[Br:1][C:2]1[CH:3]=[C:4](Br)[C:5]2[N:6]([C:8]([I:11])=[CH:9][N:10]=2)[N:7]=1.[CH3:13][S-:14].[Na+].O>CN1C(=O)CCC1>[Br:1][C:2]1[CH:3]=[C:4]([S:14][CH3:13])[C:5]2[N:6]([C:8]([I:11])=[CH:9][N:10]=2)[N:7]=1To a stirred solution of 51.2 g (146.8 mmol) 6,8-dibromo-3-iodoimidazo[1,2-b]pyridazine which was prepared according to intermediate example 96c in NMP (450 mL) are added 12.35 g (176.2 mmol) sodium methanethiolate in one portion at 0° C. After reaction for 15 min, 700 mL water are added and the precipitate is filtered off and dried. Trituration with ether, filtration and drying in vaccuo. yields 44.3 g (65%) of the title compound
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