Ethylene Glycol → 2-[2-(4-Methoxyphenyl)-[1,3]dioxolan-2-ylmethyl]isoindole-1,3-dione

HRID 751632Notes

Reaction equation

HRID 751632 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9](=[O:22])[CH2:10][N:11]2[C:19](=[O:20])[C:18]3[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=3)[C:12]2=[O:21])=[CH:5][CH:4]=1.[CH2:23](O)[CH2:24][OH:25].C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([C:9]2([CH2:10][N:11]3[C:19](=[O:20])[C:18]4[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=4)[C:12]3=[O:21])[O:25][CH2:24][CH2:23][O:22]2)=[CH:7][CH:8]=1

Participants

5

Reactant 3

HCID 174Ethylene GlycolHCID 6101p-Toluenesulfonic acidHCID 28156582-[2-(4-methoxyphenyl)-2-oxoethyl]-1H-isoindole-1,3(2H)-dione

Product 1

HCID 202718012-[2-(4-Methoxyphenyl)-[1,3]dioxolan-2-ylmethyl]isoindole-1,3-dione

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

2-[2-(4-Methoxyphenyl)-2-oxoethyl]isoindole-1,3-dione (Preparation 37, 6.35 g, 21.5 mmol) was suspended in toluene (50 mL) and ethylene glycol (12 mL) added. p-Toluenesulfonic acid (300 mg, 1.58 mmol) was added and the resulting mixture heated under reflux for 40 h, removing water with a Dean-Stark trap. The reaction mixture was allowed to cool to rt then partitioned between ethyl acetate (200 mL) and saturated aqueous sodium bicarbonate solution (100 mL). The organic layer was washed with brine (50 mL), dried (MgSO4), filtered and concentrated under reduced pressure, to give the title compound as an off-white solid. δH (d6 DMSO): 3.66 (2H, t), 3.72 (3H, s), 3.87 (4H, m), 6.88 (2H, d), 7.32 (2H, d), 7.83 (4H, m).

Workup

  1. temperaturethe resulting mixture heated
  2. temperatureunder reflux for 40 h
  3. customremoving water with a Dean-Stark trap
  4. customthen partitioned between ethyl acetate (200 mL) and saturated aqueous sodium bicarbonate solution (100 mL)
  5. washThe organic layer was washed with brine (50 mL)
  6. dry with materialdried (MgSO4)
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-36842df293a448c58cc5332f299fcfe6
Source dataset
uspto-grants-2008_07
Patent number
US07405210B2

Reaction notes

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