2-Bromo-5-chloro-3-fluoropyridine → 5-Chloro-3-fluoropyridine-2-carbonitrile

HRID 2262685Notes

Reaction equation

HRID 2262685 reaction equation
Br[C:2]1[C:7]([F:8])=[CH:6][C:5]([Cl:9])=[CH:4][N:3]=1.[C:10]([Cu])#[N:11]>>[Cl:9][C:5]1[CH:6]=[C:7]([F:8])[C:2]([C:10]#[N:11])=[N:3][CH:4]=1

Participants

3

Reactant 2

HCID 109657982-Bromo-5-chloro-3-fluoropyridineHCID 178418546HCID 178418546, compound

Product 1

HCID 220135625-Chloro-3-fluoropyridine-2-carbonitrileYield 66,434.602%

Conditions

Temperature
120 °C

Procedure

2-Bromo-5-chloro-3-fluoropyridine (107 g, 0.5 mmol) and CuCN (55 g, 0.62 mmol) were added to a round bottom flask with a magnetic stir bar. The flask was fitted with a septum and purged with nitrogen for 10 minutes. DMSO (430 mL) was then added by syringe and the resulting mixture stirred at 120° C. for 3 h. The reaction was cooled to room temperature and then poured into a vigorously stirred mixture of EtOAc (1 L) and brine (1 L). The organic layer was washed with water and brine, dried over sodium sulfate, filtered and concentrated in vacuo. Silica gel chromatography (15% ethyl ether, 85% hexanes) provided the title compound as an off-white solid (52 g, 67%). The product was characterized by 1H NMR.

Workup

  1. customThe flask was fitted with a septum
  2. custompurged with nitrogen for 10 minutes
  3. additionDMSO (430 mL) was then added by syringe
  4. temperatureThe reaction was cooled to room temperature
  5. additionpoured into a vigorously stirred mixture of EtOAc (1 L) and brine (1 L)
  6. washThe organic layer was washed with water and brine
  7. dry with materialdried over sodium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-fa0d05f9a1204551928c8f402cebda79
Source dataset
uspto-grants-2010_12
Patent number
US07851484B2

Reaction notes

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