Sodium Hydroxide → 7-(4-Bromo-2-chlorophenylamino)-8-chloroimidazo[1,2-a]pyridine-6-carboxylic acid

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To a solution of methyl 7-(4-bromo-2-chlorophenylamino)-8-chloroimidazo[1,2-a]pyridine-6-carboxylate (366 mg, 0.81 mmol) in a mixture of MeOH (30 ml) and THF (10 ml) was added 10 ml of 1M aq. NaOH solution and the solution was stirred for 18 hours at room temperature. The solvents were reduced in vacuo, and it was extracted using 1M HCl/EtOAc/THF. The organic layers were washed with brine and dried with Na2SO4, and the solvents were removed in vacuo to give the crude product which was used without further purification (200 mg, 62%). 1H-NMR (500 MHz, DMSO-D6): δ=9.33 (s, 1H), 8.11 (s, 1H), 7.69-7.68 (d, 1H), 7.35-7.33 (dd, 1H), 6.67-6.65 (d, br, 1H).

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