反应详情

Twenty grams of (4-methoxyphenyl)hydrazine hydrochloride, 18.6 g of ethyl (ethoxymethylene)cyanoacetate and 15.2 g of potassium carbonate were combined with 200 ml of ethanol and refluxed for 20 hours. The mixture was cooled and poured into ice water. The precipitated solid was collected by filtration, dried and recrystallized from ethanol to afford 8.1 g of 5-amino-1-(4-methoxyphenyl)-1H-pyrazole-4-carboxylic acid, ethyl ester. Yield 28%. mp=209°-211° C.

1. temperaturerefluxed for 20 hours
2. temperatureThe mixture was cooled
3. filtrationThe precipitated solid was collected by filtration
4. customdried
5. customrecrystallized from ethanol