Hydrochloric Acid → 4-(4-Benzyloxycarbonylamino-2-fluorophenoxy)pyridine-2-carboxylic acid

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Reaction Steps

After dissolving 4-(4-benzyloxycarbonylamino-2-fluorophenoxy)pyridine-2-carboxylic acid methyl ester (10.7 g) in methanol (450 ml) and N,N-dimethylformamide (150 ml), water (75 ml) and lithium hydroxide (1.36 g) were added and the mixture was stirred for 1 hour at room temperature. After adding 1N hydrochloric acid (100 ml), the reaction mixture was concentrated under reduced pressure, ethyl acetate (500 ml) was added for partition, and the precipitated solid was filtered. The resultant solid was washed with water and hexane and then subjected to aeration drying. The organic layer of the obtained filtrate was washed with water (100 ml×2) and brine (200 ml) and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and then the obtained solid was washed with water and hexane and subjected to aeration drying. This solid was combined with the previously obtained solid and dried at 60° C. overnight to provide the title compound (9.53 g, 92.3%) as white powder.

Provenance & Evidence