[CH3:1][C:2]1[CH:3]=[N:4][C:5]2[C:10]([CH:11]=1)=[C:9]([CH2:12][OH:13])[CH:8]=[CH:7][CH:6]=2>ClCCl.[O-2].[Mn+4].[O-2]>[CH3:1][C:2]1[CH:3]=[N:4][C:5]2[CH:6]=[CH:7][CH:8]=[C:9]([CH:12]=[O:13])[C:10]=2[CH:11]=130.0 g (173 mmol) of the compound from example 22A are taken up in 850 ml of dichloromethane, and 240.0 g of manganese(IV) oxide are added. The mixture is stirred at room temperature for 16 h and then filtered through kieselguhr. The latter is washed with dichloromethane, and the filtrate is concentrated in a rotary evaporator. Drying the residue results in 23.0 g (75% of theory) of the title compound.
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