Hydrochloric Acid → 1-[9-Chloro-1-(2,4,6-trichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]-2,2,2-trifluoroethanol

Participants

Reaction Conditions

Reaction Steps

To a solution of 9-chloro-1-(2,4,6-trichlorophenyl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde (640 mg, 1.54 mmol) in tetrahydrofuran (8 mL) was added trimethyl(trifluoromethyl)silane (0.683 mL, 4.62 mmol) and tetrabutylammonium fluoride (1.0 M solution in tetrahydrofuran, 0.308 mL, 0.308 mmol) at 0° C. After the mixture was stirred at 0° C. for 30 min and at room temperature for 1 h, to the mixture was added 1N hydrochloric acid (2 mL) at 0° C., and the reaction mixture was stirred at room temperature for 30 min. The mixture was quenched with aqueous saturated sodium hydrogen carbonate and extracted with ethyl acetate. The combined organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 20-70% ethyl acetate/n-hexane gradient mixture to give the title compound as a colorless solid (329 mg, 0.678 mmol, 44%).

Provenance & Evidence