反应详情

To a stirred solution of ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-hydroxyhexanoate (1.0 g) in pyridine (10 ml) is added dropwise methanesulfonyl chloride (0.92 g) at ice-bath temperature. After stirring for 1 hour at ice-bath temperature, the mixture is stirred for 30 minutes at room temperature, and then cooled. After addition of water (1 ml), the mixture is stirred for 30 minutes at ice-bath temperature, and ice bath is removed. The mixture is stirred for 30 minutes at room temperature, diluted with water (50 ml) and extracted with ethyl acetate (50 ml). The extract is washed successively with 10% hydrochloric acid, water, 0.1N sodium hydroxide solution and water, dried over anhydrous magnesium sulfate and evaporated in vacuo to yield ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-methanesulfonyloxyhexanoate (1.1 g) as a colorless oil.

1. stirringthe mixture is stirred for 30 minutes at room temperature
2. temperaturecooled
3. stirringthe mixture is stirred for 30 minutes at ice-bath temperature, and ice bath
4. customis removed
5. stirringThe mixture is stirred for 30 minutes at room temperature
6. additiondiluted with water (50 ml)
7. extractionextracted with ethyl acetate (50 ml)
8. washThe extract is washed successively with 10% hydrochloric acid, water, 0.1N sodium hydroxide solution and water
9. dry with materialdried over anhydrous magnesium sulfate
10. customevaporated in vacuo