反应详情

温度

-78 °C

To a −78° C. solution of 1-benzyl-3-methyl-piperidin-4-one (4.06 g, 20 mmol) in anhydrous THF (20 mL) was added lithium hexamethyldisilazide (21 mL, 21 mmol of a 1.0 M solution THF). After being stirred at −78° C. for 30 min, a solution of iodomethane (1.31 mL, 21 mmol) in THF (5 mL) was added into the reaction mixture. The resultant solution was stirred at 25° C. for 2 h and quenched with water. The aqueous layer was extracted with CH2Cl2. The organic extracts were combined, washed with brine and dried over MgSO4. The solution was filtered and concentrated in vacuo to give the crude product. The crude material was purified by flash column chromatography (hexane/EtOAc) to provide 1.37 g (31.5% yield) of 1-benzyl-3,5-dimethyl-piperidin-4-one.

1. customquenched with water
2. extractionThe aqueous layer was extracted with CH2Cl2
3. washwashed with brine
4. dry with materialdried over MgSO4
5. filtrationThe solution was filtered
6. concentrationconcentrated in vacuo
7. customto give the crude product
8. customThe crude material was purified by flash column chromatography (hexane/EtOAc)