Methyl iodide → Methyl indole-6-carboxylate

HRID 576630Notes

Reaction equation

HRID 576630 reaction equation
IC.[NH:3]1[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([C:12]([OH:14])=[O:13])[CH:10]=2)[CH:5]=[CH:4]1.[C:15](=O)([O-])[O-].[K+].[K+]>CN(C=O)C>[CH3:15][O:13][C:12]([C:9]1[CH:10]=[C:11]2[C:6]([CH:5]=[CH:4][NH:3]2)=[CH:7][CH:8]=1)=[O:14]

Participants

5

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 5952301H-indole-6-carboxylic acid

Product 1

HCID 639844Methyl indole-6-carboxylate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Iodomethane (0.75 mL, 12.0 mmol) was added to a suspension of indole-6-carboxylic acid (1.68 g, 10.5 mmol) and potassium carbonate (2.16 g, 15.7 mmol) in DMF (30 mL) under argon. The reaction was stirred at room temperature for 19 hr. The reaction was quenched with sat. NH4Cl and extracted with ethyl acetate (2×). The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated. The crude product was purified by flash chromatography on silica gel (0-60% EtOAc:Hexane). ESI-MS m/z 176 (MH)+.

Workup

  1. customThe reaction was quenched with sat. NH4Cl
  2. extractionextracted with ethyl acetate (2×)
  3. washThe combined organic layers were washed with brine
  4. dry with materialdried over Na2SO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe crude product was purified by flash chromatography on silica gel (0-60% EtOAc:Hexane)

Sources & evidence

ORD record
ord-f3ca6e4484234a158a943d3e2f08e1ff
Source dataset
uspto-grants-2015_05
Patent number
US09040504B2

Reaction notes

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