反应详情

In tetrahydrofuran (100 ml) were dissolved 1-bromo-2-fluorobenzene (5.6 ml), ethyl bromide (0.37 ml) and 4-[(2R)-2-(3,4,5,6-tetrahydro-2H-pyran-2-yloxy)propionyl]morpholine (11.3 g). To the mixture was added magnesium (turnings, 1.33 g). The mixture was stirred for 2 hours at room temperature. To the reaction mixture were added a saturated aqueous ammonium chloride solution (40 ml) and water (40 ml). The mixture was extracted with ethyl acetate (200 ml). The organic layer was washed with water, dried over magnesium sulfate and distilled under reduced pressure. The residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=10:1→8:1) to give (2R)-2'-fluoro-2-(3,4,5,6-tetrahydro-2H-pyran-2-yloxy)propiophenone (8.7 g) as a pale yellow oily substance.

1. extractionThe mixture was extracted with ethyl acetate (200 ml)
2. washThe organic layer was washed with water
3. dry with materialdried over magnesium sulfate
4. distillationdistilled under reduced pressure
5. customThe residue was purified by silica gel column chromatography (eluent: hexane/ethyl acetate=10:1→8:1)