CN(C)C=[CH:4][C:5]1[C:12]([N+:13]([O-:15])=[O:14])=[CH:11][C:8]([C:9]#[N:10])=[C:7]([O:16][CH2:17][CH3:18])[N:6]=1.O.I([O-])(=O)(=O)=[O:22].[Na+]>O1CCCC1>[CH2:17]([O:16][C:7]1[N:6]=[C:5]([CH:4]=[O:22])[C:12]([N+:13]([O-:15])=[O:14])=[CH:11][C:8]=1[C:9]#[N:10])[CH3:18]To a stirred solution of the compound prepared in Example 445 (1.07 g) in tetrahydrofuran (20 mL) at ambient temperature was added water (20 mL), and to the resulting mixture was added sodium periodate (2.62 g). The resulting mixture was stirred at ambient temperature for 18 hours. There was a significant amount of precipitate present in the reaction mixture, and it was collected by filtration and washed with 50% aqueous tetrahydrofuran. The combined filtrate and wash were concentrated to remove most of the tetrahydrofuran, and the residue was extracted with chloroform. The organic layers were combined and dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel, eluting with 1/1 hexanes/ethyl acetate, to provide the title compound (0.61 g) with the following physical data.
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