反应详情

To racemic Intermediate 19, one enantiomer being (1S,2S,5S)-1-hydroxymethyl-2-phenyl-3-aza-bicyclo[3.1.0]hexane-3-carboxylic acid tert-butyl ester (0.40 g, 1.4 mmol), was added anhydrous THF (5 mL), triphenylphosphine (0.43 g, 1.6 mmol), phthalimide (0.30 g, 2.1 mmol), and diethylazodicarboxylate (0.22 mL, 1.7 mmol). The reaction was allowed to stir at room temperature for 16 hours. The solvent was removed at reduced pressure and the residue partitioned between saturated sodium bicarbonate solution and methylene chloride, the organics were washed with brine, dried over sodium sulfate, filtered, and concentrated to an oil. The material was purified by chromatography on silica by elution with a gradient of 5 to 20% EtOAc/Hexanes to give the title compound as an white solid (0.56 g, 97% yield).

1. customThe solvent was removed at reduced pressure
2. customthe residue partitioned between saturated sodium bicarbonate solution and methylene chloride
3. washthe organics were washed with brine
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated to an oil
7. customThe material was purified by chromatography on silica by elution with a gradient of 5 to 20% EtOAc/Hexanes