反应详情

To a solution of [(3,5-dihydroxy-pyridine-2-carbonyl)-amino]-acetic acid tert-butyl ester, 28, (0.10 g, 0.37 mmol) in CH2Cl2 (4 mL) at room temperature is added trifluoroacetic acid (1 mL). The reaction is stirred for 16 hours at room temperature and then concentrated under reduced pressure. The solid that remains is collected by filtration, washed with Et2O to afford 0.070 g (89% yield) of the desired compound as a colorless solid. 1H NMR (250 MHz, DMSO-d6) δ ppm 10.86 (1H, br s), 9.00 (1H, t, J=6.1 Hz), 7.77 (1H, d, J=2.4 Hz), 6.69 (1H, d, J=2.4 Hz), 3.95 (1H, d, J=6.2 Hz). HPLC-MS: m/z 213 [M+H]+.

1. concentrationconcentrated under reduced pressure
2. filtrationThe solid that remains is collected by filtration
3. washwashed with Et2O