Potassium Iodide → 5-Iodo-1,2,3,4-tetrahydro-1,8-naphthyridine

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A mixture of 3-(3-chloropropyl)-2-fluoro-4-iodopyridine (5.0 g, 17 mmol), NH4OH (100 mL, 800 mmol), ammonium acetate (18 g, 230 mmol), potassium iodide (5.5 g, 33 mmol), potassium carbonate (12 g, 87 mmol) and DMF (26 mL) was heated at 60° C. for 8 h. The mixture allowed to cool, and diluted with EtOAc. The layers were separated and the organic layer was washed with brine, dried with MgSO4, then concentrated under reduced pressure. The residue was purified by column chromatography on silica gel using CombiFlash® apparatus, eluting with 0 to 50% EtOAc in hexanes, to give the sub-title compound (3.0 g, 69% yield). LCMS calc. for C8H10IN2(M+H)+: m/z=261.0. Found: 261.1.

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