Dimethylformamide → 2-(3-Bromo-1H-pyrazol-1-yl)-3-chloropyridine

HRID 2427024Notes

Reaction equation

HRID 2427024 reaction equation
[Br:1][C:2]1[CH:6]=[CH:5][NH:4][N:3]=1.Cl[C:8]1[C:13]([Cl:14])=[CH:12][CH:11]=[CH:10][N:9]=1.C(=O)([O-])[O-].[Cs+].[Cs+].CN(C)C=O>O>[Br:1][C:2]1[CH:6]=[CH:5][N:4]([C:8]2[C:13]([Cl:14])=[CH:12][CH:11]=[CH:10][N:9]=2)[N:3]=1

Participants

6

Reactant 4

HCID 6228DimethylformamideHCID 10796Cesium carbonateHCID 169882,3-DichloropyridineHCID 178419412HCID 178419412, compound

Product 1

HCID 210712782-(3-Bromo-1H-pyrazol-1-yl)-3-chloropyridineYield 68.5%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 10.7 g of 3-bromo-1H-pyrazole, 11.8 g of 2,3-dichloropyridine, 57.3 g of cesium carbonate and 80 ml of N,N-dimethylformamide was stirred at 100° C. for 8 hours. The reaction mixture was allowed to cool to room temperature, and water was poured thereto. The mixture was extracted with methyl tert-butyl ether two times. The organic layers were combined, washed successively with water and an aqueous saturated sodium chloride solution, dried over magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel column chromatography to obtain 12.9 g of 2-(3-bromo-1H-pyrazol-1-yl)-3-chloropyridine of the formula:

Workup

  1. temperatureto cool to room temperature
  2. extractionThe mixture was extracted with methyl tert-butyl ether two times
  3. washwashed successively with water
  4. dry with materialan aqueous saturated sodium chloride solution, dried over magnesium sulfate
  5. concentrationconcentrated under reduced pressure

Sources & evidence

ORD record
ord-1b9090d08ac14d649a19c7ad81150076
Source dataset
uspto-grants-2011_06
Patent number
US07968573B2

Reaction notes

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