反应详情

To a slurry of methylpyrimidine-2-carboxylate (1.0 g, 7.2 mmol) in EtOH (5.6 mL) was added hydrazine monohydrate (0.72 mL, 14 mmol). The reaction mixture became homogeneous and after 5 min a precipitate formed. Stirring was continued for 1 h. The mixture was filtered, and the collected solid was washed with additional EtOH to provide the desired product as a beige solid (720 mg, 72%). MS (ESI): mass calcd. C5H6N4O, 138.1; m/z found, 139.1 [M+H]+. 1H NMR (500 MHz, DMSO-d6): 10.06 (s, 1H), 8.92 (d, J=4.9 Hz, 2H), 7.64 (t, J=4.9 Hz, 1H), 4.64 (s, 2H).

1. customa precipitate formed
2. waitwas continued for 1 h
3. filtrationThe mixture was filtered
4. washthe collected solid was washed with additional EtOH