[Cl:1][C:2]1[NH:3][C:4](I)=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=1.C(N(CC)CC)C>C(O)C.[C].[Pd]>[Cl:1][C:2]1[NH:3][CH:4]=[C:5]([N+:7]([O-:9])=[O:8])[N:6]=12-Chloro-5-iodo-4-nitroimidazole (273 mg) was dissolved in ethanol (5 ml), then triethylamine (420 μl) and 10% palladium-carbon (27 mg) were added, the reaction mixture was subjected to hydrogenation at a room temperature under normal pressure for 3 hours, there was obtained 2-chloro-4-nitroimidazole (124 mg, yield: 84.1%) as colorless solid product.
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