[Cl:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8]Cl)=[CH:4][C:3]=1[F:10].[F:11][CH:12]([F:15])[CH2:13][NH2:14].C(N(CC)CC)C>C(#N)C.Cl>[Cl:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][NH:14][CH2:13][CH:12]([F:15])[F:11])=[CH:4][C:3]=1[F:10]At 45° C., 520 mg (2.89 mmol) of 6-chloro-3-chloromethyl-5-fluoropyridine (VII-3), 1.05 ml (14.44 mmol) of 2,2-difluoroethylamine and 400 μL (2.89 mmol) of triethylamine are stirred in 50 ml of acetonitrile for about 48 hours. After about 16 and 32 hours, in each case another 0.42 ml (5.78 mmol) of 2,2-difluoroethylamine are added. After concentration of the reaction mixture under reduced pressure, the residue is taken up in 1 N aqueous hydrochloric acid and the mixture is washed with ethyl acetate. The aqueous phase is made alkaline using 2.5 N aqueous sodium hydroxide solution and extracted repeatedly with ethyl acetate. The combined organic phase is dried over sodium sulphate and concentrated under reduced pressure, giving 370 mg (57% of theory) of N-[(6-chloro-5-fluoropyridin-3-yl)methyl]-2,2-difluoroethylamine.
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