反应详情

温度

80 °C

To a solution of 0.87 g (8.4 mmol) of 2-chloroimidazole in 14 mL of DMF was added 0.40 g (10 mmol) of 60% NaH in mineral oil. After 20 min of stirring, 2.5 g (8.4 mmol) of 4-bromo-2-tert-butoxycarbonylamino-butyric acid methyl ester in 5 mL of DMF was added. The reaction mixture was heated to 80° C. for 1 h. The mixture was diluted with EtOAc (150 mL), washed with water, brine, dried over MgSO4, filtered, and concentrated. The residue was purified by flash chromatography (0-5% MeOH in CH2Cl2) to provide 2.1 g (78%) of 2-tert-butoxycarbonylamino-4-1,2,3-triazol-2-yl-butyric acid methyl ester.

1. washwashed with water, brine
2. dry with materialdried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residue was purified by flash chromatography (0-5% MeOH in CH2Cl2)