Ethyl Acetate → 7-(5-Chloro-2-methoxyphenyl)-8-methoxycarbonyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

HRID 871972Notes

Reaction equation

HRID 871972 reaction equation
Br[C:2]1[C:11]([C:12]([O:14][CH3:15])=[O:13])=[C:10]2[C:5]([NH:6][C:7]([CH3:19])([CH3:18])[C:8](=[O:17])[N:9]2[CH3:16])=[CH:4][CH:3]=1.[Cl:20][C:21]1[CH:22]=[CH:23][C:24]([O:30][CH3:31])=[C:25](B(O)O)[CH:26]=1.C(=O)([O-])[O-].C(OCC)(=O)C>CN(C)C=O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O.C(OCC)C>[Cl:20][C:21]1[CH:26]=[CH:25][C:24]([O:30][CH3:31])=[C:23]([C:2]2[C:11]([C:12]([O:14][CH3:15])=[O:13])=[C:10]3[C:5]([NH:6][C:7]([CH3:19])([CH3:18])[C:8](=[O:17])[N:9]3[CH3:16])=[CH:4][CH:3]=2)[CH:22]=1

Participants

9

Reactant 4

HCID 8857Ethyl AcetateHCID 19660Carbonate IonHCID 27357515-Chloro-2-methoxyphenylboronic acidHCID 247809997-Bromo-8-methoxycarbonyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one

Product 1

HCID 247809987-(5-Chloro-2-methoxyphenyl)-8-methoxycarbonyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-oneYield 86%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 3283Diethyl EtherSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of 7-bromo-8-methoxycarbonyl-1,3,3-trimethyl-3,4-dihydro-1H-quinoxalin-2-one (Reference Compound No. 9, 3.75 g, 11.5 mmol), 5-chloro-2-methoxyphenylboronic acid (2.57 g, 13.8 mmol), cessium carbonate (7.49 g, 23.0 mmol) and tetrakis(triphenylphosphine)palladium (0) (1.33 g, 1.16 mmol) was suspended in anhydrous N,N-dimethylformamide (70 ml) and stirred at 80° C. overnight under argon atmosphere. After cooling down, ethyl acetate (300 mL), diethylether (150 mL) and water (400 mL) were added and partitioned. The organic layer was washed with water (250 mL) and saturated brine (150 mL) successively, 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 (3.84 g) as a colorless amorphous product. (Yield 86%)

Workup

  1. temperatureAfter cooling down
  2. custompartitioned
  3. washThe organic layer was washed with water (250 mL) and saturated brine (150 mL) successively
  4. dry with materialdried over anhydrous magnesium sulfate
  5. customthe solvent was removed under reduced pressure
  6. customThe obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate)

Sources & evidence

ORD record
ord-d4c9c12995e14589bca3bf7b504f3b1d
Source dataset
uspto-grants-2015_03
Patent number
US08975256B2

Reaction notes

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