Enantiopure 1,2,3-Triazolyl-β-amino Acids via Click Cycloaddition Reaction on Racemic Alkynyl Precursors Followed by Separation of Stereoisomers
Margarita Escudero-Casao, Alberto Vega-Penaloza and Eusebio Juaristi
Affiliation: Departamento de Quimica, Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional, Apartado Postal 14-740, 07000 Mexico D. F., Mexico.
Keywords: Triazol, click-reaction, β-amino acids, peptidomimetics, enantio- and diastereoseparation.
In recent years, peptidomimetics have gained enormous importance in drug design aiming to achieve increased
drug metabolic stability and higher selectivity. In the field of peptidomimetics, β-peptides incorporating β2- and β3-amino
acids (the higher homologs of natural α-amino acids) provide a powerful method for the synthesis of peptidomimetics
with particular secondary structures. In this regard, 1,2,3-triazole-modified peptidomimetics can act as effective peptide
surrogates, and therefore have gained considerable attention. In the present report, 1,4-disubstituted 1,2,3-triazoles attached
to β-amino acids were prepared selectively from the corresponding alkynyl-β2-amino acids according to Huisgen’s
copper-catalyzed 1,3-dipolar cycloaddition (CuAAC), under mild conditions and with very high efficiency. Different azide
derivatives, including some incorporating α-amino acids, were employed in this cycloaddition reaction. The enantiopure
compounds were obtained via diastereomeric salt formation with chiral adjuvants, and subsequent separation.
Rights & PermissionsPrintExport