Phenylhydrazine → 1-[4-(methylsulfonyl)phenyl]-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one

HRID 2089941Notes

Reaction equation

HRID 2089941 reaction equation
C[N:2](C)[CH:3]=[CH:4][C:5]([C:7]1[C:12](=[O:13])[CH:11]=[CH:10][N:9]([C:14]2[CH:19]=[CH:18][C:17]([S:20]([CH3:23])(=[O:22])=[O:21])=[CH:16][CH:15]=2)[N:8]=1)=O.[C:25]1([NH:31]N)[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1>CO>[CH3:23][S:20]([C:17]1[CH:18]=[CH:19][C:14]([N:9]2[CH:10]=[CH:11][C:12](=[O:13])[C:7]([C:5]3[N:31]([C:25]4[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=4)[N:2]=[CH:3][CH:4]=3)=[N:8]2)=[CH:15][CH:16]=1)(=[O:22])=[O:21]

Participants

4

Reactant 2

HCID 7516PhenylhydrazineHCID 667107233-[3-(dimethylamino)prop-2-enoyl]-1-[4-(methylsulfonyl)phenyl]pyridazin-4(1H)-one

Product 1

HCID 593700681-[4-(methylsulfonyl)phenyl]-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-oneYield 6%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

To a solution of 3-[3-(dimethylamino)prop-2-enoyl]-1-[4-(methylsulfonyl)phenyl]pyridazin-4(1H)-one (crude 615 mg, 1.77 mmol) in 20 mL of methanol was added phenylhydrazine (765 mg, 7.08 mmol). The mixture was, refluxed for 4 h and concentrated. The residue was dissolved in dichloromethane (20 mL), washed with 1N HCl aqueous solution and brine, dried over Na2SO4, and concentrated under reduced pressure. The residue was purified by prep-HPLC to give 1-[4-(methylsulfonyl)phenyl]-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one (42 mg, 6% for two steps) as a yellow solid.

Workup

  1. temperaturerefluxed for 4 h
  2. concentrationconcentrated
  3. dissolutionThe residue was dissolved in dichloromethane (20 mL)
  4. washwashed with 1N HCl aqueous solution and brine
  5. dry with materialdried over Na2SO4
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified by prep-HPLC

Sources & evidence

ORD record
ord-a5f13bca32344022af03c8d3841fe7c3
Source dataset
uspto-grants-2013_05
Patent number
US08435995B2

Reaction notes

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