Acetic Acid → HCID 22561828, compound

HRID 983022Notes

Reaction equation

HRID 983022 reaction equation
[NH:1]1[C:9]2[C:4](=[C:5]([C:10]3[CH:11]=[C:12]([CH2:16][C:17]([OH:19])=[O:18])[CH:13]=[CH:14][CH:15]=3)[CH:6]=[CH:7][CH:8]=2)[CH:3]=[CH:2]1.C([OH:22])C.C(O)(=O)C.[Br-].[Br-].[Br-].[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1>CC(O)(C)C.[Zn].O>[O:22]=[C:2]1[CH2:3][C:4]2[C:9](=[CH:8][CH:7]=[CH:6][C:5]=2[C:10]2[CH:11]=[C:12]([CH2:16][C:17]([OH:19])=[O:18])[CH:13]=[CH:14][CH:15]=2)[NH:1]1

Participants

8

Reactant 4

HCID 176Acetic Acid2×HCID 702EthanolHCID 21124087PyridiniumtribromideHCID 22561865HCID 22561865, compound

Product 1

HCID 22561828HCID 22561828, compound

Reagents, catalysts & solvents 3

HCID 23994ZincCatalystHCID 962WaterSolventHCID 6386tert-ButanolSolvent

Procedure

To the suspension of [3-(1H-indol-4-yl)phenyl]-acetic acid (3.52 g, 14 mmol) in t-BuOH: ethanol: acetic acid (93 mL: 56 mL: 67 mL) was added pyridinium tribromide (14.14 g, 42 mmol) portionwise. The mixture was stirred at room temperature for 3 hours, and then to the mixture was added acetic acid (60 mL). Water (2 mL) and zinc dust (14 g, excess) were added to the reaction mixture portionwise. After stirring for one hour, any unreacted zinc was filtered off and most of the solvent was removed under reduced pressure. The residue was diluted with ethyl acetate, washed with water (3×), sat. NaHCO3, brine, dried over Na2SO4 and concentrated to give 2.59 g (70%) of [3-2-oxo-2,3-dihydro-1H-indol-4-yl)-phenyl]-acetic acid.

Workup

  1. stirringAfter stirring for one hour
  2. filtrationany unreacted zinc was filtered off and most of the solvent
  3. customwas removed under reduced pressure
  4. additionThe residue was diluted with ethyl acetate
  5. washwashed with water (3×), sat. NaHCO3, brine
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated
  8. customto give 2.59 g (70%) of [3-2-oxo-2,3-dihydro-1H-indol-4-yl)-phenyl]-acetic acid

Sources & evidence

ORD record
ord-0cc0768fa4294aa9a311051113c04ba8
Source dataset
uspto-grants-2005_03
Patent number
US06861418B2

Reaction notes

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