反应详情

温度

100 °C

To a 10 ml acetonitrile solution of 426 mg of 4,4′-difluorobenzophenone and 841 mg of piperazine, 395 mg of triethylamine was added and stirred at 100° C. for 12 hours. After cooling to room temperature, saturated aqueous sodium hydrogenbicarbonate solution was added, followed by extracting with chloroform. The extract was dried, filtered and concentrated under reduced pressure. The residue obtained was dissolved in 5 ml of trifluoroacetic acid and treated with 520 mg of triethylsilane and 60 mg of concentrated sulfuric acid, and stirred at room temperature for 1 hour. The reaction, mixture was adjusted to pH=9 to 11 with 10% aqueous sodium hydroxide solution, followed by extracting with ethyl acetate. The extract was dried, filtered and concentrated under reduced pressure to give a residue, which was purified by silica gel column chromatography (chloroform:methanol:water (2% acetic acid)=65:35:5) to give the above-referenced compound, 1-[4-(4-fluorophenyl)methylphenyl]piperazine in an amount of 305 mg (yield 58%).

1. temperatureAfter cooling to room temperature
2. extractionby extracting with chloroform
3. customThe extract was dried
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue obtained
7. stirringstirred at room temperature for 1 hour
8. customThe reaction, mixture
9. extractionby extracting with ethyl acetate
10. customThe extract was dried
11. filtrationfiltered
12. concentrationconcentrated under reduced pressure
13. customto give a residue, which
14. customwas purified by silica gel column chromatography (chloroform:methanol:water (2% acetic acid)=65:35:5)