反应详情

A solution of 3.4 g of 4-(4-trifluoromethoxyphenoxy)-3-trifluoromethyl-aniline, 2.4 g of ethyl 2-methylacetoacetate, and 0.3 g of p-toluenesulfonic acid dissolved in 100 mL of xylene was heated under reflux for 36 hr. This reaction solution was cooled, and the precipitated crystals were collected by filtration to give 1.73 g of 2,3-dimethyl-4-hydroxy-6-(4-trifluoromethoxyphenoxy)-7-trifluoromethyl-quinoline. The filtrate was concentrated under the reduced pressure to give 2,3-dimethyl-4-hydroxy-6-(4-trifluoromethoxyphenoxy)-5-trifluoromethyl-quinoline. Acetic anhydride (40 mL) was added to 2,3-dimethyl-4-hydroxy-6-(4-trifluoromethoxyphenoxy)-5-trifluoromethyl-quinoline obtained from the filtrate, and the mixture was heated at 120 to 125° C. for one hr. This reaction solution was concentrated under the reduced pressure, ethyl acetate was then added to the concentrate, and the mixture was washed with brine. Thereafter, the solvent was removed under the reduced pressure, and the crude product was purified by column chromatography on silica gel (BW300, manufactured by Fuji Sylysia Chemical Ltd., solvent: n-hexane/ethyl acetate) to give 0.35 g of 4-acetoxy-2,3-dimethyl-6-(4-trifluoromethoxyphenoxy)-5-trifluoromethyl-quinoline.

1. temperaturewas heated
2. temperatureunder reflux for 36 hr
3. temperatureThis reaction solution was cooled
4. filtrationthe precipitated crystals were collected by filtration