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To a microwave tube was added 6-(3-fluorophenyl)-N-(piperidin-4-yl)nicotinamide (2.2 g, 7.35 mmol, tert-butyl 6-bromonicotinate (2.85 g, 11 mmol), DMA (5 mL), CsF(6.70 g, 44.1 mmol) and TEA (5 drops). After heating the reaction mixture on CEM microwave at fullpower (100° C. for 45 min), the solution was extracted with ethyl acetate and washed with water. The solvent was removed and the residue purified by chromatography (silica, 50% EtOAc: Hep) to give the desired product, tert-butyl 6-[4-({[6-(3-fluorophenyl)pyridin-3-yl]carbonyl}amino)piperidin-1-yl]nicotinate (3.39 g, 97%). 1H NMR (400 MHz, DMSO-d6) □ ppm 9.06 (1H, d, J=1.1 Hz), 8.58 (1H, d, J=1.6 Hz), 8.47 (1H, d, J=7.9 Hz), 8.27 (1H, d, J=8.4 Hz), 8.10 (1H, d, J=8.2 Hz), 7.98 (1H, d, J=8.4 Hz), 7.93 (1H, d, J=10.8 Hz), 7.86 (1H, d, J=9.1 Hz), 7.54 (1H, q), 7.29 (1H, t, J=8.6 Hz), 6.88 (1H, d, J=9.1 Hz), 4.41 (2H, d, J=13.5 Hz, 4.15 (1H, d, J=4.8 Hz), 3.10 (2H, t, J=12.3 Hz), 2.48 (2H, br. s.), 1.91 (2H, d, J=13.4 Hz), 1.50 (9H, s), HRMS (TOF, ES+) calculated 477.2302; observed 477.2515.
