反应详情

A mixture of 14.703 g (35.2 mM) of 5-n-hexadecyloxymethyl-2-phenyl-1,3-dioxane n2, 6.90 g (38.4 mM) of N-bromosuccinimide and 700 mg of barium carbonate in 200 ml of dichloromethane is heated under refluxing for 1 hour. After cooling, the mixture is poured into an ice cooled saturated aqueous sodium bicarbonate and the product is isolated by dichloromethane extraction. The dichloromethane layer is washed with 10% aqueous sodium thiosulfate and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate and evaporated. Purification of the residue by column silica gel chromatography using n-hexane-ethyl acetate (9:1) mixture as an eluent affords 13.843 g (79.3% yield) of the titled compound n3.

1. temperatureis heated
2. temperatureunder refluxing for 1 hour
3. temperatureAfter cooling
4. washThe dichloromethane layer is washed with 10% aqueous sodium thiosulfate and saturated aqueous sodium chloride
5. dry with materialdried over anhydrous magnesium sulfate
6. customevaporated
7. customPurification of the residue by column silica gel chromatography