Tetrabutylammonium Fluoride → (6-Hydroxy-indol-1-yl)-acetic acid ethyl ester

HRID 890439Notes

Reaction equation

HRID 890439 reaction equation
[CH2:1]([O:3][C:4](=[O:23])[CH2:5][N:6]1[C:14]2[C:9](=[CH:10][CH:11]=[C:12]([O:15][Si](C(C)(C)C)(C)C)[CH:13]=2)[CH:8]=[CH:7]1)[CH3:2].[F-].C([N+](CCCC)(CCCC)CCCC)CCC>C1COCC1>[CH2:1]([O:3][C:4](=[O:23])[CH2:5][N:6]1[C:14]2[C:9](=[CH:10][CH:11]=[C:12]([OH:15])[CH:13]=2)[CH:8]=[CH:7]1)[CH3:2]

Participants

4

Reactant 2

HCID 2724141Tetrabutylammonium FluorideHCID 68821689[6-(tert-Butyl-dimethyl-silanyloxy)-indol-1-yl]-acetic acid ethyl ester

Product 1

HCID 68821422(6-Hydroxy-indol-1-yl)-acetic acid ethyl esterYield 78.3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To an ice cold solution of [6-(tert-butyl-dimethyl-silanyloxy)-indol-1-yl]-acetic acid ethyl ester (1.15 g, 3.45 mmol) in THF (11.5 ml) was added a 1 M solution of tetrabutylammonium fluoride in THF (3.45 ml, 3.45 mmol) within 15 min. The reaction mixture was stirred for 1 h at ambient temperature, poured onto 1 N HCl/ice water 1/1 and extracted two times with ethyl acetate. The combined organic layers were washed with brine/ice water 1/1 and dried over sodium sulfate. The solvent was removed under reduced pressure and the residue purified by column chromatography (silica gel, heptane/AcOEt) to give 590 mg (2.7 mmol, 78%) of the title compound as colorless crystals.

Workup

  1. extractionextracted two times with ethyl acetate
  2. washThe combined organic layers were washed with brine/ice water 1/1
  3. dry with materialdried over sodium sulfate
  4. customThe solvent was removed under reduced pressure
  5. customthe residue purified by column chromatography (silica gel, heptane/AcOEt)

Sources & evidence

ORD record
ord-597f8de2feb04233a67c49e841279860
Source dataset
uspto-grants-2006_02
Patent number
US06995263B2

Reaction notes

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