[CH2:1]([N:8]1[C:13](=[O:14])[C:12](Cl)=[C:11](Cl)[CH:10]=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.ClCCl.S([O-])([O-])(=O)=S.[Na+].[Na+].[IH:27]>>[CH2:1]([N:8]1[C:13](=[O:14])[CH:12]=[C:11]([I:27])[CH:10]=[N:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=12-Benzyl-4,5-dichloropyridazin-3(2H)-one (32.3 g, 127 mmol) was dissolved in hydriodic acid (223 mL) and the mixture was refluxed at 115° C. overnight. The mixture was poured into dichloromethane and 30% sodium thiosulphate (250 mL), and extracted with dichloromethane (3×250 mL). The combined organics were washed with 30% sodium thiosulphate several times (total 1 L), dried (sodium sulfate), and concentrated. Dichloromethane was added to the residue and the precipitate was collected by filtration to afford the title compound. 1H NMR (500 MHz, CD3SOCD3) δ 8.17 (s, 1H); 7.61 (s, 1H); 7.23-7.33 (m, 5H); 5.17 (s, 2H). LRMS (APCI) calc'd for (C11H10IN2O) [M+H]+, 313.0. found 313.0.
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