反应详情

温度

130 °C

Step 1 A mixture of 2-amino-4-methoxybenzoic acid (0.5 g, 2.99 mmol) and formamidine acetate (0.623 g, 5.98 mmol) in 2-methoxyethanol (4 mL) was heated at 130° C. After 15.25 h, the mixture was cooled to rt. The resulting precipitate was collected by filtration, washed with methanol and dried to provide 7-methoxyquinazolin-4-ol as a tan solid (473 mg, 90%). 1H NMR (400 MHz, DMSO-d6) δ 12.08 (1H, br. s.), 8.06 (1H, s), 8.03 (1H, d, J=9.5 Hz), 7.03-7.14 (2H, m), 3.90 (3H, s).

1. temperaturethe mixture was cooled to rt
2. filtrationThe resulting precipitate was collected by filtration
3. washwashed with methanol
4. customdried