Carbonate Ion → 4-[6-Bromo-2-(4-fluorophenyl)imidazo[1,2-a]pyridin-3-yl]-N-cyclopentylpyrimidin-2-amine

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In a similar manner as described in Example 2 from 1-[6-bromo-2-(4-fluorophenyl)imidazo[1,2-a]pyridin-3-yl]-2-propyn-1-one (1.0 g, 2.9 mmol), cyclopentylguanidine hydrochloride (0.71 g, 4.4 mmol) and anhydrous carbonate (0.6 g, 4.4 mmol), was obtained N-{4-[6-bromo-2-(4-fluorophenyl)imidazo[1,2-a]pyridin-3-yl]-2-pyrimidinyl}-N-cyclopentylamine (0.8 g, 61%) as a solid. 1H NMR (CDCl3) δ 10.0 (broad s, 1H), 8.13 (d, 1H), 7.65 (m, 3H), 7.44 (dd, 1H), 7.17 (t, 2H), 6.45 (s, 1H), 5.30 (d, 1H), 4.40 (m, 1H), 2.1 (m, 2H), 1.4–2.0 (m, 6H); 19F NMR (CDCl3) δ −112.8; MS m/z 452 (M+1).

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