反应详情

A mixture of N-(3-phenoxy)propionyl-proline methyl ester (2.8 g) and sodium borohydride (950 mg) was suspended in tertiary butyl alcohol (40 ml). To the stirred suspension, dry methanol (8 ml) was added dropwise under reflux. Thereafter, the mixture was stirred under reflux for 1 hour. The heated mixture was cooled to room temperature and water (10 ml) was added under cooling with ice. Methanol and tertiary butyl alcohol were distilled off under vacuum and the residue was subjected to extraction with ethyl acetate. The extract was washed with brine and dried over anhydrous magnesium sulfate. The solvent was distilled off under vacuum and the resulting crude product was purified by medium-pressure liquid column chromatography on silica gel (solvent: chloroform) to obtain the end compound as an oil (2.3 g).

1. temperatureunder reflux
2. temperatureunder reflux for 1 hour
3. temperatureunder cooling with ice
4. distillationMethanol and tertiary butyl alcohol were distilled off under vacuum
5. extractionthe residue was subjected to extraction with ethyl acetate
6. washThe extract was washed with brine
7. dry with materialdried over anhydrous magnesium sulfate
8. distillationThe solvent was distilled off under vacuum
9. customthe resulting crude product was purified by medium-pressure liquid column chromatography on silica gel (solvent: chloroform)