Ethyl 2-methylacetoacetate → HCID 178422302, compound

Participants

Reaction Steps

A solution of 1.78 g of 4-(4-trifluoromethoxyphenoxy)-3,5-dimethylaniline, 1.92 g of ethyl 2-methylacetoacetate, and 1.14 g of p-toluenesulfonic acid dissolved in 61 mL of xylene was heated under reflux for 9 hr. This reaction solution was cooled, and the precipitated crystals were then collected by filtration and were washed with distilled water and n-hexane to give 2.94 g of 6-(4-trifluoromethoxyphenoxy)-4-hydroxy-2,3,5,7-tetramethyl-quinoline 2.26 g (yield 100%). A 1.14 g portion in the crystals thus obtained was stirred in 15 mL of acetic anhydride with heating at 120 to 125° C. for 2 hr. The reaction solution was concentrated, ethyl acetate was then added to the concentrate, the mixture was washed with saturated brine, and the solvent was then 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) to give 0.74 g of 4-acetoxy-6-(4-trifluoromethoxyphenoxy)-2,3,5,7-tetramethyl-quinoline (yield 58.4%).

Provenance & Evidence