反应详情

温度

20 °C

To a solution of 3-methoxy-4-(4-methyl-imidazol-1-yl)-phenylamine (5.08 g, 25.0 mmol) in ethanol (25 mL) was added at 20° C. cyanamide (3.15 g, 75 mmol) dissolved in water (3.2 mL) and then 37% aqueous hydrochloric acid solution (4.9 g, 50 mmol). The solution was heated for 3 h to reflux. Additional cyanamide (2.1 g) in water (2.1 mL) and 37% aq hydrochloric acid solution (2.8 mL) were added and the mixture was heated to reflux for another 2 h. At 20° C. 65% aqueous nitric acid (3.5 mL, 50 mmol) was added. The reaction was stirred for 30 minute at 20° C. and the formed precipitate was filtered off, washed with ethanol and diethyl ether. (Caution: the filtrate may contain the ethyl ester of nitric acid). The solid was dried under reduced pressure at 20° C. to yield the title compound (5.42 g, 58%) as a white solid.

1. temperatureThe solution was heated for 3 h
2. temperatureto reflux
3. temperaturethe mixture was heated
4. temperatureto reflux for another 2 h
5. customAt 20° C
6. filtrationthe formed precipitate was filtered off
7. washwashed with ethanol and diethyl ether
8. customThe solid was dried under reduced pressure at 20° C.