Formamide → 9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxamide

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Reaction Conditions

Reaction Steps

A mixture of methyl 9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxylate (2.00 g, 4.87 mmol), formamide (1.94 mL, 48.7 mmol) and sodium methoxide (28% solution in methanol, 4.8 mL) in N,N-dimethylformamide (12 mL) was stirred at 120° C. for 19 hr. The mixture was diluted with aqueous saturated ammonium chloride. The resultant precipitate was collected by filtration, washed with water and diisopropyl ether to give the title compound (1.73 g, 4.37 mmol, 90%) as a pale yellow solid.

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