反应详情

温度

0 °C

To a stirred solution of (±)-cis-4-benzyloxycarbonylamino-3-(4-nitro-benzoyloxy)-piperidine-1-carboxylic acid tert-butyl ester (0.63 mmol, 0.315 g) in THF (5 mL) at 0° C. was added LiOH (0.16 g) dissolved in water (1.5 mL) and continued stirring at 0° C. for 30 min followed by 2 h at room temperature. The reaction mixture was concentrated under reduced pressure. The residue was dissolved in water (10 mL) and extracted with ethyl acetate. The combined organic layers were dried, filtered and concentrated under reduced pressure. The residue was purified by silica gel flash column chromatography to provide (±)-cis-4-benzyloxycarbonylamino-3-hydroxy-piperidine-1-carboxylic acid tert-butyl ester.

1. waitfollowed by 2 h at room temperature
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. dissolutionThe residue was dissolved in water (10 mL)
4. extractionextracted with ethyl acetate
5. customThe combined organic layers were dried
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by silica gel flash column chromatography