Imidazole → 1-(5-Imidazol-1-yl-2-nitro-phenyl)-piperidine

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To 1-(5-chloro-2-nitro-phenyl)-piperidine (184 mg, 0.760 mmol, as prepared in Example 3, step (a)) and imidazole (67.8 mg, 0.99 mmol) in 3 mL of DMSO was added KOH (64 mg, 1.1 mmol). The reaction was heated to 90° C. overnight. The dark solution was poured into 40 mL of water and extracted with EtOAc (2×50 mL). The combined organic layers were washed with water (50 mL), dried (Na2SO4) and concentrated in vacuo to give 190 mg (92%) of the title compound as a yellow solid. Mass spectrum (ESI, m/z): Calcd. for C14H16N4O2, 273.1 (M+H), found 273.1.

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