Triacetoxyperiodinane → 5-(4-Fluorophenyl)-7-isopropyl-2,2-dimethyl-6-[4-(trifluoromethoxy)benzoyl]-2,3-dihydro-4H-chromen-4-one

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Reaction Steps

At 0° C., 185 mg (439 μmol) of 1,1-dihydro-1,1,1-triacetoxy-1,2-benziodoxol-3(1H)-one are added to a solution of 110 mg (220 μmol) of 5-(4-fluorophenyl)-6-{hydroxy[4-(trifluoromethoxy)-phenyl]methyl}-7-isopropyl-2,2-dimethyl-2,3-dihydro-4H-chromen-4-one (Example 24A) in 4.5 ml of dichloromethane, and the mixture is stirred at this temperature for 4 h. The mixture is then diluted with dichloromethane and washed three times with 1 M aqueous sodium hydroxide solution. The organic phase is dried over magnesium sulfate and then concentrated under reduced pressure, and the residue is purified by column chromatography on silica gel (mobile phase: gradient cyclohexane→eyclohexane/ethyl acetate 10:1).

Provenance & Evidence