反应详情

A solution of 1.18 g of 3,5-dimethyl-4-(3-(4-trifluoromethylphenoxy)propoxy)aniline, 1.35 g of methyl 2-methyl-3-oxopentanoate, and 0.7 g of p-toluenesulfonic acid dissolved in 38 mL of xylene was heated under reflux for 7 hr. This reaction solution was cooled, and ethyl acetate and sodium bicarbonate water were added thereto, followed by separation. The ethyl acetate layer was washed with brine and was further concentrated under the reduced pressure to give 1.38 g of 2-ethyl-4-hydroxy-3,5,7-trimethyl-6-(3-(4-trifluoromethylphenoxy)propoxy)quinoline. Next, 1.38 g of the product thus obtained was added to 15 mL of dimethylacetamide, and 0.26 g of 60% sodium hydride and 0.6 g of methyl chloroformate were added thereto at room temperature. The reaction solution was stirred at room temperature for 2 hr, and ethyl acetate and distilled water were then added thereto. The organic layer was washed with brine and was concentrated under the reduced pressure. The crude product was purified by column chromatography on silica gel (BW300, manufactured by Fuji Sylysia Chemical Ltd., solvent: n-hexane/ethyl acetate) and was then recrystallized from n-hexane /ethyl acetate to give 1.13 g of 4-methoxycarbonyloxy-2-ethyl-3,5,7-trimethyl-6-(3-(4-trifluoromethylphenoxy)propoxy)quinoline (yield 72.2%).

1. temperaturewas heated
2. temperatureunder reflux for 7 hr
3. temperatureThis reaction solution was cooled
4. customfollowed by separation
5. washThe ethyl acetate layer was washed with brine
6. concentrationwas further concentrated under the reduced pressure