反应详情

8-Methoxy-2,4-dichloroquinazoline (3.7 g, 0.016 mol) was stirred in a mixture of water (85 ml), tetrahydrofuran (125 ml), o-toluidine (1.7 g, 0.016 mol) and sodium acetate (2.2 g, 0.027 mol) for a total of 4 days with heating to 50° for a total of 32 hours and the addition of a total of 20 ml 0.01 mol NaOH dropwise over this period maintaining the pH at 7. The reaction mixture was evaporated in vacuo and crystallised from ethanol/water to give 8-methoxy-4-(2-methylphenylamino)-2-chloroquinazoline (2.89 g, 60%) m.p. 218°-220°.

1. temperaturewith heating to 50° for a total of 32 hours
2. temperaturemaintaining the pH at 7
3. customThe reaction mixture was evaporated in vacuo
4. customcrystallised from ethanol/water