反应详情

A 2.5 M solution of n-butyllithium in hexane (14.7 mL, 36.73 mmol) was added to a solution of 4-[1-ethyl-1-(4-ethynyl-3-methyl-phenyl)-propyl]-2-methyl-phenol (Example 1-(3); 4.28 g, 14.69 mmol) in tetrahydrofuran (92 mL) at −78° C. Pentan-3-one (4.85 mL, 44.07 mmol) was added to the mixture at −78° C., and the mixture was stirred at the same temperature for three hours and concentrated under reduced pressure. Ethyl acetate and water were added to the residue, and a 1 N hydrochloric acid aqueous solution was added to adjust the pH to about 7. The organic layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by a silica gel column (hexane/ethyl acetate=6/1) to give the title compound (3.66 g, 62%).

1. concentrationconcentrated under reduced pressure
2. additionEthyl acetate and water were added to the residue
3. additiona 1 N hydrochloric acid aqueous solution was added
4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by a silica gel column (hexane/ethyl acetate=6/1)