Cl[C:2]1[CH:7]=[CH:6][C:5]([N+:8]([O-:10])=[O:9])=[CH:4][N:3]=1.C(N(CC)C(C)C)(C)C.[O:20]=[C:21]1[CH2:26][NH:25][CH2:24][CH2:23][NH:22]1.O>CN(C=O)C>[N+:8]([C:5]1[CH:6]=[CH:7][C:2]([N:25]2[CH2:24][CH2:23][NH:22][C:21](=[O:20])[CH2:26]2)=[N:3][CH:4]=1)([O-:10])=[O:9]To a solution of 2-chloro-5-nitropyridine (623 mg, 3.9 mmol) in DMF (6 mL) was added N,N-diisopropylethylamine (1.4 mL, 8.5 mmol) and 2-oxopiperazine (424 mg, 4.24 mmol). The reaction mixture was heated at 85° C. for 40 min by microwave. Then the reaction mixture was cooled to RT, and poured into water (150 mL). The precipitate was filtered, washed with water and dried under vacuum to yield 4-(5-nitropyridin-2-yl)piperazin-2-one as a solid (588 mg, 68% yield). MS (M+1): 223.3
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