反应详情

A solution of 3.4 g (12.7 mmol) of 3-ethoxycarbonylmethyl-2,2-dimethyl-6-fluoro-chroman in 40 ml of absolute diethyl ether is added dropwise within a period of 30 minutes, while cooling with ice, to a suspension of 0.97 g (25.5 mmol) of lithium aluminium hydride in 30 ml of absolute diethyl ether. The reaction mixture is then stirred for 2 hours at room temperature and then carefully decomposed with 1 ml of water, 1 ml of sodium hydroxide solution (15%) and 3 ml of water. The resulting precipitate is filtered off with suction and the filtrate is dried over sodium sulfate and concentrated by evaporation in vacuo, yielding 2.75 g (96% of the theoretical yield) of 2,2-dimethyl-6-fluoro-3-(2-hydroxyethyl)-chroman in the form of a light-yellow oil.

1. filtrationThe resulting precipitate is filtered off with suction
2. dry with materialthe filtrate is dried over sodium sulfate
3. concentrationconcentrated by evaporation in vacuo
4. customyielding 2.75 g (96% of the