Trifluoroacetic acid → 6-(2-(isopropylamino)thiazol-5-yl)-N-methyl-8-phenylimidazo[1,2-a]pyridine-2-carboxamide

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A solution of tert-butyl isopropyl(5-(2-(methylcarbamoyl)-8-phenylimidazo[1,2-a]pyridin-6-yl)thiazol-2-yl)carbamate (30 mg) in methylenechloride (2 ml) was treated with TFA (4 ml) and stirred at room temperature for 2 hours. The solvent was removed under vacuum and the residue chromatographed on silica gel using ethyl acetate as eluent to give 15 mg of 6-(2-(isopropylamino)thiazol-5-yl)-N-methyl-8-phenylimidazo[1,2-a]pyridine-2-carboxamide as a tan solid. LCMS (Conditions C): 2.62 min (RT); (M+H)+=392.14 (100%). 1H NMR, 500 MHz, CDCl3/CD3OD: δ 8.20 (s, 1 H), 8.19 (d, J=1.65 Hz, 1 H), 7.89 (d, J=1.37 Hz, 1 H), 7.88 (s, 1 H), 7.42-7.53 (m, 3 H), 7.36 (d, J=1.92 Hz, 1H), 7.34 (s, 1 H), 3.55-3.64 (m, 1 H), 1.34 (d, J=6.32 Hz, 6 H).

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