C(=O)([O-])[O-].[Na+].[Na+].Cl[C:8]1[C:17]([C:18]([O:20][CH2:21][CH3:22])=[O:19])=[CH:16][C:15]2[C:10](=[CH:11][C:12]([F:24])=[C:13]([F:23])[CH:14]=2)[N:9]=1.[CH3:25][NH:26][CH2:27][CH2:28][C:29]#[N:30]>C1(C)C=CC=CC=1>[CH2:21]([O:20][C:18]([C:17]1[C:8]([N:26]([CH3:25])[CH2:27][CH2:28][C:29]#[N:30])=[N:9][C:10]2[C:15]([CH:16]=1)=[CH:14][C:13]([F:23])=[C:12]([F:24])[CH:11]=2)=[O:19])[CH3:22]19.08 g of sodium carbonate are added to a solution of 16.3 g of 2-chloro-3-ethoxycarbonyl-6,7-difluoroquinoline and 10 g of N-methyl-N-(β-cyanoethyl)amine in 160 cm3 of toluene. The suspension obtained is heated to reflux and then stirred for 4 hours at this temperature. The reaction mixture is then cooled to approximately 20° C. and thereafter washed with 3 times 50 cm3 of water. The organic phase is concentrated to dryness under reduced pressure (20 kPa) at approximately 50° C. 19.17 g of 3-ethoxycarbonyl-6,7-difluoro-2-[N-methyl-N-(β-cyanoethyl)amino]quinoline are obtained in the form of an oil, which is used without further purification for the subsequent steps.
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