反应详情

To a solution (5 mL) of the compound (1.2 g, 4.6 mmol) obtained in Example 190b in tetrahydrofuran was added oxalyl chloride (0.68 mL, 9.3 mmol), and the mixture was stirred at room temperature overnight. The reaction mixture was neutralized with saturated aqueous sodium hydrogen carbonate, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. To a solution (20 mL) of the residue in acetone was added sodium iodide (2.1 g, 14 mmol), and the mixture was stirred at 70° C. for 3 hr. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The obtained crude product was purified by column chromatography (hexane-hexane/ethyl acetate=90/10) to give the title compound (530 mg, 31% in 2 steps) as colorless crystals.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe obtained organic layer was washed with saturated brine
3. dry with materialdried over anhydrous sodium sulfate
4. customThe solvent was evaporated under reduced pressure
5. stirringthe mixture was stirred at 70° C. for 3 hr
6. extractionthe mixture was extracted with ethyl acetate
7. washThe obtained organic layer was washed with saturated brine
8. dry with materialdried over anhydrous sodium sulfate
9. customThe solvent was evaporated under reduced pressure
10. customThe obtained crude product
11. customwas purified by column chromatography (hexane-hexane/ethyl acetate=90/10)