反应详情

4,5-(Dimethylmethylenedioxy)-3-hydroxy-6-heptenenitrile (3.54 g) was dissolved in 50 ml of methylene chloride under a nitrogen atmosphere, and a catalytic amount of pyridinium p-toluenesulfonate was added under ice cooling, followed by adding dropwise 2.57 ml of ethyl vinyl ether. After stirring for 2 hours, the reaction mixture was poured into a saturated sodium hydrogen aqueous solution, and extracted with diethyl ether. The organic layer was washed with a saturated sodium chloride aqueous solution. The obtained organic layer was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography to provide 4.41 g of 4,5-(dimethylmethylenedioxy)-3-(1-ethoxyethoxy)-6-heptenenitrile having the following properties (yield 91%).

1. extractionextracted with diethyl ether
2. washThe organic layer was washed with a saturated sodium chloride aqueous solution
3. dry with materialThe obtained organic layer was dried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe resulting residue was purified by silica gel column chromatography