Dimethylformamide dimethyl acetal → Ethyl 2-(2-chloro-6,7,8-trifluoro-3-quinolinecarbonyl)(dimethylamino)acrylate
Reaction equation
[Cl:1][C:2]1[C:11]([C:12](=[O:19])[CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])=[CH:10][C:9]2[C:4](=[C:5]([F:22])[C:6]([F:21])=[C:7]([F:20])[CH:8]=2)[N:3]=1.CO[CH:25](OC)[N:26]([CH3:28])[CH3:27]>C(OCC)(=O)C>[Cl:1][C:2]1[C:11]([C:12]([C:13](=[CH:25][N:26]([CH3:28])[CH3:27])[C:14]([O:16][CH2:17][CH3:18])=[O:15])=[O:19])=[CH:10][C:9]2[C:4](=[C:5]([F:22])[C:6]([F:21])=[C:7]([F:20])[CH:8]=2)[N:3]=1Participants
4
Procedure
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.