反应详情

69.8 g of 5-cyano-6-methyl-2-[[3-(trifluormethyl)phenyl]amino]-3-pyridine-carboxylic acid, ethyl ester (0.2 mol) are dissolved in 400 ml of diethyleneglycoldimethyl ether. After addition of 24.2 g of selenium dioxide, the mixture is heated at 160° with stirring for 2 hrs. The selenium is filtered off and the filtrate evaporated. The resulting yellow title compound is recrystallized from butanol. Yield 56 g (77%); m.p. 183°-185° C.

1. temperaturethe mixture is heated at 160°
2. filtrationThe selenium is filtered off
3. customthe filtrate evaporated
4. customThe resulting yellow title compound is recrystallized from butanol