Iodoethane → 2-[9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]butanenitrile

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Reaction Conditions

Reaction Steps

Potassium t-butoxide (315 mg, 2.81 mmol) was added to a stirred solution of [9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]acetonitrile (500 mg, 1.28 mmol) and ethyl iodide (499 mg, 3.20 mmol) in tetrahydrofuran (13 mL) at 0° C., and the mixture was stirred at 0° C. for 1 hr. The mixture was diluted with aqueous saturated ammonium chloride, and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 20-50% ethyl acetate/n-hexane gradient mixture. The filtrate was concentrated in vacuo to give the solid, which was recrystallized from ethanol/ethyl acetate to give the title compound as a colorless crystal (202 mg, 0.481 mmol, 38%).

Provenance & Evidence