N,N-Dimethylcyclohexylamine → 4-ethenyl-1,5-dimethyl-3-(trifluoromethyl)-1H-pyrazolyl-3,5-bis(trifluoromethyl)benzene

Participants

Reaction Conditions

Reaction Steps

10 g of 3,5-bis(trifluoromethyl)bromobenzene are mixed with 11 ml of cyclohexyldimethylamine and 30 ml of dimethylacetamide and degassed. 38 mg of palladium acetate and 152 mg of di(tert-butyl)phenylphosphine are dissolved in 5 ml of dimethylacetamide and added to the mixture. The mixture is transferred to an autoclave and 30 bar of ethylene are injected. The mixture is then heated to 110° C. and stirred at this temperature for 3 hours. At the end of the reaction, the mixture is cooled and the pressure released. Subsequently, 8.3 g of 1,5-dimethyl-3-trifluoromethyl-1H-pyrazole are added to the reaction mixture and the mixture is heated to 130° C. for 12 h. Afterwards, the mixture is cooled, added to water and worked up with toluene. Yield over the two steps: 10.5 g (76%) of slightly brownish solid.

Provenance & Evidence