反应详情

A mixture of 1-methoxycarbonyl-3-(2-aminophenyl)thiourea (10.9 g., 0.048 mole), maleic anhydride (4.7 g; 0.048 mole) and ethanol (200 ml) was boiled under reflux with stirring for one hour. The clear solution was allowed to cool and the crystals which deposited were filtered off. These were recrystallised once from ethanol and once from a mixture of acetone and petroleum spirit (b.p. 60°-80° C.) to give 1-methoxycarbonyl-3-[2-(3-carboxyacrylamido)phenyl]thiourea (4.4 g) m.p. 170°-173° C. (with decomposition).

1. temperatureunder reflux
2. temperatureto cool
3. filtrationthe crystals which deposited were filtered off
4. customThese were recrystallised once from ethanol and once from a mixture of acetone and petroleum spirit (b.p. 60°-80° C.)