Sodium hydride → 9-Chloro-6-[1-(cyclopropylmethoxy)propyl]-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole

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Reaction Steps

To a solution of 1-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]propan-1-ol (120.0 mg, 0.292 mmol) in N,N-dimethylformamide (1.5 mL) was added sodium hydride (23.4 mg, 0.584 mmol) at 0° C. After 20 min, to the mixture was added cyclopropylmethyl bromide (0.14 mL, 1.46 mmol). The reaction mixture was stirred at room temperature for 1 day. The mixture was quenched with water and extracted with ethyl acetate (×3). The combined organic layer was washed with water (×2) and brine (×1), dried over anhydrous magnesium sulfate, filtered 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 colorless powder (123.0 mg, 0.265 mmol, 91%).

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