Hydrochloric Acid → 1-[9-Chloro-1-(4,6-dimethoxy-2-methylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]-2,2,2-trifluoroethanol

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Reaction Steps

To a stirred solution of 9-chloro-1-(4,6-dimethoxy-2-methylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde (433 mg, 1.12 mmol) and trimethyl(trifluoromethyl)silane (495 μL, 3.35 mmol) in tetrahydrofuran (6.0 mL) was added a solution of tetrabutylammonium fluoride in tetrahydrofuran (1.0 M, 112 μL, 0.112 mmol) at 0° C. After 30 min, hydrochloric acid (1.0 M, 2.5 mL) was added. After 1 h, the reaction mixture was diluted with ethyl acetate, washed with aqueous sodium hydrogen carbonate and brine, dried over sodium sulfate, filtered, and concentrated in vacuo. The resulting solid was washed with diisopropyl ether to give the title compound as a pale yellow solid (445 mg, 0.972 mmol, 87%).

Provenance & Evidence