Synthesis
General procedure for the synthesis of 2-iodo-4-nitroaniline from 4-nitroaniline: 4-nitroaniline (298.2 mg, 2.16 mmol, 1.0 eq.) was dissolved in acetonitrile (3.0 mL) at room temperature, and N-iodosuccinimide (NIS, 579.1 mg, 2.36 mmol, 1.1 eq.) and trimeshylchlorosilane ( TMSCl, 27 μL, 23.1 mg, 0.21 mmol, 0.1 equiv) and the reaction was stirred at room temperature. The progress of the reaction was monitored by thin layer chromatography (TLC) and the reaction was completed after about 20 min. Water was added to the reaction mixture and the aqueous phase was extracted three times with ethyl acetate (EtOAc). The organic phases were combined, washed sequentially with saturated aqueous sodium bicarbonate (NaHCO3) and saturated aqueous sodium chloride (NaCl), dried over anhydrous sodium sulfate (Na2SO4) and concentrated under reduced pressure. The crude product was purified by column chromatography on silica gel (SiO2) with 50% ethyl acetate-hexane mixed solvent as eluent to give 545.6 mg (96% yield) of 2-iodo-4-nitroaniline as yellow crystals.
References
[1] Journal of Organic Chemistry, 2016, vol. 81, # 3, p. 772 - 780
[2] Synthesis, 2004, # 11, p. 1869 - 1873
[3] Russian Journal of Organic Chemistry, 2016, vol. 52, # 3, p. 433 - 436
[4] Zh. Org. Khim., 2016, vol. 52, # 3, p. 433 - 436,4
[5] Journal of Medicinal Chemistry, 2007, vol. 50, # 6, p. 1380 - 1400
