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The general procedure for the synthesis of 6-chloro-3-iodoimidazo[1,2-b]pyridazine using 6-chloroimidazo[1,2-b]pyridazine as starting material was as follows: 6-chloroimidazo[1,2-b]pyridazine (2.0 g, 13.0 mmol, 1.0 equiv) was dissolved in chloroform (20 mL) at room temperature. Subsequently, iodosuccinimide (2.9 g, 13.0 mmol, 1.0 eq.) was added to this solution and the reaction mixture was vigorously stirred overnight at room temperature. After completion of the reaction, the mixture was diluted with water and extracted with ethyl acetate. The extract was purified by column chromatography, resulting in 3.3 g of yellow solid product in 90% yield. The structure of the product was confirmed by 1H NMR: δ 8.21 (d, J = 7.6 Hz, 1H), 7.96 (s, 1H), 7.41 (d, J = 7.6 Hz, 1H).

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