[O:1]=[C:2]1[N:6]([CH2:7][CH2:8][NH:9][C:10](=[O:16])[O:11][C:12]([CH3:15])([CH3:14])[CH3:13])[C:5]2[CH:17]=[CH:18][CH:19]=[CH:20][C:4]=2[NH:3]1.[H-].[Na+].I[CH3:24]>C1COCC1>[CH3:24][N:3]1[C:4]2[CH:20]=[CH:19][CH:18]=[CH:17][C:5]=2[N:6]([CH2:7][CH2:8][NH:9][C:10](=[O:16])[O:11][C:12]([CH3:15])([CH3:14])[CH3:13])[C:2]1=[O:1]To a solution of tert-butyl (2-(2-oxo-2,3-dihydro-1H-benzo[d]imidazol-1-yl)ethyl)carbamate (190 mg, 0.69 mmol) in THF (10 mL) was added sodium hydride (34.5 mg, 0.86 mmol, 60% in mineral oil) at 0° C. under nitrogen in a sealed tube. After the resulting reaction mixture was stirred at room temperature for 20 min, iodomethane (112 mg, 0.79 mmol) in THF (2 mL) was added at 0° C. under nitrogen. The reaction was stirred at room temperature for 4 h. The reaction was quenched with saturated aqueous ammonium chloride solution and the aqueous layer was extracted with ethyl acetate. The combined organic layers were washed with brine, dried over anhydrous sodium sulfate and filtered. Concentration under vacuum gave the crude product, which was purified by silica gel column chromatography (20% ethyl acetate in petroleum ether) to afford the title compound (100 mg, 0.345 mmol, 50% yield). MS (ESI) m/z 292.1 [M+H]+.
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