Benzyl Chloride → [9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]acetonitrile

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Reaction Steps

Thionyl chloride (0.53 mL, 7.22 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]methanol (1.38 g, 3.61 mmol) and pyridine (0.10 mL) in tetrahydrofuran (30 mL) at 0° C., and the mixture was stirred at room temperature for 90 min. The mixture was diluted with saturated aqueous sodium hydrogen carbonate, and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. A solution of sodium cyanide (354 mg, 7.22 mmol) in water (1.5 mL) was added to the resulting benzyl chloride in dimethylsulfoxide (12 mL), and the mixture was stirred at room temperature for 14 hr. The mixture was diluted with saturated aqueous sodium hydrogen carbonate, and the precipitate was collected by filtration, washed with diisopropyl ether to give the title compound as a colorless powder (1.36 g, 3.47 mmol, 96% in 2 steps).

Provenance & Evidence