反应详情

A solution of triethylamine (0.11 ml, 0.79 mmol) in dichloromethane (2 ml) is added dropwise to a chilled (ice-bath) solution of 2-(2,4,6-trimethylphenyl)-5-(tetrahydrofuran-3-yl)cyclohexane-1,3-dione (prepared by a method analogous to that described in Example 2) and acetyl chloride (0.056 ml, 0.79 mmol) in dichloromethane (4.5 ml). Once the addition is complete the cooling bath is removed and the reaction mixture is stirred at room temperature overnight. The reaction mixture is diluted with dichloromethane (35 ml) and washed with saturated aqueous sodium bicarbonate solution (20 ml). The organic phase is dried over anhydrous magnesium sulphate, filtered and the filtrate is evaporated in vacuo. The residue is purified by column chromatography on silica gel, eluting with a mixture of ethyl acetate and hexane to give 3-oxo-5-(tetrahydrofuran-3-yl)-2-(2,4,6-trimethylphenyl)cyclohex-1-enyl acetate.

1. customprepared by a method analogous to
2. additionOnce the addition
3. customis removed
4. additionThe reaction mixture is diluted with dichloromethane (35 ml)
5. washwashed with saturated aqueous sodium bicarbonate solution (20 ml)
6. dry with materialThe organic phase is dried over anhydrous magnesium sulphate
7. filtrationfiltered
8. customthe filtrate is evaporated in vacuo
9. customThe residue is purified by column chromatography on silica gel
10. washeluting with a mixture of ethyl acetate and hexane