反应详情

温度

70 °C

Iodine monochloride (1.25 ml) was added to a solution of 3-nitro-2-chloroaniline (4265 mg) in glacial acetic acid (40 ml). The mixture was stirred for four hours at 70° C. After the mixture was allowed to cool to ambient temperature, saturated sodium sulphite solution (100 ml) was added. The solution was extracted with EtOAc (200 ml), volatile material was removed by evaporation and the residue was redissolved in EtOAc (150 ml), washed with saturated sodium bicarbonate solution (75 ml), brine (75 ml) and dried. The volatile material was removed by evaporation and the residue was purified by chromatography eluting with 5-15% EtOAc in hexane to give a mixture of the title compound and the starting material (1.933 g) (ratio 1:1.75). Iodine monochloride (0.28 ml) was added to a solution of the mixture (1919 mg) in glacial acetic acid (10 ml). The mixture was stirred for four hours at 70° C. After the mixture was allowed to cool to ambient temperature, saturated sodium sulphite solution (50 ml) added. The solution was extracted with EtOAc (100 ml), volatile material was removed by evaporation and the residue was partitioned between EtOAc (100 ml) and saturated sodium bicarbonate solution (50 ml). The organic phase was separated, washed with brine (50 ml) and dried. The volatile material was removed by evaporation and the residue was purified by chromatography eluting with 5-15% EtOAc in hexane to give the title compound (1286 mg) as a solid. NMR: 6.19 (s, 2H), 6.73 (d, 1H), 7.50 (d, 1H); m/z 297.

1. temperatureto cool to ambient temperature
2. extractionThe solution was extracted with EtOAc (200 ml), volatile material
3. customwas removed by evaporation
4. dissolutionthe residue was redissolved in EtOAc (150 ml)
5. washwashed with saturated sodium bicarbonate solution (75 ml), brine (75 ml)
6. customdried
7. customThe volatile material was removed by evaporation
8. customthe residue was purified by chromatography
9. washeluting with 5-15% EtOAc in hexane
10. customto give