Azobisisobutyronitrile → 1H-Pyrrolo[2,3-b]pyridine-3-carboxylic acid, 5-bromo-2-(bromomethyl)-1-(phenylsulfonyl)-, methyl ester

HRID 1505851Notes

Reaction equation

HRID 1505851 reaction equation
[CH3:1][O:2][C:3]([C:5]1[C:13]2[C:8](=[N:9][CH:10]=[C:11]([Br:14])[CH:12]=2)[N:7]([S:15]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)(=[O:17])=[O:16])[C:6]=1[CH3:24])=[O:4].C1C(=O)N([Br:32])C(=O)C1.CC(N=NC(C#N)(C)C)(C#N)C>ClCCCl.CCCCC>[CH3:1][O:2][C:3]([C:5]1[C:13]2[C:8](=[N:9][CH:10]=[C:11]([Br:14])[CH:12]=2)[N:7]([S:15]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)(=[O:17])=[O:16])[C:6]=1[CH2:24][Br:32])=[O:4]

Participants

6

Reactant 3

HCID 6547AzobisisobutyronitrileHCID 67184N-bromobutanimideHCID 582665641H-Pyrrolo[2,3-b]pyridine-3-carboxylic acid, 5-bromo-2-methyl-1-(phenylsulfonyl)-, methyl ester

Product 1

HCID 582663771H-Pyrrolo[2,3-b]pyridine-3-carboxylic acid, 5-bromo-2-(bromomethyl)-1-(phenylsulfonyl)-, methyl esterYield 94.2%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 8003PentaneSolvent

Procedure

To a solution of 1-benzenesulfonyl-5-bromo-2-methyl-1H-pyrrolo[2,3-b]pyridine-3-carboxylic acid methyl ester (0.42 g, 1.0 mmol) in 1,2-dichloroethane (9 mL) were added NBS (0.20 g, 1.1 mmol) and AIBN (30 mg, 0.2 mmol) and the reaction mixture was heated under reflux for 45 minutes. The reaction mixture was allowed to cool to ambient temperature and was diluted with pentane (4.0 mL), the solid was removed by filtration and the liquors were then concentrated in vacuo. The resultant residue was purified by chromatography (silica, 5 g cartridge, Si-SPE, 30-100% DCM in pentane) to afford the title compound as a white solid (0.46 g, 90%). LCMS (Method B): RT=4.55 min, M+H+=489.

Workup

  1. temperaturethe reaction mixture was heated
  2. temperatureunder reflux for 45 minutes
  3. customthe solid was removed by filtration
  4. concentrationthe liquors were then concentrated in vacuo
  5. customThe resultant residue was purified by chromatography (silica, 5 g cartridge, Si-SPE, 30-100% DCM in pentane)

Sources & evidence

ORD record
ord-db06d0bacfb044bda4ac6782303d0b4a
Source dataset
uspto-grants-2015_12
Patent number
US09216980B2

Reaction notes

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