Ethyl Acetate → 7-Bromo-8-(5-fluoro-2-methylphenoxymethyl)-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

HRID 871970Notes

Reaction equation

[Br:1][C:2]1[C:11]([CH2:12]Cl)=[C:10]2[C:5]([NH:6][C:7]([CH3:17])([CH3:16])[C:8](=[O:15])[N:9]2[CH3:14])=[CH:4][CH:3]=1.[F:18][C:19]1[CH:20]=[CH:21][C:22]([CH3:26])=[C:23]([OH:25])[CH:24]=1.C(=O)([O-])[O-].[K+].[K+].C(OCC)(=O)C>CN(C)C=O.O>[Br:1][C:2]1[C:11]([CH2:12][O:25][C:23]2[CH:24]=[C:19]([F:18])[CH:20]=[CH:21][C:22]=2[CH3:26])=[C:10]2[C:5]([NH:6][C:7]([CH3:17])([CH3:16])[C:8](=[O:15])[N:9]2[CH3:14])=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 7-bromo-8-chloromethyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one (Reference Compound No. 7, 801 mg, 2.52 mmol), 5-fluoro-2-methylphenol (330 μL, 3.02 mmol), and potassium carbonate (524 mg, 3.79 mmol) was suspended in anhydrous N,N-dimethylformamide (10 mL) and stirred at 80° C. overnight. After cooling down, ethyl acetate (80 mL) and water (50 mL) were added to the reaction mixture and partitioned. The organic layer was washed with saturated brine (50 mL), dried over anhydrous magnesium sulfate, and then the solvent was removed under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate) to give the titled reference compound (945 mg) as a colorless solid. (Yield 92%)

Workup

temperatureAfter cooling down
custompartitioned
washThe organic layer was washed with saturated brine (50 mL)
dry with materialdried over anhydrous magnesium sulfate
customthe solvent was removed under reduced pressure
customThe obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate)

Sources & evidence

ORD record: ord-b80ba1a804334267a8884854d2c2e82c
Source dataset: uspto-grants-2015_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08975256B2

Reaction notes

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