[CH:1]1([CH:4]([C:15]2[CH:20]=[CH:19][C:18]([OH:21])=[CH:17][CH:16]=2)[CH:5]2C(=O)OC(C)(C)[O:7][C:6]2=[O:14])[CH2:3][CH2:2]1.CN(C=O)C.O>CCOC(C)=O>[CH:1]1([CH:4]([C:15]2[CH:20]=[CH:19][C:18]([OH:21])=[CH:17][CH:16]=2)[CH2:5][C:6]([OH:14])=[O:7])[CH2:3][CH2:2]1A solution of 21.2 in 10:1 DMF/water (48 mL) was stirred overnight at 90° C. The mixture was cooled to room temperature, diluted with EtOAc, washed with 1 N HCl and brine, dried (MgSO4), and concentrated to afford 21.3. The crude product was used without further purification.
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