反应详情

温度

25 °C

A solution of methyl 3-aminobenzo[b]furan-2-carboxylate (0.28 g, 1.36 mmol) in formamide (5 mL) is heated at 135 C. for 4 h, then the temperature is raised to 170 C. After 4 h the reaction is cooled to 25° C. and a dark purple solid precipitates. The solid is collected by vacuum filtration and air dried to give 3H-benzofurano[3,2-d]pyrimid-4-one (118 mg, 46.6%). 1H NMR (DMSO) δ13.0 (1H, brs), 8.25 (1H, s), 8.05 (1H, d, J=8.1 Hz), 7.84 (1H, d, J=8.3 Hz), 7.68 (1H, t, J=7.7 Hz), 7.51 (1H, t, J=7.7 Hz).

1. temperaturethe temperature is raised to 170 C
2. customa dark purple solid precipitates
3. filtrationThe solid is collected by vacuum filtration and air
4. customdried