Reaction #586126

Reaction equation

1,1′-thiodi-[2-cyano-5-(3-trifluoromethylpyrazolyl)benzene]

Rongalite

potassium carbonate

2,2,2-trifluoroethyl iodide

→

2-(2,2,2-trifluoroethylthio)-4-(3-trifluoromethylpyrazolyl)benzonitrile

Yield 142.3%

Solvents

water

N,N-dimethylformamide

Conditions

Workup

1. 1
   OtherThe resulting reaction mixture
2. 2
   Extractionextracted with 50 ml of ethyl acetate twice
3. 3
   WashThe ethyl acetate layer was washed with 50 ml of water twice
4. 4
   Dryingdried over anhydrous magnesium sulfate
5. 5
   workup.DISTILLATIONthe ethyl acetate was distilled off under reduced pressure
6. 6
   OtherPurification of the residue by silica gel column chromatography

Procedure

2.7 g (5.0 mmol) of 1,1′-thiodi-[2-cyano-5-(3-trifluoromethylpyrazolyl)benzene], 3.0 g (19.5 mmol) of Rongalite, 3.0 g (21.7 mmol) of potassium carbonate and 6.1 g (29.0 mmol) of 2,2,2-trifluoroethyl iodide were stirred in 50 ml of N,N-dimethylformamide at room temperature for 3 hours. The resulting reaction mixture was poured into 300 ml of water and extracted with 50 ml of ethyl acetate twice. The ethyl acetate layer was washed with 50 ml of water twice and dried over anhydrous magnesium sulfate, and the ethyl acetate was distilled off under reduced pressure. Purification of the residue by silica gel column chromatography afforded 2.5 g of 2-(2,2,2-trifluoroethylthio)-4-(3-trifluoromethylpyrazolyl)benzonitrile (yield 71.4%) as a brown solid (m.p. 65-67° C.).

Source