Ammonium Chloride → Ethyl 3-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]pentanoate

Participants

Reaction Conditions

Reaction Steps

To a mixture of ethyl (2E)-3-[9-chloro-1-(2,4-dichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]prop-2-enoate (489 mg, 1.08 mmol) and copper (I) iodide (155 mg, 1.08 mmol) was added ethylmagnesium bromide (3.0 M in diethyl ether, 1.44 mL, 4.32 mmol) at 0° C. The mixture was stirred at 0° C. for 1 hr. Aqueous ammonium chloride was added to the reaction mixture at 0° C. and the mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with a 20-50% ethyl acetate/n-hexane gradient mixture to give the title compound (308 mg, 0.641 mmol, 59%) as a colorless amorphous.

Provenance & Evidence