反应详情

A suspension of 0.249 g (1.0 mmol) of 2,3-dimethoxy-5-methyl-7-nitro-quinoxaline, 0.178 g (1 mmol) of N-bromosuccinimide and 0.016 g (0.1 mmol) of azo-isobutyronitrile in 3 ml of CCl4 is heated at reflux for 20 hours. The reaction mixture is washed with water and brine and concentrated using a rotary evaporator. Crystallization from ethyl acetate yields the title compound. TLC: hexane/ethyl acetate 6/1: Rf=0.63, 1H-NMR (CDCl3): δ 8.64 (d, J=3, 1H), 8.41 (d, J=3, 1H), 5.02(s, 2H), 4.27(s, 3H), 4.20 (s, 3H).

1. temperatureis heated
2. temperatureat reflux for 20 hours
3. washThe reaction mixture is washed with water and brine
4. concentrationconcentrated
5. customa rotary evaporator
6. customCrystallization from ethyl acetate