反应详情

To a biphasic mixture of 4.93 g (20 mmol) of tert-butyl (1S)-1-[(1S)-2-amino-1-hydroxyethyl]pentylcarbamate & tert-butyl (1S)-1-[(1R)-2-amino-1-hydroxyethyl]pentylcarbamate in 32 mL dichloromethane and 15 mL saturated sodium bicarbonate was added 24 mL (24 mmol) of 1 M 2-pyridinesulfonyl chloride in dichloromethane. The reaction mixture was stirred overnight and then extracted with dichloromethane. The extract was washed with brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with ethyl acetate:hexanes (6:4) to afford 5.00 g (65%) of tert-butyl (1S)-1-{(1SR)-1-hydroxy-2-[(2-pyridinylsulfonyl)amino]ethyl}pentylcarbamate & tert-butyl (1S)-1-{(1R)-1-hydroxy-2-[(2-pyridinylsulfonyl)amino]ethyl}pentylcarbamate. 1H-NMR (300 MHz, DMSO-d6): δ 8.73 (d, J=4 Hz, 1H), 8.09 (t, J=8 Hz, 1H), 7.93 (dd, J=8 Hz, J=4 Hz, 1H), 7.68 (m, 1H), 7.60 and 7.54 ((t, J=6 Hz), (t, J=6 Hz), 1H), 6.55 and 6.36 ((d, J=9 Hz), (d, J=9 Hz), 1H), 4.78 (m, 1H), 3.50–2.70 (m, 4H), 1.61 (m, 1H), 1.37-1.05 (m, 14H), 0.86 (t, J=7 Hz, 3H); ES-LCMS m/z 410 (M+Na).

1. extractionextracted with dichloromethane
2. washThe extract was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by silica gel chromatography
6. washeluting with ethyl acetate:hexanes (6:4)