[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11](C(OCC2C=CC=CC=2)=O)[CH2:10][CH:9]1[C:24](=[O:28])[NH:25][O:26][CH3:27])=[O:7])([CH3:4])([CH3:3])[CH3:2].[H][H]>[Pd].CO>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][NH:11][CH2:10][CH:9]1[C:24](=[O:28])[NH:25][O:26][CH3:27])=[O:7])([CH3:4])([CH3:3])[CH3:2]A mixture of 2-Methoxycarbamoyl-piperazine-1,4-dicarboxylic acid 4-benzyl ester 1-tert-butyl ester (0.23 g, 0.58 mmol) and activated 10 wt. % palladium on carbon (0.048 g) in methanol (8 mL) was stirred vigorously under 40 psi hydrogen atmosphere for 2 hours. The reaction mixture was then filtered through a microglass filter paper and the solid washed abundantly with methanol. The solvent was evaporated in vacuo to yield the title compound.
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