C[O:2][C:3]([C:5]1[CH:6]=[C:7]([CH:11]2[CH2:15][CH2:14][N:13]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:12]2)[CH:8]=[CH:9][CH:10]=1)=[O:4].[OH-].[Na+]>CCO.O>[C:19]([O:18][C:16]([N:13]1[CH2:14][CH2:15][CH:11]([C:7]2[CH:6]=[C:5]([CH:10]=[CH:9][CH:8]=2)[C:3]([OH:4])=[O:2])[CH2:12]1)=[O:17])([CH3:22])([CH3:20])[CH3:21]To a solution of tert-butyl 3-(3-(methoxycarbonyl)phenyl)pyrrolidine-1-carboxylate (210 mg, 0.7 mmol) in EtOH (4 ml) was added a solution of NaOH (56 mg, 1.4 mmol) in H2O (1 ml) at 29° C. The mixture was stirred for 30 min at 29° C. The mixture was concentrated and the residue was treated with water and extracted with EA. The water layer was treated with 2N HCl until pH=3, extracted with EA and the combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give the title compound which was used in next step without further purification (200 mg, Yield 98.0%).
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