反应详情

A solution of tetrahydropyran-4-carboxaldehyde (16.0 g, 0.14 mol) in tetrahydrofuran (60 ml) is added dropwise over 1 hour to a 1 M solution of 3,5-dimethoxyphenylmagnesium chloride in tetrahydrofuran (140 ml), maintaining the reaction at or below reflux by external cooling. Once the addition is complete, and the exotherm has subsided, the reaction mixture is allowed to stir at room temperature overnight. A solution of dilute aqueous hydrochloric acid (300 ml) is added carefully and the reaction mixture is extracted with ethyl acetate. The organic extract is dried over anhydrous magnesium sulfate, filtered, and the filtrate evaporated in vacuo. Purification by column chromatography on silica gel gives (3,5-dimethoxyphenyl) (tetrahydropyran-4-yl)methanol as a cream solid.

1. temperaturemaintaining
2. customthe reaction at or
3. temperaturebelow reflux by external cooling
4. additionOnce the addition
5. extractionthe reaction mixture is extracted with ethyl acetate
6. extractionThe organic extract
7. dry with materialis dried over anhydrous magnesium sulfate
8. filtrationfiltered
9. customthe filtrate evaporated in vacuo
10. customPurification by column chromatography on silica gel