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Azobisisobutyronitrile → 4-Chloro-5-fluoro-alpha-bromo-2-picoline

HRID 1865
Notes
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Reaction equation

HRID 1865 reaction equation
[Cl:1][C:2]1[C:7]([F:8])=[CH:6][N:5]=[C:4]([CH3:9])[CH:3]=1.[Br:10]N1C(=O)CCC1=O.CC(N=NC(C#N)(C)C)(C#N)C>ClCCCl.C(Cl)Cl>[Cl:1][C:2]1[C:7]([F:8])=[CH:6][NH:5][C:4]([Br:10])([CH3:9])[CH:3]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 6547AzobisisobutyronitrileHCID 67184N-bromobutanimideHCID 196914104-Chloro-5-fluoro-2-methylpyridine2×

Product 1

HCID 867500424-Chloro-5-fluoro-alpha-bromo-2-picolineYield 69%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolvent
HCID 6344
Dichloromethane
Solvent

Conditions

Temperature
75 °C

Procedure

4-Chloro-5-fluoro-2-picoline (2.9 g, 20 mmol), the product of Example 66, was dissolved in 50 mL of 1,2-dichloroethane in a dry flask. The resultant solution was heated, with stirring, to 75° C. and 4.09 (23 mmol) of N-bromosuccinimide was added, followed by 100 mG (0.7 mmol) of 2,2-azobisisobutyronirile (AIBN), a free radical initiator. After the reaction mixture was stirred at 75° C. for 24 hours, it was diluted with 450 mL of methylene chloride and washed with 3 X 400 mL of water. The organic layer was separated and dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was dried in vacuo to give 3.5 g (69% yield) of the title compound as an amber oil; 1H NMR (CDCl3) d 4.50 (s, 2H), 7.54 (d, 1H), 8.44 (s, 1H).

Workup

  1. stirringAfter the reaction mixture was stirred at 75° C. for 24 hours
  2. washwashed with 3 X 400 mL of water
  3. customThe organic layer was separated
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was dried in vacuo

Sources & evidence

ORD record
ord-b9b54b14eaa34567839b3bc713494b14
Source dataset
uspto-grants-1998_03
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US05726182

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes