Hydrochloric Acid → 4-carboxy-6-(3-fluoro-4-methylphenyl)-2-isobutyl-2H-pyridazin-3-one
Reaction equation
[F:1][C:2]1[CH:3]=[C:4]([C:9]2[CH:10]=[C:11]([C:20]([O:22]C)=[O:21])[C:12](=[O:19])[N:13]([CH2:15][CH:16]([CH3:18])[CH3:17])[N:14]=2)[CH:5]=[CH:6][C:7]=1[CH3:8].[OH-].[Na+].O.Cl>CO>[C:20]([C:11]1[C:12](=[O:19])[N:13]([CH2:15][CH:16]([CH3:17])[CH3:18])[N:14]=[C:9]([C:4]2[CH:5]=[CH:6][C:7]([CH3:8])=[C:2]([F:1])[CH:3]=2)[CH:10]=1)([OH:22])=[O:21]Participants
6
Reactant 4
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 60 °C
Procedure
To a suspension of 6-(3-fluoro-4-methylphenyl)-2-isobutyl-4-methoxycarbonyl-2H-pyridazin-3-one (5.27 g, 16.6 mmol) in methanol (50 mL) was added a 2 mol/L aqueous sodium hydroxide (50 mL), and the mixture was stirred at 60° C. for 15 minutes. The temperature of the reaction mixture was allowed to drop back to room temperature, and then, water was added. After the system was acidified with concentrated hydrochloric acid, the mixture was extracted with ethyl acetate. The extract was washed with brine, and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the residue was recrystallized from chloroform-hexane to yield the title compound as colorless fine-needles (4.73 g, 93.8%).
Workup
- customto drop back to room temperature
- extractionthe mixture was extracted with ethyl acetate
- washThe extract was washed with brine
- dry with materialdried over anhydrous sodium sulfate
- distillationThe solvent was distilled off under reduced pressure
- customthe residue was recrystallized from chloroform-hexane
Sources & evidence
- ORD record
- ord-d70066a9bfbc465fa25ef6fff631ad2a
- Source dataset
- uspto-grants-2005_03
- Patent number
- US06861428B2
Reaction notes
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