Acetic Acid → HCID 22561914, compound

HRID 1839627Notes

Reaction equation

HRID 1839627 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]2[CH:19]=[CH:18][CH:17]=[C:16]3[C:12]=2[CH:13]=[CH:14][NH:15]3)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].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>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]2[CH:19]=[CH:18][CH:17]=[C:16]3[C:12]=2[CH2:13][C:14](=[O:22])[NH:15]3)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10]

Participants

8

Reactant 4

HCID 176Acetic Acid2×HCID 702EthanolHCID 21124087PyridiniumtribromideHCID 225616844-(3,4-Dimethoxyphenyl)-1H-indole

Product 1

HCID 22561914HCID 22561914, compoundYield 65%

Reagents, catalysts & solvents 3

HCID 23994ZincCatalystHCID 962WaterSolventHCID 6386tert-ButanolSolvent

Procedure

To the suspension of 4-(3,4-dimethoxy-phenyl)-1H-indole (14.7 g, 58 mmol) in t-BuOH:ethanol:acetic acid (367 mL:217 mL:113 mL) was added pyridinium tribromide (55.68 g, 174 mmol) portionwise. The mixture was stirred at room temperature for 3 hours, and then to the mixture was added more acetic acid (287 mL). Zinc dust (18.95 g, 290 mmol) was added to the reaction mixture portionwise. After stirring for one hour, water was added to the reaction. The 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 (6×), sat. NaHCO3 (2×), brine (3×), dried over Na2SO4, concentrated and triturated with ether to give 10.14 g (65%) of 4-(3,4-dimethoxy-phenyl)-1,3-dihydro-indol-2-one as an earth colored solid.

Workup

  1. stirringAfter stirring for one hour
  2. filtrationThe 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 (6×), sat. NaHCO3 (2×), brine (3×)
  6. dry with materialdried over Na2SO4
  7. concentrationconcentrated
  8. customtriturated with ether

Sources & evidence

ORD record
ord-e202a04d313f4590937d5e1a0386b9b2
Source dataset
uspto-grants-2004_01
Patent number
US06677368B2

Reaction notes

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