Triacetoxyperiodinane → 5-Cyclohex-1-en-1-yl-7-isopropyl-2,2-dimethyl-6-[4-(trifluoromethyl)benzoyl]-2,3-dihydro-4H-chromen-4-one

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Reaction Steps

At 0° C., 153 mg (360 μmol) of 1,1-dihydro-1,1,1-triacetoxy-1,2-benziodoxol-3(1H)-one are added to a solution of 85 mg (180 μmol) of 5-cyclohex-1-en-1-yl-6-{hydroxy[4-(trifluoromethyl)phenyl]-methyl}-7-isopropyl-2,2-dimethyl-2,3-dihydro-4H-chromen-4-one (Example 35A) in 4 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→cyclohexane/dichloromethane/ethyl acetate 20:20:0.5).

Provenance & Evidence