Hydrochloric Acid → 6-(3-Cyanopropyl)imidazo[1,2-a]pyridine-3-carboxylic acid

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Reaction Conditions

Reaction Steps

To a stirring solution of ethyl 6-(3-cyanopropyl)imidazo[1,2-a]pyridine-3-carboxylate (24w) (375 mg, 1.46 mmol) in THF:MeOH (4:1, 5 mL) was added 2N LiOH (500 μL). The reaction was heated at 50° C. for 45 minutes then cooled to room temperature and the pH was adjusted between 3-4 with 1N HCl. The solvent was partially concentrated and the remaining aqueous was lyophilized to yield 6-(3-cyanopropyl)imidazo[1,2-a]pyridine-3-carboxylic acid (25). 1H NMR (400 MHz, d6-DMSO) δ 9.21-9.19 (m, 1H), 8.45 (s, 1H), 7.85 (dd, J=0.8, 9.2 Hz, 1H), 7.70 (dd, J=1.6, 9.2 Hz, 1H), 2.82 (t, J=7.2 Hz, 2H), 2.55 (t, J=7.2 Hz, 2H), 1.97-1.90 (m, 2H). MS m/z 230.3 (M+1)+.

Provenance & Evidence