反应详情

温度

90 °C

A suspension of zinc powder (553 mg, 8.46 mmol) and calcium chloride (16 mg, 0.144 mmol) in ethanol (2.6 mL)-water (0.6 mL) was warmed to 90° C. followed by the addition of a solution of tert-butyl 4-[2-(3-nitrophenoxymethyl)pyridin-5-yl]piperidine-1-carboxylate (Example 30) (97 mg, 0.23 mmol) in ethanol (2 mL). The mixture was stirred at 90° C. for 1.5 hours, allowed to cool to room temperature and filtered through Celite pad. The filtrate was extracted with ethyl acetate. The organic layer was washed sequentially with water and brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (chloroform/methanol=100/1→100/2) to give the title compound (84 mg, yield 94%).

1. temperatureto cool to room temperature
2. filtrationfiltered through Celite pad
3. extractionThe filtrate was extracted with ethyl acetate
4. washThe organic layer was washed sequentially with water and brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (chloroform/methanol=100/1→100/2)