反应详情

In 106 ml of dry benzene were dissolved 13.0 g of 2-(4-chlorobutoxy)-5-nitrobenzaldehyde, 7.28 g of ethyl propionylacetate, 0.20 ml of piperidine and 0.62 ml of acetic acid, and the solution was refluxed for 9 hours while removing water using a Dean-Stark trap. After cooling the reaction solution, 6.52 g of ethyl 3-aminocrotonate was added to the solution, and the mixture was refluxed under heating for 11 hours. After cooling the mixture, precipitated crude crystals were collected by filtration, and recrystallized from methanol to give 13.13 g of diethyl 2-ethyl-4-[2-(4-chlorobutoxy)-5-nitrophenyl]-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate.

1. temperaturethe solution was refluxed for 9 hours
2. customwhile removing water using a Dean-Stark trap
3. temperatureAfter cooling the reaction solution, 6.52 g of ethyl 3-aminocrotonate
4. additionwas added to the solution
5. temperaturethe mixture was refluxed
6. temperatureunder heating for 11 hours
7. temperatureAfter cooling the mixture
8. customprecipitated crude crystals
9. filtrationwere collected by filtration
10. customrecrystallized from methanol