Hydrochloric Acid → 1-benzyl-6-bromo-1H-indole

HRID 2221188Notes

Reaction equation

HRID 2221188 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.[H-].[Na+].[CH2:13](Br)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1.Cl>CN(C=O)C.O>[CH2:13]([N:8]1[C:9]2[C:5](=[CH:4][CH:3]=[C:2]([Br:1])[CH:10]=2)[CH:6]=[CH:7]1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 7498Benzyl BromideHCID 24758Sodium hydrideHCID 6764936-Bromoindole

Product 1

HCID 220329571-benzyl-6-bromo-1H-indoleYield 80%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

A solution of 6-bromoindole (5.0 g, 26 mmol) in dry DMF (45 mL) was cooled in an ice bath. Sodium hydride (2.2 g of 60% dispersion in oil, 55 mmol) was added. After stirring for 30 minutes under nitrogen at room temperature, the reaction mixture was cooled in an ice bath, and benzyl bromide (6.1 mL, 51 mmol) was added. After stirring for one hour at room temperature, the reaction mixture was poured into excess water, acidified with 2N hydrochloric acid and extracted with ethyl acetate. The organic phase was then washed with water and brine, then dried over anhydrous magnesium sulfate and evaporated to dryness. Purification of the residue by flash chromatography using hexane as an eluant and drying for 30 minutes at 60° C. yielded 1-benzyl-6-bromo-1H-indole (5.83 g, 80%) as a waxy solid, mp: 85-88° C. Mass spectrum (+ESI, [M+H]+) m/z 286; 1HNMR (500 MHz, DMSO-d6): δ 7.7 (d, 1H, J=0.61 Hz), 7.50-7.55 (m, 2H), 7.30 (t, 2H, J=7.3 Hz), 7.2-7.25 (m, 1H), 7.2 (d, 2H, J=8.4 Hz), 7.15 (dd, 1H, J=8.4 Hz and 1.7 Hz), 6.5 (dd, 1H, J=3.1 Hz and 0.77 Hz), and 5.45 ppm (s, 2H).

Workup

  1. temperaturethe reaction mixture was cooled in an ice bath
  2. stirringAfter stirring for one hour at room temperature
  3. extractionextracted with ethyl acetate
  4. washThe organic phase was then washed with water and brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. customevaporated to dryness
  7. customPurification of the residue by flash chromatography
  8. customdrying for 30 minutes at 60° C.

Sources & evidence

ORD record
ord-23486677df49499a8985ee43da5948db
Source dataset
uspto-grants-2008_05
Patent number
US07368471B2

Reaction notes

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