反应详情

To a solution of (S)-6-((S)-1-(tert-butyldimethylsilyloxy)ethyl)-2,2-dimethylpiperidin-4-one (42 mg, 0.15 mmol) in MeOH (3 mL) was added NaBH4 (5.6 mg, 0.15 mmol) at 0° C. After the mixture was stirred for 1 h, the mixture was diluted with water (5 mL) and extracted with EtOAc (20 mL). The extract was washed with brine, dried over Na2SO4, and concentrated in vacuo. Purification by column chromatography (EtOAc/Heptane) gave 32 mg (76%) of (6S)-6-((S)-1-(tert-butyldimethylsilyloxy)ethyl)-2,2-dimethylpiperidin-4-ol (a 5:1 mixture of diastereomers): 1H NMR (400 MHz, CHLOROFORM-d) δ 4.17-4.27 (m, 1H), 3.71-3.78 (m, 1H), 2.92-3.02 (m, 1H), 1.56-1.67 (m, 2H), 1.30-1.37 (m, 2H), 1.25 (s, 3H), 1.07 (d, J=6.1 Hz, 3H), 1.02 (s, 3H), 0.83 (s, 9H), 0.01 (s, 3H), 0.00 (s, 3H).

1. extractionextracted with EtOAc (20 mL)
2. washThe extract was washed with brine
3. dry with materialdried over Na2SO4
4. concentrationconcentrated in vacuo
5. customPurification by column chromatography (EtOAc/Heptane)