Benzoyl Peroxide → 2-Bromo-5-bromomethylpyridine

HRID 1173217Notes

Reaction equation

HRID 1173217 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][N:3]=1.[Br:9]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>C(Cl)(Cl)(Cl)Cl>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][Br:9])=[CH:4][N:3]=1

Participants

5

Reactant 3

HCID 7187Benzoyl PeroxideHCID 67184N-bromobutanimideHCID 5642162-Bromo-5-methylpyridine

Product 1

HCID 64246602-Bromo-5-bromomethylpyridine

Reagents, catalysts & solvents 1

HCID 5943Carbon TetrachlorideSolvent

Procedure

2-Bromo-5-methylpyridine (5.00 g, 29.1 mmoles) and N-bromosuccinimide (5.22 g, 29.3 mmoles) were dissolved in carbon tetrachloride (40 mL) under nitrogen. Benzoyl peroxide (0.35 g, 1.4 mmoles) was added and the mixture heated at reflux for four hours. The mixture was cooled to room temperature, filtered, and washed with NaHCO3/H2O. The mixture was adsorbed onto silica gel and then chromatographed. eluting with a gradient of hexane to 10% ethyl acetate/hexane. Pure fractions were combined and concentrated to provide the desired mono-brominated product as a pale yellow solid, 3.60 g (49%). LC/MS (positive ion) m/z=249.8, 251.8, 253.8, (M+H)+. Step B

Workup

  1. temperaturethe mixture heated
  2. temperatureat reflux for four hours
  3. filtrationfiltered
  4. washwashed with NaHCO3/H2O
  5. customchromatographed
  6. washeluting with a gradient of hexane to 10% ethyl acetate/hexane
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-9653156868734f29b81856566a8bc456
Source dataset
uspto-grants-2010_11
Patent number
US07834021B2

Reaction notes

Loading…