Formamidine acetate → 7-Benzyloxy-6-methoxy-3H-quinazolin-4-one
反応式
[NH2:1][C:2]1[CH:17]=[C:16]([O:18][CH2:19][C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[C:15]([O:26][CH3:27])=[CH:14][C:3]=1[C:4](OCC1C=CC=CC=1)=[O:5].C(O)(=O)C.[CH:32](N)=[NH:33]>C(O)C(C)C>[CH2:19]([O:18][C:16]1[CH:17]=[C:2]2[C:3]([C:4](=[O:5])[NH:33][CH:32]=[N:1]2)=[CH:14][C:15]=1[O:26][CH3:27])[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1参加物
4
反応条件
- 温度
- 97 °C
実験手順
Benzyl 2-amino-4-(benzyloxy)-5-methoxybenzoate (80.0 g), formamidine acetate (32.0 g) and isobutanol (480 ml) were mixed. The reaction mixture was then heated to 97° C. and stirred at this temperature for 6 hours. The reaction mixture was then cooled to 25° C. over a period of at least an hour and then stirred at this temperature for 30 minutes. The product (7-benzyloxy-6-methoxy-3,4-dihydroquinazolin-4-one) was isolated by filtration, washed with isobutanol (64.2 g) and dried in the vacuum oven at a temperature of from 40 to 45° C. Yield: 60.8 g, 98%; NMR Spectrum (DMSOd6) 3.9 (s, 3H), 5.3 (s, 2H), 7.3 (s, 1H), 7.3-7.5 (m, 6H), 8.0 (s, 1H); Mass Spectrum (M+H)+=283.1.