反应详情

Aqueous HCl (5 M, 20 mL) was added to a suspension of 6-acetamidoflavonol (6) (1.00 g, 3.39 mmol) in ethanol (30 mL) and the mixture was heated under reflux for 1.5 h. The mixture was cooled and made basic with aqueous NH3 (litmus) and the precipitate formed was collected by filtration to afford 6-aminoflavonol as a bright yellow powder (0.437 g, 51%), m.p. 211-212° C. 1H NMR (399.7 MHz, d6-DMSO) δ 5.48 (s, 1H, NH); 7.08 (dd, 1H, J5,7 2.8, J7,8 9.2 Hz, H7); 7.14 (d, 1H, J5,7 2.8 Hz, H5); 7.47-7.57 (m, 4H, H3′,4′,5′,8); 8.17 (app. d, 2H, J=7.6 Hz, H2′,6′); 8.62 (br s, 1H, OH).

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1.5 h
3. temperatureThe mixture was cooled
4. customthe precipitate formed
5. filtrationwas collected by filtration