Dimethyl Sulfoxide → 1-[5-(4-Methyl-pyrazol-1-yl)-2-nitro-phenyl]-piperidine

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A solution of 1-(5-fluoro-2-nitro-phenyl)-piperidine (98 mg, 0.43 mmol, as prepared in Example 22, step (a), 3-methylpyrazole (49.2 mg, 0.6 mmol), and NaOH (22.4 mg, 0.56 mmol) were heated in 3 mL of DMSO at 90° C. overnight. The reaction was diluted with EtOAc (50 mL), washed with water (2×50 mL), dried (Na2SO4) and concentrated in vacuo to afford 117 mg (95%) the title compound as a yellow solid. Mass spectrum (ESI, m/z): Calcd. for C15H18N4O2 287.1 (M+H), found 287.1.

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