反应详情

3.36 g of (-)-cis-2-(4-methoxyphenyl)-3-hydroxy-8-chloro-2,3-dihydro-1,5-benzothiazepin-4(5H)-one are dissolved in 10 ml of pyridine, and 0.87 g of acetyl chloride is added dropwise thereto under ice-cooling. The mixture is stirred at room temperature for one hour. Then, the mixture is diluted by addition of chloroform. The diluted mixture is washed with 10% hydrochloric acid and water, and then evaporated under reduced pressure to remove solvent. The residue is recrystallized from a mixture of ether and n-hexane, whereby 3.37 g of (-)-cis-2-(4-methoxyphenyl)-3-acetoxy-8-chloro-2,3-dihydro-1,5-benzothiazepin-4(5H)-one is obtained as needles.

1. temperatureunder ice-cooling
2. washThe diluted mixture is washed with 10% hydrochloric acid and water
3. customevaporated under reduced pressure
4. customto remove solvent
5. customThe residue is recrystallized from a mixture of ether and n-hexane