反应详情

To a solution of 3-nitro-1,2-phenylenediamine (5.02 g) in ethanol (500 mL) was added at 60° C. a 40% aqueous solution of pyruvic aldehyde (17.72 g). The reaction solution was refluxed for 10 minutes, and thereto was added water (300 mL). The mixture was cooled to room temperature, and concentrated under reduced pressure. The precipitated crystals were collected by filtration, washed with cold water, and dried under reduced pressure to give 2-methyl-8-nitroquinoxaline (4.17 g, 67%) as orange crystals.

1. temperatureThe reaction solution was refluxed for 10 minutes
2. concentrationconcentrated under reduced pressure
3. filtrationThe precipitated crystals were collected by filtration
4. washwashed with cold water
5. customdried under reduced pressure