Dianionic enolates formed from N′-aryl urea derivatives of amino acids undergo intramolecular C-arylation by attack of the enolate anion on the N′-aryl ring, leading to a hydantoin derivative of a quaternary amino acid. In situ IR studies allow identification of four intermediates on the reaction pathway.
R. C. Atkinson, D. J. Leonard, J. Maury, D. Castagnolo, N. Volz and J. Clayden, Chem. Commun., 2013, 49, 9734 DOI: 10.1039/C3CC46193A
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