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Título: | Stereoselective 1,3-dipolar cycloadditions of nitrones derived from amino acids. Asymmetric synthesis of N-(alkoxycarbonylmethyl)-3-hydroxypyrrolidin-2-ones |
Autor: | Merino, Pedro CSIC ORCID ; Greco, Graziella; Tejero, Tomás CSIC ORCID; Hurtado-Guerrero, Ramón CSIC ORCID; Matute, Rosa; Chiacchio, Ugo; Corsaro, Antonio; Pistarà, Venerando; Romeo, Roberto | Palabras clave: | Pyrrolidines Isoxazolidines Nitrones |
Fecha de publicación: | 2013 | Editor: | Elsevier | Citación: | Tetrahedron 69(45): 9381-9390 (2013) | Resumen: | Diastereoselective asymmetric 1,3-dipolar cycloadditions of N-(alkoxycarbonylmethyl) nitrones derived from glycine, alanine and phenylalanine have been studied both experimentally and theoretically. Asymmetric induction is evaluated by either introducing a chiral group at the nitrone nitrogen atom or by using Oppolzer's sultam acrylamide. In both cases the sense of the asymmetric induction is the same, the (3R,5R)-isomer being preferentially obtained. The best results were observed with the chiral dipolarophile, which afforded an only isomer in all cases. The obtained isoxazolidines are easily transformed into the corresponding 5-substituted-3-hydroxypyrrolidin-2-ones. DFT studies are in a qualitative agreement with the observed experimental results. © 2013 Elsevier Ltd. All rights reserved. | URI: | http://hdl.handle.net/10261/111453 | DOI: | 10.1016/j.tet.2013.08.084 | Identificadores: | doi: 10.1016/j.tet.2013.08.084 issn: 0040-4020 |
Aparece en las colecciones: | (ISQCH) Artículos |
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