反应详情

To a solution of 41.60 g of p-nitrobenzylamine in 660 ml of dry ethanol was added 49.34 g of α-bromomalonamide and 38.2 ml of triethylamine. After being stirred for two hours under refluxing, the reaction mixture was cooled to room temperature. And then separated crystals were filtered off, washed with ethanol and isopropyl ether, and dried to give 53.36 g of α-(4-nitrobenzyl)aminomalonamide. And a mixture of 50.45 g of α-(4-nitrobenzyl)aminomalonamide, 177.8 g of triethyl orthoformate and 0.76 g of p-toluenesulfonic acid monohydrate in 1.3 liters of dry ethanol was stirred for three hours under refluxing in an argon atmosphere. The reaction mixture was cooled on an ice-bath and separated crystals were filtered off, washed with ethanol and isopropyl ether, and dried to give 50.78 g of 5-carbamoyl-1-(4-nitrobenzyl)imidazolium-4-olate.

1. temperatureunder refluxing in an argon atmosphere
2. temperatureThe reaction mixture was cooled on an ice-bath
3. customseparated crystals
4. filtrationwere filtered off
5. washwashed with ethanol and isopropyl ether
6. customdried