1-(4-Fluoro-3-nitro-benzyl)-piperidine—TFA salt (2.69 g, 0.00764 mol), cyclohexanamine (3.87 mL, 0.0339 mol) and N,N-Diisopropylethylamine (6.00 mL, 0.0344 mol) were dissolved in N,N-dimethylformamide (8.00 mL, 0.103 mol). The mixture was apportioned into four vials and each was microwaved at 300 watts, 130° C. for 7 minutes. The combined reaction mixtures were diluted with ethyl acetate, washed with 5% citric acid, saturated sodium chloride, dried over sodium sulfate and concentrated to give 3.40 g of the title compound as the citrate salt.
