反应详情

Subsequently, crude 2-amino-5-piperidin-1-yl-benzoic acid ethyl ester (compound A) (1.3 g) was dissolved in anhydrous methylene chloride (100 ml). Triethylamine (5.6 ml) and 3,4-dimethoxy-benzoyl chloride (compound B) (1.8 g) were added at 0° C., and the mixture was stirred at room temperature for 24 hr. After the completion of the reaction, distilled water was added thereto at room temperature, and the mixture was subjected to separatory extraction with chloroform. The organic layer was washed with saturated brine, was dried over sodium sulfate, and was then concentrated under the reduced pressure. The residue was purified by column chromatography eluted with a hexane-chloroform system to give 2-(3,4-dimethoxy-benzoylamino)-5-piperidin-1-yl-benzoic acid ethyl ester (960 mg, yield 52%).

1. customAfter the completion of the reaction
2. distillationdistilled water
3. additionwas added
4. extractionat room temperature, and the mixture was subjected to separatory extraction with chloroform
5. washThe organic layer was washed with saturated brine
6. dry with materialwas dried over sodium sulfate
7. concentrationwas then concentrated under the reduced pressure
8. customThe residue was purified by column chromatography
9. washeluted with a hexane-chloroform system