反应详情

2-Amino-4,5-bis-(2-methoxy-ethoxy)-benzoic acid ethyl ester (compound A) (2.5 g) produced by the above process was dissolved in anhydrous methylene chloride (40 ml). Pyridine (1.4 ml) and 3-(chloromethyl)-benzoyl chloride (compound B) (1.3 ml) were added dropwise to the solution at 0° C., and the mixture was stirred at room temperature for 30 min. After the completion of the reaction, distilled water was added thereto at room temperature, and the mixture was then 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 using a hexane-acetone system to give 2-(3-chloromethylbenzoylamino)-4,5-bis-(2-methoxy-ethoxy)-benzoic acid ethyl ester (2.3 g, yield 62%).

1. customAfter the completion of the reaction
2. distillationdistilled water
3. additionwas added
4. extractionat room temperature, and the mixture was then 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