Artículo
Reaction between N-alkylhydroxylamines and chiral enoate esters: More experimental evidence for a cycloaddition-like process, a rationale based on DFT theoretical calculations, and stereoselective synthesis of new enantiopure β-amino acids
Moglioni, Albertina Gladys
; Muray, Elena; Castillo, José A.; Álvarez Larena, Ángel; Moltrasio, Graciela Y.; Branchadell, Vicenç; Ortuño, Rosa M.
Fecha de publicación:
12/2002
Editorial:
American Chemical Society
Revista:
Journal of Organic Chemistry
ISSN:
0022-3263
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The reactions between N-benzyl- and N-methylhydroxylamine and chiral enoate esters, derived from D-glyceraldehyde and (-)-verbenone, respectively, have been investigated. Theoretical calculations show that the most favorable mechanism involves the concerted cycloaddition of the hydroxylamine to the substrate. This result is in good agreement with the stereospecificity observed when the trisubstituted olefins are used. The open-chain adducts have been isolated when the processes are carried out at low temperatures and for short reaction times. These compounds evolve to the corresponding isoxazolidinones on standing at room temperature or under acid catalysis. The high π-facial diastereoselection has been rationalized on the basis of steric effects induced by the dioxolane ring for D-glyceraldehyde derivatives or by the cyclobutane gem-dimethyl substitution for esters prepared from (-)-verbenone. As an application of these reactions, new β-amino acids have been synthesized in a highly efficient and stereocontrolled manner.
Palabras clave:
(-)-verbenone
,
chiral enoate esters
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Articulos(OCA HOUSSAY)
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA HOUSSAY
Articulos de OFICINA DE COORDINACION ADMINISTRATIVA HOUSSAY
Citación
Moglioni, Albertina Gladys; Muray, Elena; Castillo, José A.; Álvarez Larena, Ángel; Moltrasio, Graciela Y.; et al.; Reaction between N-alkylhydroxylamines and chiral enoate esters: More experimental evidence for a cycloaddition-like process, a rationale based on DFT theoretical calculations, and stereoselective synthesis of new enantiopure β-amino acids; American Chemical Society; Journal of Organic Chemistry; 67; 8; 12-2002; 2402-2410
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