反应详情

温度

100 °C

A heterogenous reaction mixture containing 2-bromo-nitrobenzene (2.02 g, 10.0 mmol) and piperazine (4.3 g, 50.0 mmol) was heated at 100° C. for 10 hours. The orange-red solid was extracted with ethyl acetate and washed thoroughly with 3 N NaOH solution followed by brine. The organic layer was separated and dried over Na2SO4, filtered and the solvent was removed in vacuo. The resulting red oil was purified by column chromatography on silica gel (1:1 hexane/EtOAc followed by 4:1 EtOAc/MeOH) to yield 1-(2-nitrophenyl)-piperazine as an orange-red oil (1.90 g, 92%). It was characterized as a hydrochloride salt. Analysis calculated for C10H14N3O2Cl0.10 CHCl3: C, 47.46; H, 5.56; N, 16.44. Found: C, 47.63; H, 5.69; N. 16.42.

1. extractionThe orange-red solid was extracted with ethyl acetate
2. washwashed thoroughly with 3 N NaOH solution
3. customThe organic layer was separated
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. customthe solvent was removed in vacuo
7. customThe resulting red oil was purified by column chromatography on silica gel (1:1 hexane/EtOAc followed by 4:1 EtOAc/MeOH)