反应详情

A yellow solution of the chlorhydrate salt of methyl 5-amino-5-(2,6-dimethoxyphenyl)pentanoate (14.96 mmol) in THF (92 ml) was treated with a solution of aq. sat. NaHCO3 (23.5 ml). The resulting heterogeneous mixture was further stirred at rt, under nitrogen, for 327 h. This reaction mixture was then treated with a solution of aq. sat. NaHCO3 (25 ml), water (50 ml), and AcOEt (200 ml). The layers were separated and the slightly yellow aq. layer was further extracted with AcOEt (50 ml). The mixed yellow organic layers were then dried over anh. MgSO4, filtered, and concentrated to dryness under reduced pressure. Purification by FC (DCM/MeOH=20/1) afforded 6-(2,6-dimethoxyphenyl)-piperidin-2-one as a beige solid. LC-MS (conditions B): tR=0.83 min.; [M+H]+: 236.49 g/mol.

1. customThe layers were separated
2. extractionthe slightly yellow aq. layer was further extracted with AcOEt (50 ml)
3. dry with materialThe mixed yellow organic layers were then dried over anh. MgSO4
4. filtrationfiltered
5. concentrationconcentrated to dryness under reduced pressure
6. customPurification by FC (DCM/MeOH=20/1)