反应详情

温度

95 °C

A mixture of iron (113.9 g), conc. hydrochloric acid (57 ml) and water (2.3 liters) was stirred at 95° C. for 20 minutes. To the mixture was added during 10 minutes 4-amino-6-nitroquinazoline (114.1 g). The reaction mixture was stirred at 95° C. for an hour and a half and then filtered. The filter cake was washed with hot water. The combined filtrate and washings were concentrated under reduced pressure to give a residue, to which was added a small volume of ethanol to give precipitates. The precipitates were separated by filtration and dried to give 4,6-diaminoquinazoline hydrochloride (94.8 g). The same compound (4.3 g) was recovered from the mother liquor in the same manner as mentioned above.

1. stirringThe reaction mixture was stirred at 95° C. for an hour
2. filtrationa half and then filtered
3. washThe filter cake was washed with hot water
4. concentrationThe combined filtrate and washings were concentrated under reduced pressure
5. customto give a residue
6. customto give
7. customprecipitates
8. customThe precipitates were separated by filtration
9. customdried