Superacid Activated Condensation of Parabanic Acid and Derivatives with Arenes. A New Synthesis of Phenytoin and 5,5-Diarylhydantoins

: A new synthetic route to phenytoin and 5,5-diarylhydantoins is reported. Parabanic acid is converted to the 5,5-diarylhydantoins (65-98% yield) from CF 3 SO 3 H and arenes. Deuterium substituted products are prepared in high yield from parabanic acid, CF 3 SO 3 D

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