Benzenebutanoic acid, gamma-oxo-, methyl ester → methyl (4E)-4-hydroxyimino-4-phenylbutanoate

HRID 1070033Notes

Reaction equation

HRID 1070033 reaction equation
[C:1]([CH2:9][CH2:10][C:11]([O:13][CH3:14])=[O:12])(=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.[NH2:16][OH:17].C([O-])(=O)C.[Na+]>CO>[OH:17]/[N:16]=[C:1](/[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)\[CH2:9][CH2:10][C:11]([O:13][CH3:14])=[O:12]

Participants

5

Reactant 3

HCID 141190Benzenebutanoic acid, gamma-oxo-, methyl esterHCID 443297Hydroxyamine hydrochlorideHCID 517045Sodium Acetate

Product 1

HCID 12137371methyl (4E)-4-hydroxyimino-4-phenylbutanoateYield 91%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of methyl 3-benzoylpropionate (15.0 g), hydroxylamine hydrochloride (6.50 g), sodium acetate (9.60 g) and methanol (150 ml) was heated under reflux for 8 hours. The reaction mixture was concentrated, and the residue was diluted with water and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried (MgSO4), and then concentrated. The residue was subjected to column chromatography on silica gel, and methyl E-4-hydroxyimino-4-phenylbutyrate (14.7 g, yield 91%) was obtained as an oil from a fraction eluted with ethyl acetate-hexane (1:3, v/v).

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for 8 hours
  3. concentrationThe reaction mixture was concentrated
  4. additionthe residue was diluted with water
  5. extractionextracted with ethyl acetate
  6. washThe ethyl acetate layer was washed with water
  7. dry with materialdried (MgSO4)
  8. concentrationconcentrated

Sources & evidence

ORD record
ord-a519e7741bbf4f1eb83c2470d27b629b
Source dataset
uspto-grants-2001_06
Patent number
US06251926B1

Reaction notes

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