Hydrochloric Acid → 6-Bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid

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Reaction Conditions

Reaction Steps

1.5 g of ethyl 6-bromo-8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylate (Example 18A; 3.5 mmol, 1 equivalent) were dissolved in 72 ml of THF/methanol 5:1, 17.6 ml of 1N aqueous lithium hydroxide solution (17.6 mmol, 5 equivalents) were added and the mixture was warmed to 40° C. and stirred at this temperature for 6 h. Using 6 N aqueous hydrochloric acid, the mixture was then adjusted to pH 4 and concentrated under reduced pressure. Water was added to the solid formed and the solid was triturated, filtered off, washed with water and dried under reduced pressure. This gave 1.24 g of the title compound (88% of theory).

Provenance & Evidence