反应详情

A mixture of 18 g of 5-(1-benzyloxycarbonyl-4-piperidy)pentanol and 150 ml of pyridine is stirred under ice-cooling, and 14.6 of tosyl chloride is added portionwise to the mixture over the period of 30 minutes. After stirring for another 1 hour under ice-cooling, 2 ml of ice-cold water is added dropwise. Ethyl acetate (500 ml) is added to the reaction solution, which is then washed with 500 ml of 2N-hydrochloric acid and 500 ml of 1N hydrochloric acid successively, further with dilute aqueous sodium hydrogencarbonate solution and water successively, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting oily material is purified by silica-gel column chromatography to give 18 g of 5-(1-benzyloxycarbonyl-4-piperidyl)pentyl p-toluenesulfonate as an oily material.

1. temperaturecooling
2. stirringAfter stirring for another 1 hour under ice-
3. temperaturecooling
4. washis then washed with 500 ml of 2N-hydrochloric acid and 500 ml of 1N hydrochloric acid successively
5. dry with materialfurther with dilute aqueous sodium hydrogencarbonate solution and water successively, dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe resulting oily material is purified by silica-gel column chromatography