反应详情

To a stirred mixture of Racemate-ethyl 3-amino-4-hydroxycyclohexanecarboxylate (4.7 g, 25 mmol) in 120 mL of dichloromethane was added triethylamine (3.03 g, 30 mmol), followed by the addition of N-(benzyloxycarbonyloxy)succinimide (6.55 g, 26.3 mmol) at 0° C. The reaction mixture was stirred at room temperature for 16 hours and then diluted with 200 mL of dichloromethane. The solution was washed with 5% citric acid solution (2×150 mL), 5% potassium carbonate solution (2×150 mL) and brine (200 mL). The organic layer was separated, dried over anhydrous sodium sulfate and filtered, followed by concentration under reduced pressure. The resultant oily matter was purified by silica gel chromatography (ethyl acetate:petroleum ether=1:4˜2:5), to thereby give the title compound (7.0 g, 87%) as a yellow oil. MS (ES+) C17H23NO5 requires: 321, found: 322 [M+H]+.

1. washThe solution was washed with 5% citric acid solution (2×150 mL), 5% potassium carbonate solution (2×150 mL) and brine (200 mL)
2. customThe organic layer was separated
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationfollowed by concentration under reduced pressure
6. customThe resultant oily matter was purified by silica gel chromatography (ethyl acetate:petroleum ether=1:4˜2:5)