反应详情

A solution of 16.6 g of 1,4-benzodioxan-6-methanol in 20 ml of dimethylformamide is added dropwise with stirring to a suspension of 12.5 g of sodium hydride in 75 ml of dimethylformamide. 11.8 g of propargyl bromide are then added dropwise. The mixture is stirred for 3 hours at room temperature, cooled in an ice-bath, decomposed with 20 ml of ice-water, diluted with 150 ml of water and extracted three times with 150 ml of diethyl ether each time. The ether extract is washed with water, dried over sodium sulphate and evaporated. The oily residue is chromatographed on silica gel using benzene as the elution agent. There is obtained 6-[(2-propynyloxy)methyl]-1,4-benzodioxan; nD24 = 1.5487.

1. temperaturecooled in an ice-bath
2. extractionextracted three times with 150 ml of diethyl ether each time
3. extractionThe ether extract
4. washis washed with water
5. dry with materialdried over sodium sulphate
6. customevaporated
7. customThe oily residue is chromatographed on silica gel