Dimethylformamide dimethyl acetal → Ethyl 2-(2-chloro-6,7-difluoroquinoline-3-carbonyl)-3-dimethylaminoacrylate

Participants

Reaction Steps

A suspension of 6.17 g of ethyl 3-(2-chloro-6,7-difluoro-3-quinolyl)-3-oxopropionate in 7.15 g of N,N-dimethylformamide dimethyl acetal and 60 cm3 of ethyl acetate is heated at a temperature close to 75° C. for 1 hour 15 minutes. The reaction mixture is concentrated to dryness under reduced pressure (20 kPa) at about 50° C. The residue is taken up in 50 cm3 of diisopropyl ether, drained and washed with 3 times 25 cm3 of the same solvent. 6.65 g of ethyl 2-(2-chloro-6,7-difluoroquinoline-3-carbonyl)-3dimethylaminoacrylate are obtained in the form of an orange solid melting at 140° C.

Provenance & Evidence