反应详情

To a solution of 2,2-dimethyl-1-[4-(6-nitro-pyridin-3-yl)-piperazin-1-yl]-propan-1-one (1.0 g, 3.42 mmol) in THF (10 mL) was added BH3.DMS (0.6 mL, 6.84 mmol) at r.t. and the reaction was then heated to reflux for 6 h. The reaction was cooled, quenched with ammonium chloride solution and extracted with ethyl acetate. The combined organic layers were washed with brine solution, dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. The crude material was purified by column chromatography over silica gel (60-120 mesh) using 20% ethyl acetate/petroleum ether as eluent to afford 1-(2,2-dimethyl-propyl)-4-(6-nitro-pyridin-3-yl)-piperazine (0.5 g, 52.5%).

1. temperatureto reflux for 6 h
2. temperatureThe reaction was cooled
3. customquenched with ammonium chloride solution
4. extractionextracted with ethyl acetate
5. washThe combined organic layers were washed with brine solution
6. dry with materialdried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under vacuum
9. customThe crude material was purified by column chromatography over silica gel (60-120 mesh)