[CH2:1]([N:3]1[CH2:8][CH2:7][N:6]([C:9]2[CH:14]=[CH:13][C:12]([N+:15]([O-])=O)=[CH:11][N:10]=2)[CH2:5][CH2:4]1)[CH3:2].[H][H]>CO.[Pd]>[CH2:1]([N:3]1[CH2:4][CH2:5][N:6]([C:9]2[N:10]=[CH:11][C:12]([NH2:15])=[CH:13][CH:14]=2)[CH2:7][CH2:8]1)[CH3:2]A mixture of 2.47 g (10 mmol) 1-ethyl-4-(5-nitro-pyridin-2-yl)-piperazine and 0.247 g Pd/C (10%) in 25 ml methanol was treated with 1 bar hydrogen at room temperature for 2 h. After filtration the mixture was evaporated to dryness to yield 2.12 g (98%) of the title compound as colorless solid. (m/e): 207.3 (MH+; 100%).
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