反应详情

0.14 ml (2.0 mmol) of 2-bromoethanol and 0.17 ml (2.4 mmol) of acetyl chloride were dissolved in 2 ml of dichloromethane. 0.28 ml (2.0 mmol) of triethylamine was added, and the reaction mixture was stirred at room temperature. After 1 h 50 ml of dichloromethane was added to the reaction mixture, which was then washed with a sodium bicarbonate (sat.) solution, a 10% citric acid solution and water. The organic phase was dried over sodium sulfate and evaporated to obtain 0.241 g (72%) of 2-bromoethylacetate. Following the procedure outlined in Step 1 of Example 1, but substituting 2-bromoethylacetate for methyl iodide, afforded 2-[4-(4-nitrophenyl)piperazin-1-yl]ethylacetate (64%), which was reduced according to the procedure of Step 2 in Example 1 to give the corresponding amine 2-[4-(4-aminophenyl)piperazin-1-yl]ethylacetate in quantitative yield. 2-[4-(4-aminophenyl)piperazin-1-yl]ethylacetate was reacted with 9-chloro-1,2,3,4-tetrahydroacridine (according to the procedure of Step 4 in Example 1) to obtain 2-{4-[4-amino-(1,2,3,4-tetrahydroacridin-9-yl)phenyl]piperazin-1-yl}ethyl acetate with 47% yield. Treating the ester with 4 equivalents of lithium hydroxide in a dioxane/water solution overnight, afforded the title compound with 60% yield (overall yield 20%).