反应详情

温度

0 °C

n-Butyllithium (2.71 M solution in hexane, 2.8 mL, 7.6 mmol) was added to a solution of 4-[1-ethyl-1-(4-ethynyl-3-methyl-phenyl)-propyl]-2-methyl-phenol (Example 1-(3); 1 g, 3.4 mmol) in tetrahydrofuran (17 mL) in a nitrogen atmosphere at 0° C. Then, a solution of 4-oxothiane (0.4 g, 3.4 mmol) in tetrahydrofuran (2 mL) was added to the reaction mixture, which was further stirred at 0° C. for 30 minutes. The reaction mixture was then poured into a saturated aqueous ammonium chloride solution, followed by extraction with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by silica gel chromatography (hexane:ethyl acetate=2:1) to give the target compound (1.04 g, 74%).

1. extractionfollowed by extraction with ethyl acetate
2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe resulting residue was purified by silica gel chromatography (hexane:ethyl acetate=2:1)