Cyclopentylamine → N-Cyclopentyl-3-[2-(cyclopentylamino)pyrimidin-4-yl]-2-(4-fluorophenyl)imidazo[1,2-a]pyridin-8-amine

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To a solution of 4-[8-chloro-2-(4-fluorophenyl)imidazo[1,2-α]pyridin-3-yl]-N-cyclopentyl-2-pyrimidinamine (200 mg, 0.49 mmol) in cyclopentylamine (10 mL) was added, successively, racemic-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (91 mg, 0.15 mmol), cesium carbonate (0.24 g, 0.7 mmol) and palladium(II) acetate (22 mg, 0.1 mmol). The resulting mixture was heated in a sealed tube at 100° C. for 18 hours at which time the reaction was judged complete by thin layer chromatography. The solution was cooled to room temperature and ethyl acetate and water were added. The phases were separated and the organic layer was washed with water and brine. The combined organics were dried (magnesium sulfate), filtered and concentrated to a solid. This solid was purified by silica gel chromatography (1:1 hexanes:ethyl acetate) to give N-cyclopentyl-3-[2-(cyclopentylamino)-4-pyrimidinyl]-2-(4-fluorophenyl)imidazo[1,2-α]pyridin-8-amine (120 mg, 55%) as a solid. 1H NMR (CDCl3) δ 8.80 (d, 1H), 8.06 (d, 1H), 7.62 (q, 2H), 7.10 (t, 2H), 6.76 (t, 1H), 6.34 (d, 1H), 6.27 (d, 1H), 5.22 (d, 2H), 4.34 (m, 1H), 3.93 (m, 1H), 2.0–2.1 (m, 4H), 1.4–1.9 (m, 12H); 19F NMR (CDCl3) δ −113.9; MS m/z 457 (M+1).

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