反应详情

温度

0 °C

To a solution of 2-amino-5-nitrobenzamide (18.1 g) and triethylamine (15 mL) in THF (100 mL) was added dropwise a solution of ethyl chloroglyoxylate (14.4 g) in THF (20 mL) under ice-cooling, and the mixture was stirred at 0° C. for 1 hr. 1N Hydrochloric acid was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with water, saturated aqueous sodium hydrogencarbonate and saturated brine, dried, and concentrated. The obtained crude crystals were washed with diisopropyl ether to give ethyl {[2-(aminocarbonyl)-4-nitrophenyl]amino}(oxo)acetate (8.1 g).

1. temperaturecooling
2. extractionthe mixture was extracted with ethyl acetate
3. washThe organic layer was washed with water, saturated aqueous sodium hydrogencarbonate and saturated brine
4. customdried
5. concentrationconcentrated
6. customThe obtained crude crystals
7. washwere washed with diisopropyl ether