反应详情

温度

0 °C

To a solution of 1H-imidazole-2-carboxylic acid (0.17 g) in N,N-dimethylformamide (DMF) (3 mL) was added alanine tert-butyl ester hydrochloride (0.22 g), diisopropylethyl amine (0.27 mL) and HOBT (0.41 g) before cooling to 0° C. and the reaction mixture was then treated with EDC HCl (0.32 g). The cooling bath was removed and the reaction mixture was stirred at ambient temperature for 18 hrs before being diluted with ethyl acetate and washed with water and brine, dried (MgSO4) and concentrated at reduced pressure. The residue was purified by silica gel chromatography (30% ethyl acetate in hexanes) to afford the sub-title compound as a colourless oil (0.263 g, 73%): 1H NMR 400 MHz CDCl3 1.50 (9H, s), 1.51 (3H, d, J 7.2), 3.70 (1H, m), 7.28 (2H, s), 7.78 (1H, d, J 7.6), 11.49 (1H, br s).

1. customThe cooling bath was removed
2. additionbefore being diluted with ethyl acetate
3. washwashed with water and brine
4. dry with materialdried (MgSO4)
5. concentrationconcentrated at reduced pressure
6. customThe residue was purified by silica gel chromatography (30% ethyl acetate in hexanes)