反应详情

A mixture of 2-amino-4-benzyloxy-5-methoxybenzamide (10 g, 0.04 mol), (J. Med. Chem. 1977, vol 20, 146-149), and Gold's reagent (7.4 g, 0.05 mol) in dioxane (100 ml) was stirred and heated at reflux for 24 hours. Sodium acetate (3.02 g, 0.037 mol) and acetic acid (1.65 ml, 0.029 mol) were added to the reaction mixture and it was heated for a further 3 hours. The volatiles were removed by evaporation, water was added to the residue, the solid was collected by filtration, washed with water and dried. Recrystallisation from acetic acid gave 7-benzyloxy-6-methoxy-3,4-dihydroquinazolin-4-one (8.7 g, 84%).

1. temperatureheated
2. temperatureat reflux for 24 hours
3. temperaturewas heated for a further 3 hours
4. customThe volatiles were removed by evaporation, water
5. additionwas added to the residue
6. filtrationthe solid was collected by filtration
7. washwashed with water
8. customdried
9. customRecrystallisation from acetic acid