Iodine → 2-Fluoro-3-iodo-5-methylpyridine

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반응 단계

A solution of 2-fluoro-5-methyl-pyridine (1.0 g, 9.000 mmol) in dry THF (10 mL) was added dropwise and the solution was stirred at this temp for 2 hours. A solution of iodine (2.284 g, 463.3 μL, 9.000 mmol) in THF (10 mL) was then added and the resultant mixture stirred for a further 1 hour at this temp before being quenched with water. The resulting mixture was partitioned between sodium thiosulfate solution and Et2O, organics separated and washed further with saturated NaCl. The combined organics were dried over Na2SO4, filtered and concentrated under reduced pressure to give a colourless oil. The resulting mixture was purified by column chromatography (30% EtOAc in hexanes, ˜200 mL silica) to give a colourless foam (1.409 g, 66% Yield).

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