C([O:8][N:9]1[C:15](=[O:16])[N:14]2[CH2:17][C@H:10]1[CH2:11][CH2:12][C@H:13]2[C:18]([NH:20][N:21]1[CH2:26][CH2:25][CH2:24][CH2:23][C:22]1=[O:27])=[O:19])C1C=CC=CC=1>CO.[Pd]>[OH:8][N:9]1[C:15](=[O:16])[N:14]2[CH2:17][C@H:10]1[CH2:11][CH2:12][C@H:13]2[C:18]([NH:20][N:21]1[CH2:26][CH2:25][CH2:24][CH2:23][C:22]1=[O:27])=[O:19]To a solution of compound 257 (55 mg, 0.148 mmol) in 10 mL of MeOH was added 100 mg of Pd/C (10%, wet). The mixture was hydrogenated at room temperature for 2 h. The catalyst was removed by filtration through Celite pad. The filtrate was concentrated to afford compound 258 as a colorless gum (37 mg, 88%).
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