Acetic Anhydride → [9-Chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl](cyclopropyl)methyl acetate

Participants

Reaction Steps

To a solution of [9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl](cyclopropyl)methanol (120.0 mg, 0.284 mmol) in pyridine (0.5 mL) was added acetic anhydride (0.3 mL) at 0° C. The reaction mixture was stirred at room temperature for 7 hrs. The mixture was concentrated. The residue was neutralized with aqueous saturated sodium hydrogen carbonate and extracted with ethyl acetate (×3). The combined organic layer was washed with brine (×1), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was purified, by silica gel column chromatography eluting with a 0-40% ethyl acetate/n-hexane gradient mixture. The residue was recrystallized from diisopropyl ether/n-hexane to give the title compound as a colorless powder (94.5 mg, 0.203 mmol, 72%).

Provenance & Evidence