Pseudoephedrine-Directed Asymmetric α-Arylation of α-Amino Acid Derivatives
作者:Rachel C. Atkinson、Fernando Fernández-Nieto、Josep Mas Roselló、Jonathan Clayden
DOI:10.1002/anie.201502569
日期:2015.7.27
Available α‐amino acids undergo arylation at their α position in an enantioselective manner on treatment with base of N′‐aryl urea derivatives ligated to pseudoephedrine as a chiral auxiliary. In situ silylation and enolization induces diastereoselective migration of the N′‐aryl group to the α position of the amino acid, followed by ring closure to a hydantoin with concomitant explulsion of the recyclable
作者:Rachel C. Atkinson、Daniel J. Leonard、Julien Maury、Daniele Castagnolo、Nicole Volz、Jonathan Clayden
DOI:10.1039/c3cc46193a
日期:——
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.