反应详情

A mixture of 6.72 g of (±)-cis-2-(4-methoxyphenyl)-3-hydroxy-8-chloro-2,3-dihydro-1,5-benzothiazepin-4(5H)-one, 2.58 g of potassium hydroxide and 90 ml of dimethylsulfoxide is stirred at room temperature for one hour. Then, 3.16 g of 2-(dimethylamino)ethyl chloride hydrochloride are added to the mixture, and said mixture is stirred at room temperature for 16 hours. The reaction mixture is poured into ice-water, and the precipitated crystals are collected by filtration and washed with water. The crystals are dissolved in concentrated hydrochloric acid, and the solution is washed with ethyl acetate and then alkalized with potassium carbonate. Then, the solution is extracted with chloroform. The extract is washed with water, dried and then evaporated to remove solvent. The residue is converted to its hydrochloride and then recrystallized from ethanol. 6.65 g of (±)-cis-2-(4-methoxyphenyl)-3-hydroxy-5-[2-(dimethylamino)ethyl]-8-chloro-2,3-dihydro-1,5-benzothiazepin-4(5H)-one hydrochloride are thereby obtained. Recrystallization of the product from a mixture of chloroform, ethanol and ether gives crystals (prisms) melting at 136°-139° C.

1. stirringis stirred at room temperature for 16 hours
2. filtrationthe precipitated crystals are collected by filtration
3. washwashed with water
4. dissolutionThe crystals are dissolved in concentrated hydrochloric acid
5. washthe solution is washed with ethyl acetate
6. extractionThen, the solution is extracted with chloroform
7. washThe extract is washed with water
8. customdried
9. customevaporated
10. customto remove solvent
11. customrecrystallized from ethanol