Hydrochloric Acid → 6-(4-Bromo-2-chloro-phenylamino)-7-chloro-3-methyl-3H-benzoimidazole-5-carboxylic acid

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Reaction Steps

6-(4-Bromo-2-chloro-phenylamino)-7-chloro-3-methyl-3H-benzoimidazole-5-carboxylic acid methyl ester 10ee (21 mg, 0.048 mmol) is dissolved into 2:1 THF/water (1.2 mL) and NaOH (0.190 mL, 1.0 M aqueous solution, 0.190 mmol) is added. After stirring for 4 hours the reaction is diluted with water and acidified to pH 2 by addition of 1.0 M HCl. The mixture is then extracted with 3:1 EtOAc/THF (3×), dried (Na2SO4) and concentrated to give quantitative yield of desired product as a white solid. MS APCI (+) m/z 414, 416 (M+, Br pattern) detected.

Provenance & Evidence