HCID 57786099, compound → HCID 57786163, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde (3.00 g, 8.67 mmol) in tetrahydrofuran (25 mL) was added dropwise ethylmagnesium bromide (3.0 M solution in diethyl ether, 3.4 mL, 10.4 mmol) at 0° C., and the mixture was stirred at 0° C. for 1 hr. The reaction was quenched by methanol, and the mixture was neutralized 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 40-100% 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 (2.95 g, 7.84 mmol, 90%).

Provenance & Evidence