Triacetoxyperiodinane → 9-Methoxy-1-(2-methoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carbaldehyde

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Reaction Steps

Dess-Martin reagent (1.31 g, 3.09 mmol) was added to a stirred solution of [9-methoxy-1-(2-methoxy-4,6-dimethylpyrimidin-5-yl)-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl]methanol (761 mg, 2.06 mmol) in dimethyl sulfoxide (0.50 mL) and acetonitrile (8.2 mL) at 0° C., and the mixture was stirred at room temperature for 3 hr. The mixture was diluted with saturated aqueous sodium hydrogen carbonate 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 0-5% methanol/ethyl acetate gradient mixture. The eluate was concentrated in vacuo to give the title compound as a brown solid (467 mg).

Provenance & Evidence