Hydrochloric Acid → 6-Bromo-2-phenylimidazo[1,2-a]pyridine-7-carboxylic acid

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Reaction Steps

NaOH (1N, 61 ml) was added to a suspension of 6-bromo-2-phenyl-imidazo[1,2-a]pyridine-7-carboxylic acid methyl ester (10.11 g, 31 mmol) in a mixture of water (30 ml) and ethanol (60 ml), and the mixture was heated to reflux (2 h). The mixture was cooled (0° C.) and HCl (conc., ˜10 ml) was slowly added. The dark brown suspension was filtered, washed with a small amount of ethanol, and dried under vacuum. The obtained title compound (9.47 g, 98%) was used in the next step without further purification. MS (m/e)=318.9 [M+H+].

Provenance & Evidence