[N+:1]([C:4]1[CH:5]=[N:6][CH:7]=[CH:8][C:9]=1Cl)([O-:3])=[O:2].C(N(CC)C(C)C)C.[C:19]([N:26]1[CH2:31][CH2:30][NH:29][CH2:28][CH2:27]1)([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20]>ClCCl>[C:22]([O:21][C:19]([N:26]1[CH2:31][CH2:30][N:29]([C:9]2[CH:8]=[CH:7][N:6]=[CH:5][C:4]=2[N+:1]([O-:3])=[O:2])[CH2:28][CH2:27]1)=[O:20])([CH3:25])([CH3:23])[CH3:24]3-Nitro-4-Chloro pyridine (10 mmol) dissolved in dichloromethane (25 mL) and diethyl iso propyl amine (20 mmol) followed Boc piperazine(10 mmol) was added to the above solution while cooling at 0° C. and the reaction mixture was stirred at room temperature for overnight . The dichloromethane was evaporated under vacuum. The resulting solid is extracted in to dichloromethane and washed with citric acid and brine solution. The evaporation of dichloromethane gave a yellow solid, 4-(3-Nitro-pyridin-4-yl)-piperazine-1-carboxylic acid tert-butyl ester which is used for next step without purification.
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