反应详情

To a solution of 8-chloro-5-(1-ethylpropyl)-2,3-dihydro-1H-imidazo[1,2-a]benzimidazole (32.9 mg, 0.125 mmol) in N,N-dimethylformamide (0.5 mL) was added sodium hydride (19.8 μL, 0.142 mmol) at 0° C. After 15 min, to the mixture was added 2,4,6-trimethylacetophenone (27.2 mg, 0.149 mmol). The reaction mixture was stirred at room temperature for 18 hrs. The mixture was diluted with water and extracted with ethyl acetate (×3). The combined organic layer was washed and brine (×1), dried over anhydrous magnesium sulfate and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 0-30% ethyl acetate/n-hexane gradient mixture. The resulting solid was recrystallized from n-hexane to give the title compound as a pale pink powder (24.0 mg, 0.0585 mmol, 47%).

1. extractionextracted with ethyl acetate (×3)
2. washThe combined organic layer was washed
3. dry with materialbrine (×1), dried over anhydrous magnesium sulfate
4. concentrationconcentrated in vacuo
5. customThe residue was purified by silica gel column chromatography
6. washeluting with a 0-30% ethyl acetate/n-hexane gradient mixture
7. customThe resulting solid was recrystallized from n-hexane