反应详情

To a solution of 346 mg of 3,5-dichloroisonicotinonitrile and 959 mg of 1-(2-fluoro-5-trifluoromethylphenyl)-3-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]urea in 24 mL of dioxane are added 462 mg of NaHCO3 in 14.4 mL of water. 462 mg of tetrakis(triphenylphosphine)palladium are then added and the reaction is refluxed for 5 hours and then left overnight at 20° C. 20 mL of water are then added and the mixture is extracted with 2×60 mL of ethyl acetate. The organic phase is dried over magnesium sulfate and then concentrated under reduced pressure. The brown oil is purified on a prepacked Merck cartridge of 30 g of SiO2 15-40 μm (dichloromethane and then 99/1 dichloromethane/methanol). 290 mg of yellow crystals of 1-[4-(5-chloro-4-cyanopyrid-3-yl)phenyl]-3-(2-fluoro-5-trifluoromethylphenyl)urea are obtained.

1. temperaturethe reaction is refluxed for 5 hours
2. extractionthe mixture is extracted with 2×60 mL of ethyl acetate
3. dry with materialThe organic phase is dried over magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe brown oil is purified on a prepacked Merck cartridge of 30 g of SiO2 15-40 μm (dichloromethane