反应详情

温度

55 °C

2-(2,4-Difluorophenyl)-2-[(1R)-1-(3,4,5,6-tetrahydro-2H-pyran-2-yl)oxyethyl]oxirane (82 g) (synthesized by the method disclosed in Japanese Unexamined Patent Publication No. Hei 4(1992)-74168) and pyridinium p-toluenesulfonate (6.3 g) were dissolved in ethanol (600 ml), and the resultant was stirred at 55° C. for 1 hour and concentrated under reduced pressure. The residue was dissolved in ethyl acetate (1 lit.) and washed with water (200 ml×2). The aqueous layer was extracted with ethyl acetate (100 ml×2). The combined organic layers were washed with a saturated aqueous solution of sodium chloride, dried over magnesium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by silica gel chromatography (eluent: hexane/ethyl acetate=10/1 to 8/1 to 3/1) to give (1R)-1-[2-(2,4-difluorophenyl)-2-oxiranyl]ethanol (31.5 g) as a pale yellow oily substance.

1. concentrationconcentrated under reduced pressure
2. dissolutionThe residue was dissolved in ethyl acetate (1 lit.)
3. washwashed with water (200 ml×2)
4. extractionThe aqueous layer was extracted with ethyl acetate (100 ml×2)
5. washThe combined organic layers were washed with a saturated aqueous solution of sodium chloride
6. dry with materialdried over magnesium sulfate
7. distillationdistilled under reduced pressure
8. customto remove the solvent
9. customThe residue was purified by silica gel chromatography (eluent: hexane/ethyl acetate=10/1 to 8/1 to 3/1)