Water → L-Phenylalanine, methyl ester

HRID 2230187Notes

Reaction equation

HRID 2230187 reaction equation
[CH3:1][O:2][C:3](=[O:29])[C@H:4]([CH2:19][C:20]1[CH:25]=[CH:24][C:23]([N+]([O-])=O)=[CH:22][CH:21]=1)[NH:5]C(C1(CCNC(=O)C)CCCC1)=S.O.ClCCl.CC(C)=O>CO.C(OCC)(=O)C.[Cl-].[NH4+].[Zn]>[CH3:1][O:2][C:3](=[O:29])[C@H:4]([CH2:19][C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)[NH2:5]

Participants

8

Reactant 3

HCID 962WaterHCID 12042588HCID 12042588, compoundHCID 21584124Propan-2-one--dichloromethane (1/1)

Product 1

HCID 736234L-Phenylalanine, methyl esterYield 207.3%

Reagents, catalysts & solvents 4

HCID 23994ZincCatalystHCID 887MethanolSolventHCID 8857Ethyl AcetateSolventHCID 25517Ammonium ChlorideSolvent2×

Procedure

To a suspension of N-[[1-[2-(acetylamino)ethyl]cyclopentyl]thioxomethyl]-4-nitro-L-phenylalanine methyl ester (740 mg, 1.75 mmol), zinc dust (1.14 g, 17.5 mmol) and ammonium chloride (1.41 g, 26.3 mmol) in methanol (20 mL) was added H2O (10 mL) slowly over 5 min. After stirring for 20 min, the reaction mixture was diluted with ethyl acetate (80 mL) and sat. ammonium chloride solution (25 mL). The separated aqueous layer was back-extracted with ethyl acetate (3×25 mL) and the organic layers were combined, dried over Na2SO4, filtered and concentrated in vacuo. The residual oil was dried under high vacuum for 2 h to give the crude amine (750 mg)which was by flash silica gel column chromatography (dichloromethane-acetone 2:1) to furnish 4-amino-N-[[1-[2-acetylamino)ethyl]cyclopentyl]thioxomethyl]-L-phenylalanine methyl ester (650 mg, 95%). HR MS: Obs. mass, 392.2016. Calcd. mass, 392.2008 (M+H).

Workup

  1. extractionThe separated aqueous layer was back-extracted with ethyl acetate (3×25 mL)
  2. dry with materialdried over Na2SO4
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe residual oil was dried under high vacuum for 2 h
  6. customto give the crude amine (750 mg)which

Sources & evidence

ORD record
ord-0c521e12a0cc4ba795eafe8087b071ae
Source dataset
uspto-grants-2002_07
Patent number
US06423728B1

Reaction notes

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