HCID 58002993, compound → 7-Cyclopentyl-5-methoxy-2,2-dimethyl-6-[4-(trifluoromethyl)benzoyl]-2,3-dihydro-4H-chromen-4-one
Reaction equation
[CH:1]1([C:6]2[CH:15]=[C:14]3[C:9]([C:10](=[O:18])[CH2:11][C:12]([CH3:17])([CH3:16])[O:13]3)=[C:8]([O:19][CH3:20])[C:7]=2[CH:21]([OH:32])[C:22]2[CH:27]=[CH:26][C:25]([C:28]([F:31])([F:30])[F:29])=[CH:24][CH:23]=2)[CH2:5][CH2:4][CH2:3][CH2:2]1>ClCCl.[O-2].[Mn+4].[O-2]>[CH:1]1([C:6]2[CH:15]=[C:14]3[C:9]([C:10](=[O:18])[CH2:11][C:12]([CH3:16])([CH3:17])[O:13]3)=[C:8]([O:19][CH3:20])[C:7]=2[C:21](=[O:32])[C:22]2[CH:27]=[CH:26][C:25]([C:28]([F:29])([F:30])[F:31])=[CH:24][CH:23]=2)[CH2:2][CH2:3][CH2:4][CH2:5]1Participants
4
Procedure
100 mg (0.22 mmol) of 7-cyclopentyl-6-{hydroxy[4-(trifluoromethyl)phenyl]methyl}-5-methoxy-2,2-dimethyl-2,3-dihydro-4H-chromen-4-one (Example 7A) are dissolved in 5 ml of dichloromethane, 194 mg (2.23 mmol) of manganese(IV) oxide are added and the mixture is stirred at room temperature overnight. The mixture is filtered through a layer of silica gel, the filter cake is washed thoroughly with ethyl acetate and the filtrate is concentrated to dryness. The crude product is chromatographed on silica gel (mobile phase: cyclohexane/ethyl acetate 10:1). This gives 82.5 mg (83% of theory) of the title compound.