[N+:1]([C:4]1[CH:17]=[CH:16][C:7]([CH2:8][N:9]2[C:13](=[O:14])[CH2:12][NH:11][C:10]2=[O:15])=[CH:6][CH:5]=1)([O-])=O>CO.[Pd].[H][H]>[NH2:1][C:4]1[CH:17]=[CH:16][C:7]([CH2:8][N:9]2[C:13](=[O:14])[CH2:12][NH:11][C:10]2=[O:15])=[CH:6][CH:5]=1The 3-(4-nitrobenzyl)hydantoin derivative was dissolved in methanol (about 10 ml per mmol of hydantoin derivative) and hydrogenated with palladium/carbon in a hydrogen atmosphere until reaction was complete. The catalyst was filtered off and the solvent was removed on a rotary evaporator. The 3-(4-aminobenzyl)hydantoin derivative was obtained.
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