反应详情

2-Nitro-5-piperazinylcinnamic acid (10 g) was suspended in 100 ml of ethyl alcohol and to the suspension was added dropwise 3 ml of thionyl chloride with ice cooling externally while stirring. After completion of addition, the mixture was heated under reflux for 3 hours and ethyl alcohol and thionyl chloride were removed by distillation. The residue was added to isopropyl alcohol and heated to dissolve. After cooling, yellow crystals which precipitated were collected by filtration to give 4.3 g of 2-nitro-5-piperazinylcinnamic acid ethyl ester hydrochloride, m.p. 210°-220° C.

1. additionAfter completion of addition
2. temperaturethe mixture was heated
3. temperatureunder reflux for 3 hours
4. customethyl alcohol and thionyl chloride were removed by distillation
5. additionThe residue was added to isopropyl alcohol
6. temperatureheated to dissolve
7. temperatureAfter cooling
8. customyellow crystals which precipitated
9. filtrationwere collected by filtration