Water → 2-[4'-(3''-Fluoropropoxy)phenyl]-6-iodoimidazo[1,2-a]pyridine

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Reaction Steps

673 mg (corresponding to 2.0 mmol) of 2-(4′-hydroxyphenyl)-6-iodoimidazo[1,2-a]pyridine that was sufficiently dried to remove moisture was dissolved in 25 mL of N,N-dimethylformamide, and 831 mg (corresponding to 6.0 mmol) of potassium carbonate was added thereto. The mixture was supplemented with 275 μL (corresponding to 3.0 mmol) of 1-bromo-3-fluoropropane, and then stirred at room temperature for 24 hours. After the completion of the reaction, the reaction solution was poured into water and extracted three times with chloroform. The combined chloroform layer was washed with water and a saturated sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated. The resulting crude product was purified by flash silica gel column chromatography (elution solvent: chloroform), and further by recycle preparative HPLC(HPLC apparatus: LC-908 (under trade name; manufactured by Japan Analytical Industry Co., Ltd.); column: two JAIGEL 2H (under trade name; manufactured by Japan Analytical Industry Co., Ltd.) connected together; mobile phase: chloroform), to obtain 349 mg (corresponding to 0.881 mmol) of 2-[4′-(3″-fluoropropoxy)phenyl]-6-iodoimidazo[1,2-a]pyridine (FIG. 1-5, Step 3).

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