Hydrochloric Acid → {4-[(Anilinocarbonyl)amino]phenyl}acetic acid

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To a stirred solution of ethyl 4-(N′-phenylureido)phenylacetate (9.64 g, 32.3 mmol) in THF (80 ml) was added 0.5 N NaOH (80 ml) and the reaction mixture was heated under reflux for 5 hr. After cooled to room temperature, the mixture was poured into ice-1 N HCl. The resulting precipitate was collected under a reduced pressure and the crude solid was recrystallized from MEOH—CHCl3 to give 4-(N′-phenylureido)phenylacetic acid (8.14 g, 93%) as a white crystalline powder. MS (FAB) m/z 271 (M++1); Anal. Calcd for C15H14N2O3: C, 66.66; H, 5.22; N, 10.36. Found: C, 66.45; H, 5.22; N, 10.30.

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