Boron trifluoride etherate → 4-(3,4-Dimethoxy-5-nitrophenyl)-2-(2-(trifluoromethyl)pyridin-3-yl)oxazole

HRID 42655Notes

Reaction equation

HRID 42655 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.[F:21][C:22]([F:33])([F:32])[C:23]1[N:31]=[CH:30][CH:29]=[CH:28][C:24]=1[C:25]([NH2:27])=[O:26].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:27]=[C:25]([C:24]3[C:23]([C:22]([F:32])([F:21])[F:33])=[N:31][CH:30]=[CH:29][CH:28]=3)[O:26][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 64250582-(Trifluoromethyl)nicotinamideHCID 67037149HCID 67037149, compound

Product 1

HCID 687013284-(3,4-Dimethoxy-5-nitrophenyl)-2-(2-(trifluoromethyl)pyridin-3-yl)oxazole

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 2-(trifluoromethyl)nicotinamide (3.135 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 4-(3,4-dimethoxy-5-nitrophenyl)-2-(2-(trifluoromethyl)pyridin-3-yl)oxazole was obtained by column chromatography over silica gel (petroleum ether/ethylacetate 2:1) as a pale yellow solid, 2.488 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-24ee62c93c9f4e71b372e83d01c58824
Source dataset
uspto-grants-2013_09
Patent number
US08536203B2

Reaction notes

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