[S:1]1[C:9]2[C:4](=[N:5][CH:6]=[CH:7][C:8]=2[OH:10])[CH:3]=[CH:2]1.[I:11]N1C(=O)CCC1=O>C(#N)C>[I:11][C:7]1[C:8]([OH:10])=[C:9]2[S:1][CH:2]=[CH:3][C:4]2=[N:5][CH:6]=1A mixture of thieno[3,2-b]pyridin-7-ol (from Aldrich) (0.54 g, 3.6 mmol) and N-iodosuccinimide (0.88 g, 3.9 mmol) in acetonitrile (10 mL) was heated at reflux overnight. The mixture was concentrated under reduced pressure to give the desired product which was used in the next step without further purification. LCMS calculated for C7H5INOS (M+H)+: m/z=277.9. Found: 277.8.
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