反应详情

A mixture of N-(4-nitrophenyl)-1H-benzimidazol-2-amine (947 mg) and N,N-diisopropylethylamine (1.45 g) in THF (10 mL) at −78° C. was treated dropwise with a solution of bromoacetyl bromide (826 mg) in THF (2.0 mL) then the resulting mixture was allowed to warm to ambient temperature overnight. After this time, the reaction mixture was diluted with water (50 mL) and extracted with ethyl acetate (2×100 mL). The organic layers were washed with brine (50 mL), dried over sodium sulfate, and filtered and the filtrate was concentrated under reduced pressure. The residue obtained was purified by chromatography (silica, heptane to 2:3 ethyl acetate/heptane) to afford 1-(4-nitrophenyl)-1,2-dihydro-3H-imidazo[1,2-a]benzimidazol-3-one (92 mg) as a yellow solid.

1. extractionextracted with ethyl acetate (2×100 mL)
2. washThe organic layers were washed with brine (50 mL)
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationthe filtrate was concentrated under reduced pressure
6. customThe residue obtained
7. customwas purified by chromatography (silica, heptane to 2:3 ethyl acetate/heptane)