反应详情

Add diisobutylaluminum hydride (1.4 mL, 1.37 mmol, 1.0 M in toluene) to a solution of (R)-5-[(1S,2S)-1-benzyloxy-2-dibenzylamino-3-(3,5-difluorophenyl)-propyl]-2-oxomorpholine-4-carboxylic acid tert-butyl ester (0.75 g, 1.1 mmol) in of dry toluene (15 mL) at −78° C. under nitrogen and stir at this temperature for 2 hours (Monitor by TLC). Add methanol to quench the reaction (1.0 mL), then saturated aqueous potassium sodium tartrate (Rochelle salt) and ethyl acetate. Warm to room temperature and stir vigorously for 30 minutes. Separate the organic layer and extract the aqueous with ethyl acetate. Combine the organic layers and dry (magnesium sulfate), filter and concentrate to give the desired compound as a mixture of the two possible isomers as a white solid and used in the next step without further purification (0.75 g).

1. customAdd methanol to quench
2. customthe reaction (1.0 mL)
3. stirringstir vigorously for 30 minutes
4. customSeparate the organic layer
5. extractionextract the aqueous with ethyl acetate
6. dry with materialdry (magnesium sulfate)
7. filtrationfilter
8. concentrationconcentrate