Lithium Hydroxide → 6-((2,2,2-Trifluoroethoxy)methyl)imidazo[1,2-a]pyridine-3-carboxylic acid

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Reaction Steps

A solution of ethyl 6-((2,2,2-trifluoroethoxy)methyl)imidazo[1,2-a]pyridine-3-carboxylate (97) (280 mg, 0.92 mmol) in THF/MeOH/H2O (3:2:1, 5 mL) was treated with 6N LiOH (0.92 mL, 5.52 mmol) and stirred at room temperature for 1 hour. All solvents were removed and 6N HCl was added to adjust pH 5-6. Then the mixture was purified by HPLC to give 6-((2,2,2-trifluoroethoxy)methyl)imidazo[1,2-a]pyridine-3-carboxylic acid (98). 1H NMR (400 MHz, d6-DMSO) δ 9.34 (m, 1H), 8.40 (s, 1H), 7.88 (dd, J=0.8, 9.2 Hz, 1H), 7.65 (dd, J=1.6, 9.2 Hz, 1H), 4.83 (s, 2H), 4.18 (q, J=9.6 Hz, 2H). MS m/z 275.1 (M+1)+.

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