Hydrochloric Acid → 2-(2-chloro-4-fluoro-phenyl)-7-hydroxy-1H-benzoimidazole-4-carboxylic acid

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Reaction Steps

2-(2-chloro-4-fluoro-phenyl)-7-methoxy-1H-benzoimidazole-4-carboxylic acid methyl ester (3 g, 8.98 mmol) obtained in step 2 was dissolved in toluene and aluminum chloride (5.99 g, 44.90 mmol) was added thereto, refluxed for 8 hours. The resulting solution was cooled to room temperature, the reaction was stopped by adding 3 N HCl thereto and stirred for 30 min. The precipitate formed was filtered, washed with benzene and dried to obtain the title compound (1.87 g, 6.11 mmol) in a yield of 68%.

Provenance & Evidence