反应详情

To a solution of N-{1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propyl}acetamide (72.0 mg, 0.159 mmol) in N,N-dimethylformamide (1.6 mL) was added sodium hydride (60%, 7.6 mg, 0.19 mmol). After the resultant mixture was stirred at room temperature for 30 min, methyl iodide (0.0119 mL, 0.191 mmol) was added, and the resultant mixture wad stirred at 60° C. for 2 hr. After sodium hydride (60%, 7.6 mg, 0.19 mmol) and methyl iodide (0.0119 mL, 0.191 mmol) were added again, the resultant mixture was stirred at 60° C. for 2 hr, diluted with water and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 20-90% ethyl acetate/n-hexane gradient mixture to give the title compound as a colorless amorphous solid (12.8 mg, 0.0275 mmol, 17%).

1. extractionextracted with ethyl acetate
2. washThe combined organic layer was washed with brine
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash column chromatography on silica gel eluting with a 20-90% ethyl acetate/n-hexane gradient mixture