Dimethylformamide dimethyl acetal → Ethyl 2-(2-chloro-6,7,8-trifluoro-3-quinolinecarbonyl)(dimethylamino)acrylate

Participants

Reaction Steps

A suspension of 26.7 g of ethyl 3-(2-chloro-6,7,8-trifluoro-3-quinolyl)-3-oxopropionate in 270 cm3 of ethyl acetate and 32 cm3 of N,N-dimethylformamide dimethyl acetal is heated at a temperature close to 75° C., with stirring, for 2 hours. The reaction mixture is concentrated to dryness under reduced pressure (20 kPa) at about 50° C. The dry extract is taken up in 175 cm3 of diisopropyl ether, drained and washed with twice 85 cm3 of the same solvent. 19.32 g of ethyl 2-(2-chloro-6,7,8-trifluoroquinoline-3-carbonyl)-3-dimethylaminoacrylate are obtained in the form of an orange solid melting at 118° C., which is used for the subsequent steps without further purification.

Provenance & Evidence