Sodium Carbonate → 3-ethoxycarbonyl-6,7-difluoro-2-(N-methyl-N-beta-cyanoethylamino)quinoline

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19.08 g of sodium carbonate are added to a solution of 16.3 g of 2-chloro-3-ethoxycarbonyl-6,7-difluoroquinoline, prepared as described in Application Example 1, and 10 g of N-methyl-N-(b-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-(b-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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