[Cl:1][C:2]1[N:3]([C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[C:4]2[C:9]([C:10]=1[CH:11]=[O:12])=[CH:8][C:7]([O:13][CH3:14])=[CH:6][CH:5]=2.Cl([O-])=[O:22].[Na+].P([O-])(O)(O)=O.[Na+]>C(O)(C)(C)C.CC(=CC)C.O>[Cl:1][C:2]1[N:3]([C:15]2[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=2)[C:4]2[C:9]([C:10]=1[C:11]([OH:22])=[O:12])=[CH:8][C:7]([O:13][CH3:14])=[CH:6][CH:5]=2The compound of step 3 (456 mg, 1.59 mmol) was dissolved in tert-butanol (15 ml) and 2-methyl-2-butene (3 ml), and a solution of sodium chlorite (1.32 g, 14.6 mmol) and sodium dihydrogenphosphate (1.32 g, 11.0 mmol) in water (6 ml) was added. The reaction mixture was stirred at room temperature for 48 h and afterwards at 80° C. for 2.5 h. The mixture was diluted with water and extracted with EA. The organic layer was dried over sodium sulfate, filtered and the solvent was removed under reduced pressure to give 602 mg of the crude title compound.
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