Pyrazole → HCID 59436250, compound

HRID 1895226

Reaction equation

HRID 1895226 reaction equation
I[C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH:13]=[C:12]([O:14][CH3:15])[C:11](=[O:16])[C:10]([C:17]([N:19]([O:21][CH3:22])[CH3:20])=[O:18])=[N:9]2)=[C:4]([O:23][CH3:24])[CH:3]=1.[NH:25]1[CH:29]=[CH:28][CH:27]=[N:26]1.C(=NO)C1C(=CC=CC=1)O.C([O-])([O-])=O.[Cs+].[Cs+]>CC#N.O>[CH3:22][O:21][N:19]([CH3:20])[C:17]([C:10]1[C:11](=[O:16])[C:12]([O:14][CH3:15])=[CH:13][N:8]([C:5]2[CH:6]=[CH:7][C:2]([N:25]3[CH:29]=[CH:28][CH:27]=[N:26]3)=[CH:3][C:4]=2[O:23][CH3:24])[N:9]=1)=[O:18]

Participants

7

Reactant 4

HCID 1048PyrazoleHCID 7200Salicylaldehyde oximeHCID 10796Cesium carbonateHCID 594362051-(4-iodo-2-methoxyphenyl)-N,5-dimethoxy-N-methyl-4-oxo-1,4-dihydropyridazine-3-carboxamide

Product 1

HCID 59436250HCID 59436250, compoundYield 68.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6342AcetonitrileSolvent

Procedure

A suspension of 1-(4-iodo-2-methoxyphenyl)-N,5-dimethoxy-N-methyl-4-oxo-1,4-dihydropyridazine-3-carboxamide (10.7 g, 24 mmol), pyrazole (1.63 g, 24 mmol), Cu2O (0.343 g, 2.4 mmol), salicylaldoxime (1.32 g, 9.6 mmol), and Cs2CO3 (15.6 g, 48 mmol) in CH3CN (100 mL) was refluxed for 4 h under Ar atmosphere. After cooling to room temperature, the reaction mixture was poured into water and extracted with AcOEt. The extract was washed with brine, dried over MgSO4, and concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography eluting with AcOEt/THF (1/0-0/1) to give the title compound (6.32 g, 68% yield) as a pale yellow amorphous solid: 1H NMR (300 MHz, CDCl3): δ ppm 3.39 (3H, s), 3.73 (3H, s), 3.91 (3H, s), 3.99 (3H, s), 6.53 (1H, dd, J=1.9, 2.3 Hz), 7.27 (1H, dd, J=2.3, 8.7 Hz), 7.58 (1H, d, J=8.7 Hz), 7.61 (1H, d, J=1.9 Hz), 7.77 (1H, d, J=1.5 Hz), 7.84 (1H, s), 7.98 (1H, d, J=2.3 Hz).

Workup

  1. temperaturewas refluxed for 4 h under Ar atmosphere
  2. extractionextracted with AcOEt
  3. washThe extract was washed with brine
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by basic silica gel column chromatography
  7. washeluting with AcOEt/THF (1/0-0/1)

Sources & evidence

ORD record
ord-18ea68eb62a74b6f98a54aa025780ee9
Source dataset
uspto-grants-2013_08
Patent number
US08513251B2

Linked notes

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