反应详情

A solution of (R)-1-(3,5-dichloro-phenyl)-3-methyl-3-(4-trifluoromethoxy-benzyl)-1H-imidazo[1,2-α]imidazol-2-one (Example 1) (1.54 g, 3.38 mmol) in 30 mL of THF was treated with N-iodosuccinimide (0.846 g, 3.76 mmol) and pyridinium p-toluenesulfonate (0.086 g, 0.37 mmol). The mixture was stirred at room temperature for 17 h, then diluted with EtOAc and washed with 10% Na2S2O3 solution and water. The combined aqueous layers were extracted with 10 mL of EtOAc. The combined organic phases were washed with 25 mL of brine, dried over Na2SO4, filtered and concentrated. The crude orange oil was purified by silica gel chromatography to provide 1.27 g (65%) of (R)-1-(3,5-dichloro-phenyl)-5-iodo-3-methyl-3-(4-trifluoromethoxy-benzyl)-1H-imidazo[1,2-α]imidazol-2-one as an off-white oil (582.0, M+1).

1. washwashed with 10% Na2S2O3 solution and water
2. extractionThe combined aqueous layers were extracted with 10 mL of EtOAc
3. washThe combined organic phases were washed with 25 mL of brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude orange oil was purified by silica gel chromatography