反应详情

To a three neck 250 mL round bottom flask equipped with a reflux condenser and nitrogen inlet was added 5-nitro-quinoxaline (4 g, 22.8 mmol) dissolved in HOAc (60 mL). The mixture was heated to boiling, removed from heat, and solid Fe powder (3.83 g, 68.6 mmol) was added. Vigorous boiling was observed. The reaction mixture was heated at reflux 10 minutes and then poured into H2O (100 mL) and ice. The aqueous solution was filtered and basified to pH>10 with 1 M NaOH, and extracted in EtOAc (3×200 mL). The organic layers were combined, dried over Na2SO4, and concentrated. The resulting oil was purified by column chromatography (40% EtOAc/Hexanes) yielding 2.03 g (61%) of an orange solid: mp 87-90° C.

1. customTo a three neck 250 mL round bottom flask equipped with a reflux condenser and nitrogen inlet
2. temperatureThe mixture was heated
3. customremoved
4. temperaturefrom heat
5. temperatureThe reaction mixture was heated
6. temperatureat reflux 10 minutes
7. filtrationThe aqueous solution was filtered
8. extractionextracted in EtOAc (3×200 mL)
9. dry with materialdried over Na2SO4
10. concentrationconcentrated
11. customThe resulting oil was purified by column chromatography (40% EtOAc/Hexanes)