Hydrochloric Acid → 4-[2-(3,5-Dichloro-4-pyridyl)-1-oxoethyl]-7-methoxybenzofuran-2-carboxylic acid

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Reaction Steps

Ethyl 4-[2-(3,5-dichloro-4-pyridyl)-1-oxoethyl]-7-methoxybenzofuran-2-carboxylate (6.0 g) was dissolved in methanol (60 ml), 5 N aqueous NaOH (15 ml) was added thereto under cooling on ice, and the mixture was returned to room temperature and stirred for 1 hour. Under cooling on ice, the reaction mixture was acidified by dropwise adding 1 N aqueous HCl, and the precipitated crystals were collected by filtration and washed with water to give the desired compound (5.4 g, 96%) as colorless crystals.

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