反应详情

5-Nitro-2-(4-oxopiperidin-1-yl)benzonitrile (5.0 g), 2-hydroxyethylamine (1.5 g) and sodium cyanoborohydride (1.3 g) were added to a mixed solvent of methanol (100 ml) and tetrahydrofuran (50 ml) and the mixture was stirred at room temperature for 1 h. An aqueous hydrochloric acid solution was added to keep the reaction mixture acidic. The solvent was evaporated under reduced pressure. Aqueous sodium hydroxide solution was added to the residue and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate, after which the solvent was evaporated under reduced pressure. Diisopropyl ether was added to the residue to allow precipitation, whereby the title compound (3.6 g) was obtained, melting point: 115° C.

1. customThe solvent was evaporated under reduced pressure
2. additionAqueous sodium hydroxide solution was added to the residue
3. extractionthe mixture was extracted with ethyl acetate
4. washThe organic layer was washed with saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. customafter which the solvent was evaporated under reduced pressure
7. additionDiisopropyl ether was added to the residue
8. customprecipitation, whereby the title compound (3.6 g)
9. customwas obtained