Phenylsuccinic Anhydride → 1-(2,2,4,6,7-Pentamethyl-3-(4-methylphenyl)-2,3-dihydro-1-benzofuran-5-yl)-3-phenylpyrrolidine-2,5-dione

HRID 1272331Notes

Reaction equation

HRID 1272331 reaction equation
[CH3:1][C:2]1([CH3:22])[CH:6]([C:7]2[CH:12]=[CH:11][C:10]([CH3:13])=[CH:9][CH:8]=2)[C:5]2[C:14]([CH3:21])=[C:15]([NH2:20])[C:16]([CH3:19])=[C:17]([CH3:18])[C:4]=2[O:3]1.[C:23]1([CH:29]2[CH2:34][C:33](=O)[O:32][C:30]2=[O:31])[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.C([O-])(=O)C.[Na+]>C1(C)C=CC=CC=1.C(OC(=O)C)(=O)C>[CH3:1][C:2]1([CH3:22])[CH:6]([C:7]2[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][CH:12]=2)[C:5]2[C:14]([CH3:21])=[C:15]([N:20]3[C:33](=[O:32])[CH2:34][CH:29]([C:23]4[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=4)[C:30]3=[O:31])[C:16]([CH3:19])=[C:17]([CH3:18])[C:4]=2[O:3]1

Participants

6

Reactant 3

HCID 136911Phenylsuccinic AnhydrideHCID 517045Sodium AcetateHCID 106853092,2,4,6,7-Pentamethyl-3-(4-methylphenyl)-2,3-dihydro-1-benzofuran-5-amine

Product 1

HCID 102044451-(2,2,4,6,7-Pentamethyl-3-(4-methylphenyl)-2,3-dihydro-1-benzofuran-5-yl)-3-phenylpyrrolidine-2,5-dioneYield 50%

Reagents, catalysts & solvents 2

HCID 1140TolueneSolventHCID 7918Acetic AnhydrideSolvent

Conditions

Temperature
90 °C

Procedure

A solution of 2,2,4,6,7-pentamethyl-3-(4-methylphenyl)-2,3-dihydro-1-benzofuran-5-amine (2.95 g, 10 mmol) and phenylsuccinic anhydride (1.94 g, 11 mmol) in toluene was refluxed for 6 hours. The reaction mixture was concentrated under reduced pressure. The residue was diluted with water and extracted with ethyl acetate. The extract was washed with saturated aqueous sodium chloride, dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure. A mixture of the residue and sodium acetate (0.86 g, 10.5 mmol) in acetic anhydride (60 ml) was stirred at 90° C. for 1 hour. The reaction mixture was concentrated under reduced pressure. The residue was diluted with water and extracted with ethyl acetate. The extract was washed with saturated aqueous sodium chloride, dried over anhydrous sodium sulfate, and removed under reduced pressure. The residue was purified with silica gel column chromatography (hexane/ethyl acetate−4/1) to obtain 2.27 g (yield 50%) of the title compound. mp. 130–131° C. low polarity product, 1H-NMR (CDCl3) δ: 1.00 (3H, s)=1.52 (3H, s), 1.64 (3H, s), 2.02 (3H, s), 2.16 (3H, s), 2.30 (3H, s), 3.00 (1H, dd, J=4.7, 18.5 Hz), 3.36 (1H, dd, J=9.5, 18.5 Hz), 4.15–4.25 (2H, m), 6.85 (2H, br), 7.06 (2H, brd, J=6.6 Hz), 7.30–7.47 (5H, m).

Workup

  1. concentrationThe reaction mixture was concentrated under reduced pressure
  2. additionThe residue was diluted with water
  3. extractionextracted with ethyl acetate
  4. washThe extract was washed with saturated aqueous sodium chloride
  5. dry with materialdried over anhydrous sodium sulfate
  6. customThe solvent was removed under reduced pressure
  7. concentrationThe reaction mixture was concentrated under reduced pressure
  8. additionThe residue was diluted with water
  9. extractionextracted with ethyl acetate
  10. washThe extract was washed with saturated aqueous sodium chloride
  11. dry with materialdried over anhydrous sodium sulfate
  12. customremoved under reduced pressure
  13. customThe residue was purified with silica gel column chromatography (hexane/ethyl acetate−4/1)

Sources & evidence

ORD record
ord-ae528176bf5b40a1b00e3b09882a68dd
Source dataset
uspto-grants-2007_04
Patent number
US07208495B2

Reaction notes

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