[Cl:1][C:2]1[CH:7]=[C:6]([NH2:8])[CH:5]=[CH:4][N:3]=1.C(=O)([O-])[O-].[Na+].[Na+].[I-:15].[K+].II.[OH-].[Na+].S([O-])([O-])(=O)=S.[Na+].[Na+]>O>[Cl:1][C:2]1[C:7]([I:15])=[C:6]([NH2:8])[CH:5]=[CH:4][N:3]=1Commercially available 2-chloro-4-aminopyridine (15 g, 0.1 mol) and 37.2 g (0.4 mol) of sodium carbonate are suspended in 200 ml of water and warmed to 100° C. 58.3 g (0.4 mol) of potassium iodide and 59.4 g (0.2 mol) of iodine are added to the resultant solution, and the mixture is stirred at the temperature indicated for 12 h. The mixture is subsequently adjusted to pH 13 using sodium hydroxide solution, treated with sodium thiosulfate until completely decolorised and extracted with ethyl acetate. Chromatographic purification gives 5 g (17%) of solid.
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