反应详情

A mixture of 2-amino-4-benzyloxy-5-methoxybenzamide (J. Med. Chem., 1977, 20, 146-149; 10 g), (3-dimethylamino-2-azaprop-2-en-1-ylidene)dimethylammonium chloride (Gold's reagent, 7.4 g) and dioxane (100 ml) was stirred and heated to reflux for 24 hours. Sodium acetate (3.02 g) and acetic acid (1.65 ml) were added and the reaction mixture was heated for a further 3 hours. The mixture was evaporated and water was added to the residue. The resultant solid was collected by filtration, washed with water and dried. The material was recrystallised from acetic acid to give 7-benzyloxy-6-methoxy-3,4-dihydroquinazolin-4-one (8.7 g).

1. temperatureheated
2. temperatureto reflux for 24 hours
3. temperaturethe reaction mixture was heated for a further 3 hours
4. customThe mixture was evaporated
5. additionwater was added to the residue
6. filtrationThe resultant solid was collected by filtration
7. washwashed with water
8. customdried
9. customThe material was recrystallised from acetic acid