 mol) in ethyl acetate (200 ml) in an ice-water bath was dropwise added a solution of N,N′-dicyclohexylcarbodiimide (41.2 g, 0.2 mol) in ethyl acetate (100 ml), and the mixture was stirred in an ice-water bath for 3 hours and then at room temperature for 20 hours. The precipitated N,N′-dicyclohexylcarbodiurea was filtered off and the filtrate was concentrated under reduced pressure. The residue thus obtained was recrystallized from ethyl acetate-hexane to give N-tert-butoxycarbonylphenylalanine p-nitrophenyl ester [61.7 g, 80% (% by weight, hereinafter the same)].

Workup

  1. waitat room temperature for 20 hours
  2. filtrationThe precipitated N,N′-dicyclohexylcarbodiurea was filtered off
  3. concentrationthe filtrate was concentrated under reduced pressure
  4. customThe residue thus obtained
  5. customwas recrystallized from ethyl acetate-hexane

Sources & evidence

ORD record
ord-6371755cb8d0454db2ee1d1422195d76
Source dataset
uspto-grants-2001_04
Patent number
US06214800B1

Reaction notes

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