Hydrochloric Acid → 4-(4-Bromophenyl)-2-(1,3-dioxo-1,3-dihydroisoindol-2-yl)-thiophene-3-carboxylic acid

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Reaction Steps

To a solution of NaOH (1.4 mmol) in a 1:1 mixture of methanol:H2O (6 mL) is added 4-(4-bromophenyl)-2-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-thiophene-3-carboxylic acid ethyl ester (0.7 mmol, Example 21, Part C). The mixture is heated to reflux for 90 minutes, then diluted with water (12 mL), chilled in an ice bath, and acidified with concentrated HCl. The product that precipitates is collected by filtration, washed with water, and dried, affording the desired compound.

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