Ethyl 2-methylacetoacetate → HCID 178432194, compound

Participants

Reaction Steps

A solution of 2.7 g of 3-chloro-4-(4-chlorobenzoyl)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 31 hr. This reaction solution was cooled, and the precipitated crystals were collected by filtration and were washed with n-hexane to give 2.68 g of a mixture of 5-chloro-6-(4-chlorobenzoyl)-4-hydroxy-2,3-dimethyl-quinoline with 7-chloro-6-(4-chlorobenzoyl)-4-hydroxy-2,3-dimethyl-quinoline (yield 77%). The crystals of the mixture thus obtained were stirred in 40 mL of acetic anhydride with heating at 120 to 125° C. for one hr. The reaction solution was concentrated, and the crude product was then purified by column chromatography on silica gel (BW300, manufactured by Fuji Sylysia Chemical Ltd., solvent: n-hexane/ethyl acetate) to give 1.0 g of 4-acetoxy-5-chloro-6-(4-chlorobenzoyl)-2,3-dimethyl-quinoline (yield 32.6%) and 0.47 g of 4-acetoxy-7-chloro-6-(4-chlorobenzoyl)-2,3-dimethyl-quinoline (yield 15.6%).

Provenance & Evidence