[I:1][C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][C:11]=1[O:12][CH:13]1[CH2:17][CH2:16][N:15]([C:18]([N:20]2[CH2:24][CH2:23][CH2:22][CH2:21]2)=[O:19])[CH2:14]1)[C:5]([O:7]C)=[O:6].[Li+].[OH-].C1COCC1.C(O)(=O)CC(CC(O)=O)(C(O)=O)O>O.CO>[I:1][C:2]1[CH:3]=[C:4]([CH:9]=[CH:10][C:11]=1[O:12][CH:13]1[CH2:17][CH2:16][N:15]([C:18]([N:20]2[CH2:24][CH2:23][CH2:22][CH2:21]2)=[O:19])[CH2:14]1)[C:5]([OH:7])=[O:6]A mixture of compound 34d (180 mg, 0.41 mmol), LiOH (39 mg, 1.62 mmol), THF (3 mL), MeOH (3 mL), and H2O (3 mL) was stirred at room temperature for 4 h. The mixture was acidified with 15% aqueous citric acid and extracted with EtOAc (3×). The combined organic extracts were washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The resultant residue was dried under reduced pressure for 2 h to give compound 34e (166 mg).
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