反应详情

A mixture of 6-amino-5-chloro-2-(methyloxy)-3-pyridinecarboxylic acid (Y. Hirokawa et al., Bioorg. Med. Chem. Lett., 1998, 12, 1551–1554, 500 mg, 2.47 mmol) and 1,1′-carbonyldiimidazole (440 mg, 2.71 mmol) in N,N-dimethylformamide (15 ml) was stirred at room temperature for 45 min. A solution of 1,1-dimethylethyl 4-(aminomethyl)-1-piperidinecarboxylate (529 mg, 2.47 mmol) in N,N-dimethylformamide (5 ml) was added and the resulting mixture was stirred at room temperature for 5 h. The mixture was poured into water (200 ml) and extracted with ethyl acetate/toluene (2:1, 200 ml×3). The combined organic layer was washed with water, dried over magnesium sulfate, and concentrated in vacuo. The obtained residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:25) to give 703 mg (71%) of the title compound as a pale yellow amorphous solid.

1. stirringthe resulting mixture was stirred at room temperature for 5 h
2. extractionextracted with ethyl acetate/toluene (2:1, 200 ml×3)
3. washThe combined organic layer was washed with water
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated in vacuo
6. customThe obtained residue was chromatographed on a column of silica gel eluting with methanol/dichloromethane (1:25)