Thionyl Chloride → 9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbonitrile

Participants

Reaction Steps

To a solution of 9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxamide (1.73 g, 4.37 mmol) in N,N-dimethylformamide (20 mL) was added thionyl chloride (1.05 mL, 14.4 mmol). The resultant mixture was stirred at 50° C. for 1.5 hr and poured into saturated aqueous sodium hydrogen carbonate at 0° C. The resultant precipitate was collected by filtration, washed with water and diisopropyl ether to give the title compound as a pale white solid (1.496 g, 3.96 mmol, 91%).

Provenance & Evidence