反应详情

A stirred solution of 2.5 grams (0.009 mole) of (2-chlorophenyl)(4-chlorophenyl)methyl chloride, 1.6 grams (0.010 mole) of ethyl 1-piperazine-carboxylate, 1.4 mL (0.010 mole) of triethylamine, and 1.2 grams (0.008 mole) of sodium iodide in 25 mL of toluene was heated at reflux for about 18 hours. The resulting precipitate was collected by filtration. The filtrate was cooled to ambient temperature and 200 mL of aqueous saturated sodium bicarbonate solution was added to it. The mixture was extracted with two 100 mL portions of ethyl acetate. The combined ethyl acetate layers were washed with two 25 mL portions of an aqueous saturated sodium chloride solution. The organic layer was dried with sodium sulfate and concentrated under reduced pressure, yielding 3.2 grams of crude material. The crude material was subjected to column chromatography on silica gel with 50-25% hexane in methylene chloride, followed by pure methylene chloride, as eluants. The product-containing fractions were combined and concentrated under reduced pressure, yielding 1.0 gram of N-(ethoxycarbonyl)-N′-[(2-chlorophenyl)(4-chlorophenyl)methyl]piperazine. The NMR spectrum was consistent with the proposed structure.

1. temperatureat reflux for about 18 hours
2. filtrationThe resulting precipitate was collected by filtration
3. addition200 mL of aqueous saturated sodium bicarbonate solution was added to it
4. extractionThe mixture was extracted with two 100 mL portions of ethyl acetate
5. washThe combined ethyl acetate layers were washed with two 25 mL portions of an aqueous saturated sodium chloride solution
6. dry with materialThe organic layer was dried with sodium sulfate
7. concentrationconcentrated under reduced pressure
8. customyielding 3.2 grams of crude material
9. concentrationconcentrated under reduced pressure