反应详情

7-Benzyloxy-4-(4-chloro-2-fluorophenoxy)-6-methoxyquinazoline (1.4 g, 3.4 mmol) was suspended in TFA (15 ml) and heated at reflux for 3 hours. The reaction mixture was allowed to cool, toluene was added and the volatiles were removed by evaporation under vacuum. The residue was triturated with ether and then acetone. The precipitate was collected by filtration and dried to give 4-(4-chloro-2-fluorophenoxy)-7-hydroxy-6-methoxyquinazoline (21.8 g). This was used without further purification in the next step.

1. temperatureheated
2. temperatureat reflux for 3 hours
3. temperatureto cool
4. customthe volatiles were removed by evaporation under vacuum
5. customThe residue was triturated with ether
6. filtrationThe precipitate was collected by filtration
7. customdried