[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([NH2:8])=[N:6][CH:7]=1.[I:9]N1C(=O)CCC1=O.C(=O)([O-])O.[Na+]>C(O)(=O)C>[Cl:1][C:2]1[CH:3]=[C:4]([I:9])[C:5]([NH2:8])=[N:6][CH:7]=1A mixture of 6.43 g of 5-chloropyridin-2-ylamine and 12.38 g of N-iodosuccinimide in 300 ml of glacial acetic acid is heated at around 55° C. for 6 hours. After returning to a temperature of approximately 20° C., the mixture is agitated for approximately 18 hours and then concentrated to dryness under reduced pressure (13 kPa). The residue is taken up with 400 ml of water; the pH of the suspension obtained is brought back to approximately 8 by adding a saturated aqueous sodium hydrogen carbonate solution. The precipitate is filter-dried, washed with water, and dried at 40° C. under reduced pressure (13 kPa) for approximately 3 hours. 12.35 g of 5-chloro-3-iodopyridin-2-ylamine are obtained in the form of a solid, the characteristics of which are as follows:
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