[O:1]=[C:2]1[C:7]([CH:8]2[CH2:13][CH2:12][N:11](C(OCC3C=CC=CC=3)=O)[CH2:10][CH2:9]2)=[CH:6][CH:5]=[N:4][NH:3]1>C(O)C.[Pd]>[NH:11]1[CH2:10][CH2:9][CH:8]([C:7]2[C:2](=[O:1])[NH:3][N:4]=[CH:5][CH:6]=2)[CH2:13][CH2:12]1A solution of benzyl 4-(3-oxo-2,3-dihydropyridazin-4-yl)piperidine-1-carboxylate (0.90 mg, 2.88 mmol) and 10% Pd/C (500 mg) in ethanol (25 mL), was hydrogenated under a balloon for 4 h. The reaction was filtered through celite, washed with ethanol and concentrated to give the title compound (465 mg). MS 180.1 (M+1).
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