反应详情

A mixture of 2-amino-5-methoxy4-(3-morpholinopropoxy)benzamide (4.57 g, 12.25 mmol) and Gold's reagent (2.6 g, 15.89 mmol) in dioxane (35 ml) was heated at reflux for 5 hours. Acetic acid (0.55 ml) and sodium acetate (1.0 g) were added to the reaction mixture which was heated for a further 3 hours. The mixture was cooled to ambient temperature and the volatiles removed by evaporation. The residue was adjusted to pH7 with 2 M sodium hydroxide and then purified on a Diaion (trade mark of Mitsubishi) HP20SS resin column, eluting with methanol (gradient of 0 to 60%) in water. Concentration of the fractions by evaporation gave a precipitate which was collected by filtration and dried under vacuum over phosphorus pentoxide to give 6-methoxy-7-(3-morpholinopropoxy)-3,4-dihydroquinazolin-4-one (3.04 g, 78%) as a white solid.

1. temperaturewas heated
2. temperatureat reflux for 5 hours
3. temperaturewas heated for a further 3 hours
4. customthe volatiles removed by evaporation
5. custompurified on a Diaion (trade mark of Mitsubishi) HP20SS resin column
6. washeluting with methanol (gradient of 0 to 60%) in water
7. customConcentration of the fractions by evaporation
8. customgave a precipitate which
9. filtrationwas collected by filtration
10. dry with materialdried under vacuum over phosphorus pentoxide