反应详情

To a tetrahydrofuran (60 mL) solution of (4-oxo-cyclohexyl)-acetic acid methyl ester (2.14 g) obtained in Example (1c), methylamine (2.0 M tetrahydrofuran solution, 12.5 mL), acetic acid (0.72 mL), and sodium triacetoxyborohydride (2.67 g) were added at room temperature. After 4 hours, the reaction mixture was diluted with saturated sodium bicarbonate (100 mL). The organic solvent was removed under reduced pressure. The aqueous mixture was subjected to extraction with dichloromethane (×3). The dichloromethane layer was dried over sodium sulfate and then concentrated. The residue was purified by column chromatography (NH silica gel, dichloromethane/methanol) to obtain the title compound (822 mg, 35%) as a brown oil.

1. customThe organic solvent was removed under reduced pressure
2. extractionThe aqueous mixture was subjected to extraction with dichloromethane (×3)
3. dry with materialThe dichloromethane layer was dried over sodium sulfate
4. concentrationconcentrated
5. customThe residue was purified by column chromatography (NH silica gel, dichloromethane/methanol)