4-Chloropyridine-2-carboxamide → HCID 131732555, compound

HRID 872986Notes

Reaction equation

HRID 872986 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([NH:9][C:10]([C:12]2[C:13](=[O:25])[N:14]([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=3)[N:15]([CH3:18])[C:16]=2[CH3:17])=[O:11])[CH:5]=[CH:6][C:7]=1[OH:8].CC([O-])(C)C.[K+].Cl[C:33]1[CH:38]=[CH:37][N:36]=[C:35]([C:39]([NH2:41])=[O:40])[CH:34]=1>CN(C=O)C>[Cl:1][C:2]1[CH:3]=[C:4]([NH:9][C:10]([C:12]2[C:13](=[O:25])[N:14]([C:19]3[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=3)[N:15]([CH3:18])[C:16]=2[CH3:17])=[O:11])[CH:5]=[CH:6][C:7]=1[O:8][C:34]1[C:35]([C:39]([NH2:41])=[O:40])=[N:36][CH:37]=[CH:38][CH:33]=1

Participants

5

Reactant 3

HCID 3035434-Chloropyridine-2-carboxamideHCID 23665647Potassium tert-butoxideHCID 90025110HCID 90025110, compound

Product 1

HCID 131732555HCID 131732555, compoundYield 40.5%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a suspension of N-(3-chloro-4-hydroxyphenyl)-1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxamide (1.074 g, 3.0 mmol) in DMF (12 mL) was added t-BuOK (539 mg, 4.8 mmol). The mixture was stirred at rt for 30 minutes, then 4-chloropicolinamide (517 mg, 3.3 mmol) was added. The mixture was stirred at 120° C. for 36 hours, then cooled to rt, quenched with 50 mL of water and extracted with EtOAc (50 mL×3). The combined organic phases were washed with brine (50 mL×3), dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by a silica gel column chromatography (EtOAc/PE (v/v)=3/1) to give the title compound as a white solid (580 mg, 40.4%).

Workup

  1. stirringThe mixture was stirred at 120° C. for 36 hours
  2. temperaturecooled to rt
  3. customquenched with 50 mL of water
  4. extractionextracted with EtOAc (50 mL×3)
  5. washThe combined organic phases were washed with brine (50 mL×3)
  6. dry with materialdried over anhydrous Na2SO4
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by a silica gel column chromatography (EtOAc/PE (v/v)=3/1)

Sources & evidence

ORD record
ord-763a7986e0364e229b8c84099cacb054
Source dataset
uspto-grants-2015_03
Patent number
US08975282B2

Reaction notes

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