Boron trifluoride etherate → HCID 67036906, compound

HRID 1401297Notes

Reaction equation

HRID 1401297 reaction equation
C(O[CH2:5][C:6]([C:8]1[CH:13]=[C:12]([N+:14]([O-:16])=[O:15])[C:11]([O:17][CH3:18])=[C:10]([O:19][CH3:20])[CH:9]=1)=O)(=O)C.[C:21]([C:24]1[C:25]([C:31]([F:34])([F:33])[F:32])=[N+:26]([O-:30])[CH:27]=[CH:28][CH:29]=1)(=[O:23])[NH2:22].B(F)(F)F.CCOCC>C1(C)C(C)=CC=CC=1>[CH3:20][O:19][C:10]1[CH:9]=[C:8]([C:6]2[N:22]=[C:21]([C:24]3[C:25]([C:31]([F:32])([F:34])[F:33])=[N+:26]([O-:30])[CH:27]=[CH:28][CH:29]=3)[O:23][CH:5]=2)[CH:13]=[C:12]([N+:14]([O-:16])=[O:15])[C:11]=1[O:17][CH3:18]

Participants

5

Reactant 3

HCID 8000Boron trifluoride etherateHCID 670370221-Oxo-2-(trifluoromethyl)-1lambda~5~-pyridine-3-carboxamideHCID 67037149HCID 67037149, compound

Product 1

HCID 67036906HCID 67036906, compound

Reagents, catalysts & solvents 1

HCID 7237O-XyleneSolvent

Procedure

To a solution of 2-(3,4-dimethoxy-5-nitrophenyl)-2-oxoethyl acetate (4.24 g, 15 mmol) in xylene (30 mL) were added 3-carbamoyl-2-(trifluoromethyl)pyridine 1-oxide (3.40 g, 16.5 mmol) and boron trifluoride etherate (0.18 mL, 15 mmol). The resulting yellow solution was heated to reflux for 18 hours and then cooled to room temperature. After evaporation of the solvent, the residue was partitioned between ethyl acetate and saturated aqueous sodium bicarbonate. The organic phase was separated, washed with brine and the dried over anhydrous magnesium sulphate, filtered and evaporated. The pure 3-(4-(3,4-dimethoxy-5-nitrophenyl)oxazol-2-yl)-2-(trifluoromethyl)pyridine 1-oxide was obtained by column chromatography over silica gel (petroleum ether/ethylacetate 2:1) as a pale yellow solid, 2.58 g (42%).

Workup

  1. temperatureThe resulting yellow solution was heated
  2. temperatureto reflux for 18 hours
  3. customAfter evaporation of the solvent
  4. customthe residue was partitioned between ethyl acetate and saturated aqueous sodium bicarbonate
  5. customThe organic phase was separated
  6. washwashed with brine
  7. dry with materialthe dried over anhydrous magnesium sulphate
  8. filtrationfiltered
  9. customevaporated

Sources & evidence

ORD record
ord-7a8bb3c47569439abbf05ce99e1aed41
Source dataset
uspto-grants-2014_12
Patent number
US08907099B2

Reaction notes

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