Sodium Bicarbonate → 8-(2-Fluoro-3,5-dimethoxy-phenyl)quinoxaline-5-carboxylic acid ethyl ester

HRID 2391890Notes

Reaction equation

HRID 2391890 reaction equation
[B-](F)(F)(F)F.[B-](F)(F)(F)F.C1[N+]2(CCl)CC[N+]([F:21])(CC2)C1.[CH2:22]([O:24][C:25]([C:27]1[C:28]2[N:29]=[CH:30][CH:31]=[N:32][C:33]=2[C:34]([C:37]2[CH:42]=[C:41]([O:43][CH3:44])[CH:40]=[C:39]([O:45][CH3:46])[CH:38]=2)=[CH:35][CH:36]=1)=[O:26])[CH3:23].C([O-])(O)=O.[Na+]>CC#N.CCOC(C)=O>[CH2:22]([O:24][C:25]([C:27]1[C:28]2[N:29]=[CH:30][CH:31]=[N:32][C:33]=2[C:34]([C:37]2[CH:38]=[C:39]([O:45][CH3:46])[CH:40]=[C:41]([O:43][CH3:44])[C:42]=2[F:21])=[CH:35][CH:36]=1)=[O:26])[CH3:23]

Participants

6

Reactant 3

HCID 516892Sodium BicarbonateHCID 2724933SelectfluorHCID 669146908-(3,5-Dimethoxy-phenyl)-quinoxaline-5-carboxylic acid ethyl ester

Product 1

HCID 669147948-(2-Fluoro-3,5-dimethoxy-phenyl)quinoxaline-5-carboxylic acid ethyl esterYield 46.8%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

SelectFluor (105 mg, 0.30 mmol) was added to a cold (−5° C.) solution of 8-(3,5-dimethoxy-phenyl)-quinoxaline-5-carboxylic acid ethyl ester (Step 115.1) (100 mg, 0.30 mmol) in CH3CN (2 mL), under an argon atmosphere. The reaction mixture was allowed to warm to rt over 6 h and stirred at that temperature for additional 12 h and diluted in EtOAc and a saturated aqueous solution of NaHCO3. The aqueous phase was separated and extracted with EtOAc. The combined organic layers were washed with H2O and brine, dried (Na2SO4), filtered and concentrated. The residue was purified by silica gel column chromatography (Hex/EtOAc, 3:2) to provide 50 mg of the title compound as an off-white solid. Title compound: ESI-MS: 357.2 [M+H]+; tR=4.58 min (System 1); TLC: Rf=0.24 (Hex/EtOAc, 3:2).

Workup

  1. customThe aqueous phase was separated
  2. extractionextracted with EtOAc
  3. washThe combined organic layers were washed with H2O and brine
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue was purified by silica gel column chromatography (Hex/EtOAc, 3:2)

Sources & evidence

ORD record
ord-91d64b42953f4b12bca960a5d72280a4
Source dataset
uspto-grants-2012_09
Patent number
US08273882B2

Reaction notes

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