[CH3:1][C:2]1[C:3]([NH:8][C:9]([CH:11]2[CH2:16][CH2:15][N:14](C(OCC3C=CC=CC=3)=O)[CH2:13][CH2:12]2)=[O:10])=[N:4][CH:5]=[CH:6][CH:7]=1.[H][H]>C(O)C.[Pd]>[CH3:1][C:2]1[C:3]([NH:8][C:9]([CH:11]2[CH2:16][CH2:15][NH:14][CH2:13][CH2:12]2)=[O:10])=[N:4][CH:5]=[CH:6][CH:7]=1Benzyl 4-{[(3-methyl-2-pyridinyl)amino]carbonyl}-1-piperidinecarboxylate from Step 1 above (5.45 g, 15.42 mmol) was suspended in absolute ethanol (250 mL) and was treated with 10% palladium on carbon (1.50 g) and stirred vigorously for 18 h under 1 atm of hydrogen. The catalyst was filtered off and the filtrate was concentrated under reduced pressure giving the piperidine-4-carboxylic acid (3-methyl-pyridin-2-yl)-amide as yellow oil.
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