反应详情

温度

-70 °C

To a solution of 19.39 g (75.4 mM) of 5-bromomethyl-2-phenyl-1,3-dioxane m2 in 200 ml of tetrahydrofuran is added 1.923 g (79.17 mM) of magnesium and the mixture is allowed to react for 7 hours under ultrasonic bibration. The mixture is cooled to -70° C. and 21.27 ml (377 mM) of acetaldehyde is added and then the mixture is stirred at 0° C. for 15 hours. The mixture is poured into an ice-cooled saturated aqueous ammonium chloride solution and the product is isolated by ethyl acetate extraction. The ethyl acetate layer is washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate and evaporated. By eliminating the polar impurity by passing short column of silica gel, 11.353 g of the crude titled compound m3 is obtained which is used to the next reaction without further purification.

1. customto react for 7 hours under ultrasonic bibration
2. washThe ethyl acetate layer is washed with saturated aqueous sodium chloride
3. dry with materialdried over anhydrous magnesium sulfate
4. customevaporated