[N-:1]=[N+:2]=[N-:3].[Na+].[CH:5]([C@H:7]1[C@@H:12]2[O:13]S(=O)O[C@@H:11]2[CH:10]=[C:9]([C:17]([O:19][CH3:20])=[O:18])[CH2:8]1)=[CH2:6]>CN(C=O)C.CCOC(C)=O>[N:1]([C@@H:11]1[C@@H:12]([OH:13])[C@H:7]([CH:5]=[CH2:6])[CH2:8][C:9]([C:17]([O:19][CH3:20])=[O:18])=[CH:10]1)=[N+:2]=[N-:3]Sodium azide can be added to a solution of Example 17G in DMF. The reaction mixture can be stirred overnight at room temperature, diluted with EtOAc, washed with brine, dried (MgSO4), filtered and concentrated. The concentrate can be purified by flash column chromatography to afford the desired product.
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