反应详情

1.2 g of (+)-cis-2-(4-methoxyphenyl)-3-hydroxy-5-[2-(dimethylamino)ethyl]-2,3-dihydro-1,5-benzothiazepin-4(5H)-one, 1.08 g of 3-methoxy-4-nitrobenzoic acid and 0.96 g of dicyclohexylcarbodiimide are dissolved in a mixture of 30 ml of methylene chloride and 8 ml of dimethylformamide under ice-cooling. A catalytic amount of 4-(dimethylamino)pyridine is added to the solution, and said mixture is stirred at room temperature overnight. After the reaction, the precipitates are removed by filtration. The filtrate is washed with an aqueous potassium carbonate solution and then with water, dried and evaporated to remove solvent. The residue is purified by silica gel chromatography (solvent, chloroform:methanol=20:0.3). 1.2 g of (+)-cis-2-(4-methoxyphenyl)-3-(3-methoxy-4-nitrobenzoyloxy)-5-[2-(dimethylamino)ethyl]-2,3-dihydro-1,5-benzothiazepin-4(5H)-one are thereby obtained as an oil. Yield: 67.4%.

1. temperaturecooling
2. customAfter the reaction
3. customthe precipitates are removed by filtration
4. washThe filtrate is washed with an aqueous potassium carbonate solution
5. dry with materialwith water, dried
6. customevaporated
7. customto remove solvent
8. customThe residue is purified by silica gel chromatography (solvent, chloroform:methanol=20:0.3)