Cesium carbonate → 5-Fluoro-2-(2,2,2-trifluoroethoxy)nitrobenzene
Reaction equation
[F:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[C:4]([N+:9]([O-:11])=[O:10])[CH:3]=1.C(=O)([O-])[O-].[Cs+].[Cs+].C1(C)C=CC(S(O[CH2:28][C:29]([F:32])([F:31])[F:30])(=O)=O)=CC=1>CN(C)C=O>[F:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][CH2:28][C:29]([F:32])([F:31])[F:30])=[C:4]([N+:9]([O-:11])=[O:10])[CH:3]=1Participants
5
Conditions
- Temperature
- 100 °C
Procedure
A stirred mixture of 3.14 g of 4-fluoro-2-nitrophenol, 13 g of cesium carbonate and 20 mL of anhydrous dimethylformamide was heated at 100° C. for 4 hours. 6.65 g of 2,2,2-trifluoroethyl p-toluenesulphonate was then added and the mixture was stirred at the same temperature for 40 hours. The solvent was removed under reduced pressure, and 50 mL of water was added to the residue. The mixture was acidified with 37% hydrochloric acid and extracted with 3×40 mL of ethyl acetate. The organic layer was washed with 20 mL of brine, dried over sodium sulphate and evaporated to dryness under reduced pressure. The residue was purified by flash chromatography (petroleum ether/ethyl acetate 100:7) to afford 1.53 g (32%) of Compound 8A as an oil.
Workup
- customThe solvent was removed under reduced pressure, and 50 mL of water
- additionwas added to the residue
- extractionextracted with 3×40 mL of ethyl acetate
- washThe organic layer was washed with 20 mL of brine
- dry with materialdried over sodium sulphate
- customevaporated to dryness under reduced pressure
- customThe residue was purified by flash chromatography (petroleum ether/ethyl acetate 100:7)
Sources & evidence
- ORD record
- ord-ba06b14594f64a7d93c5775c6769eba0
- Source dataset
- uspto-grants-2002_06
- Patent number
- US06403594B1
Reaction notes
Loading…