反应详情

To a solution of the 1-(4-bromophenyl)-2-methylpropyl 2,2,2-trichloroethanimidoate (2.6 mmol, 0.97 g) in CH2Cl2 (15 mL) was added (2S)-N-(cyanomethyl)-2-hydroxy-4-methylpentanamide from Step 1, Example 67 (3.9 mmol, 0.66 g) and then PPTS (0.26 mmol, 65 mg). The mixture was stirred at r.t. for 20 h. The mixture was diluted with EtOAc and washed with NaHCO3. The organic extract was dried (anhyd. MgSO4) and concentrated under reduced pressure to give an oil. Chromatography (10% Acetone/EtOAc) gave 2 diastereomers.

1. washwashed with NaHCO3
2. extractionThe organic extract
3. dry with materialwas dried (anhyd. MgSO4)
4. concentrationconcentrated under reduced pressure
5. customto give an oil