English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/34938

Synthesis and structural characterization of pyrimidine bi- and tricyclic nucleosides with sugar puckers conformationally locked into the eastern region of the pseudorotational cycle

AutorChamorro, Cristina; Luengo, Santos M.; Bonache, María-Cruz ; Velázquez, Sonsoles ; Pérez Pérez, María Jesús; Camarasa Rius, María José ; Gago, Federico ; Jimeno, M. Luisa ; San-Félix, Ana
Fecha de publicación2003
EditorAmerican Chemical Society
CitaciónJournal of Organic Chemistry 68 : 6695-6704 (2003)
ResumenReaction of 5¢-O-tosyl TSAO-m3T (1) with amines has led to the synthesis of new classes of bi- and tricyclic nucleosides. Full details about the synthesis of these compounds and a plausible mechanism to explain their obtention are reported. In addition, we describe the development of a second, more efficient, and higher yielding synthetic route as a general approach for the synthesis of some of these bicyclic nucleosides. To study the conformational behavior of the bi- and tricyclic nucleosides described in this paper, intensive NMR investigations and molecular modeling studies were performed. Conformational analysis indicates that the furanose ring of the compounds described here prefers the eastern side of the pseudorotation cycle with the base substituents preferentially in the anti range. The torsion angle ç describing the C-4¢-C-5¢ bond is found to prefer the +sc range. These compounds represent a novel class of E-type conformationally restricted bicyclic ribonucleosides containing a [3.3.0]-fused carbohydrate moiety. The bicyclic nucleosides described herein present an interesting potential for diverse and selective chemical treatments on the 2¢-hydroxyl and/or the functionalities incorporated at the bridge between C-3¢ and C-5¢.
Versión del editorhttp://dx.doi.org/10.1021/jo034088l
Aparece en las colecciones: (CENQUIOR) Artículos
(IQM) Artículos
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.