Ammonium Chloride → HCID 18005445, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 35% potassium hydride in oil (0.7 g) in dry N,N-dimethylformamide (DMF) was added a solution of 5-amino-1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-4-(methylsulfinyl)-1H-pyrazole-3-carbonitrile (10.0 g) in dry DMF dropwise at 4° C. over 10 minutes. After stirring for 20 minutes, vinyl ethyl sulfone (3.13 g) in dry DMF was added during 5 hours at 4° C. The mixture was stirred overnight under nitrogen with warming to 20° C. Ammonium chloride was added at 4° C., and the mixture extracted (ethyl acetate), washed twice with water, dried (sodium sulfate) and evaporated. Crystallization from ethyl acetate/methanol/hexane gave 1-[2,6-dichloro-4-(trifluoromethyl)phenyl]-5-[2-(ethylsulfonyl)ethylamino]-4-(methylsulfinyl)-1H-pyrazole-3-carbonitrile (4.08 g), m.p. 131-132° C. By proceeding in a similar manner the following compounds were prepared:

Provenance & Evidence