5-Bromobarbituric Acid : A Mild and Selective Monobrominating Agent Employed in the Synthesis of the Gastrin Antagonist GR174152

Abstract
5-Bromobarbituric acid (5) is a convenient reagent for the selective bromination of cyclic imine 3. A facile, in situ synthesis of this reagent involving a disproportionation reaction between barbituric acid and dibromobarbituric acid is described.