反应详情

To a solution of 2-mercapto-5-nitrobenzimidazole (3.0 g) and triethylamine (12.5 ml) in tetrahydrofuran (30 ml) was added dropwise a solution of 5-chloromethyl-1-propylimidazole hydrochloride (3.0 g) in methanol (30 ml) under nitrogen atmosphere at 0° C. After the mixture was allowed to be at room temperature and stirred for 10 minutes, water was added to the mixture and the mixture was extracted with ethyl acetate twice. The mixture was dried over magnesium sulfate, and the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (methanol:ethyl acetate=1:8→methanol:ethyl acetate=1:4), which was recrystallized from diisopropyl ether-ethyl acetate, to give 5-nitro-2-(((1-propylimidazol-5-yl)methyl)sulfanyl)benzimidazole (3.33 g) as yellow crystals.

1. customto be at room temperature
2. extractionthe mixture was extracted with ethyl acetate twice
3. dry with materialThe mixture was dried over magnesium sulfate
4. distillationthe solvent was distilled off under reduced pressure
5. customThe obtained residue was purified by silica gel column chromatography (methanol:ethyl acetate=1:8→methanol:ethyl acetate=1:4), which
6. customwas recrystallized from diisopropyl ether-ethyl acetate