1-Bromo-2-methylpropane → 4-carboxy-2-isobutyl-6-[4-(methylthio)phenyl)-2H-pyridazin-3-one

HRID 1348745

Reaction equation

C[O:2][C:3]([C:5]1[C:6](=[O:19])[NH:7][N:8]=[C:9]([C:11]2[CH:16]=[CH:15][C:14]([S:17][CH3:18])=[CH:13][CH:12]=2)[CH:10]=1)=[O:4].C(=O)([O-])[O-].[K+].[K+].[CH2:26](Br)[CH:27]([CH3:29])[CH3:28].C(=O)([O-])O.[Na+]>CN(C)C=O>[C:3]([C:5]1[C:6](=[O:19])[N:7]([CH2:26][CH:27]([CH3:29])[CH3:28])[N:8]=[C:9]([C:11]2[CH:16]=[CH:15][C:14]([S:17][CH3:18])=[CH:13][CH:12]=2)[CH:10]=1)([OH:2])=[O:4]

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of 4-methoxycarbonyl-6-[4-(methylthio)phenyl]-2H-pyridazin-3-one (8.00 g, 29.0 mmol) in N,N-dimethylformamide (80 mL) were added potassium carbonate (8.02 g, 58.0 mmol) and isobutyl bromide (4.76 g, 34.8 mmol), and the mixture was stirred at 80° C. for 2 hours. The temperature of the reaction mixture was allowed to drop back to room temperature, and a saturated aqueous solution of sodium hydrogencarbonate was added. The mixture was then extracted with ethyl acetate. The extract was washed with brine, and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. Following the procedure of Example 1(7), the residue was reacted to yield the title compound as a yellow solid [yield: 65.1% (2 steps)].

Workup

customto drop back to room temperature
extractionThe mixture was then 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 reacted

Sources & evidence

ORD record: ord-0b77f2c3430d42eda6c94ff5907d8bf6
Source dataset: uspto-grants-2007_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07211577B2

Linked notes

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