反应详情

To a cooled (0° C.) solution of (S)-2-(3-Amino-2-oxo-2H-pyridin-1-yl)-butyric acid tert-butyl ester (500 mg, 1.98 mmol) in dichloromethane (5 mL) was added triethylamine (220 mg, 2.18 mmol) followed by acetic anhydride (202 mg, 1.98 mmol). The reaction mixture was stirred at room temperature for 12 hours and then partitioned between EtOAc and aqueous 1M HCl. The organic layer was washed with saturated aqueous NaHCO3, brine (30 mL), dried (MgSO4), filtered and evaporated. The residue was purified by flash chromatography (40% ethyl acetate/hexane) to afford the title compound as a colourless oil (569 mg, 97%): 1H NMR (400 MHz, CDCl3) δ 0.87 (3H, t), 1.40 (9H, s), 1.91 (1H, m), 2.13 (3H, s), 2.19 (1H, m), 5.38 (1H, dd), 6.26 (1H, t), 6.99 (1H, d), 8.33 (1H, d), 8.43 (1H, br s).

1. custompartitioned between EtOAc and aqueous 1M HCl
2. washThe organic layer was washed with saturated aqueous NaHCO3, brine (30 mL)
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. customevaporated
6. customThe residue was purified by flash chromatography (40% ethyl acetate/hexane)