反应详情

368 mg (corresponding to 1.1 mmol) of 2-(4′-hydroxyphenyl)-6-iodoimidazo[1,2-a]pyridine that was sufficiently dried to remove moisture was dissolved in 15 mL of N,N-dimethylformamide, and 453 mg (corresponding to 3.3 mmol) of potassium carbonate was added thereto. The mixture was supplemented with 280 μL (corresponding to 1.6 mmol) of 2-fluoroethyl-p-toluenesulfonate, and then the solution was stirred at room temperature for 22 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: hexane/ethyl acetate=1/1), 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 222 mg (corresponding to 0.580 mmol) of 2-[4′-(2″-fluoroethoxy)phenyl]-6-iodoimidazo[1,2-a]pyridine (FIG. 1-7, Step 3).

1. customto remove moisture
2. dissolutionwas dissolved in 15 mL of N,N-dimethylformamide
3. customAfter the completion of the reaction
4. extractionextracted three times with chloroform
5. washThe combined chloroform layer was washed with water
6. dry with materiala saturated sodium chloride solution, dried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. customThe resulting crude product was purified by flash silica gel column chromatography (elution solvent: hexane/ethyl acetate=1/1)