8-Chloro-2-(4-fluorophenyl)-3-(2-fluoro-4-pyridinyl)imidazo[1,2-α]pyridine (0.10 g, 0.29 mmol) was dissolved in cyclopentylamine (5 mL). This solution was heated in a glass tube at 150° C. for 72 hours. Ethyl acetate and water were added to the reaction mixture and the phases were separated. The organic phase was washed with water, dried (magnesium sulfate), filtered and concentrated to a solid. This solid was purified by silica gel chromatography (1:1 ethyl acetate:hexane) to give 4-[8-chloro-2-(4-fluorophenyl)imidazo[1,2-α]pyridin-3-yl]-N-cyclopentyl-2-pyridinamine (90 mg, 76%) as a white foam. 1H NMR (CDCl3): δ 8.26 (d, 1H), 8.06 (d, 1H), 7.73 (q, 2H), 7.34 (d, 1H), 7.05 (t, 2H), 6.77 (t, 1H), 6.65 (dd, 1H), 6.4 (s, 1H), 4.85 (d, 1H), 3.92 (m, 1H), 2.0–1.4 (m, 8H); 19F NMR (CDCl3) δ −114.07; MS m/z 407 (M+1).
