Methyl iodide → 6-Bromo-1-methyl-1H-indole

HRID 525206Notes

Reaction equation

HRID 525206 reaction equation
[Br:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[CH:7][NH:8]2)=[CH:4][CH:3]=1.[C:11](=O)([O-])[O-].[K+].[K+].CI>CS(C)=O.O>[Br:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[CH:7][N:8]2[CH3:11])=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 6764936-Bromoindole

Product 1

HCID 155468546-Bromo-1-methyl-1H-indoleYield 62%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 962WaterSolvent

Procedure

A solution of 6-bromo-1H-indole (1.530 mmol) in dimethyl sulfoxide (10 mL) was treated with potassium carbonate (4.59 mmol) and was stirred at room temperature for 30 min. The solution was then treated with methyl iodide (1.683 mmol) and was stirred at room temperature overnight. The solution was diluted with water (100 mL) and was extracted with ethyl acetate. The combined organic phases were washed with water and brine, dried over magnesium sulfate, filtered and concentrated in vacuo. The crude residue was purified by silica gel chromatography (hexanes) to provide the title compound as a yellow oil (62%). 1H NMR (400 MHz, DMSO-d6) δ ppm 7.70 (s, 1H) 7.50 (d, J=8.34 Hz, 1H) 7.35 (d, J=3.03 Hz, 1H) 7.14 (dd, J=8.34, 1.77 Hz, 1H) 6.44 (d, J=3.03 Hz, 1H) 3.78 (s, 3H).

Workup

  1. stirringwas stirred at room temperature overnight
  2. extractionwas extracted with ethyl acetate
  3. washThe combined organic phases were washed with water and brine
  4. dry with materialdried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customThe crude residue was purified by silica gel chromatography (hexanes)

Sources & evidence

ORD record
ord-a9e6b7eb0b7e479e93cba818c4f6e4a1
Source dataset
uspto-grants-2016_05
Patent number
US09340529B2

Reaction notes

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