Hydrochloric Acid → Propanoic acid, 3-[(2-bromophenyl)amino]-3-oxo-

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Diethyl malonate (101 mL, 0.989 mol) and 2-bromoaniline (50.g, 0.291 mol) were combined and heated at 180° C. for six hours. A Dean-Stark trap was used to collect the volatiles. The reaction was allowed to cool to ambient temperature overnight; a precipitate formed. The precipitate was isolated by filtration and combined with methanol (160 mL), water (800 mL), and solid sodium carbonate (105 g). The mixture was heated at reflux for two hours, allowed to cool to ambient temperature, and then cooled to 0° C. The mixture was adjusted to pH 2 with the addition of 3 N hydrochloric acid; a white precipitate formed. The precipitate was isolated by filtration, washed with water, and dried overnight on the filter funnel to provide 43 g of N-(2-bromophenyl)malonamic acid as a white solid.

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