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Título: | Synthesis and structural characterization of pyrimidine bi- and tricyclic nucleosides with sugar puckers conformationally locked into the eastern region of the pseudorotational cycle |
Autor: | Chamorro, Cristina CSIC; Luengo, Santos M.; Bonache, María-Cruz CSIC; Velázquez, Sonsoles CSIC ORCID CVN; Peréz-Pérez, María-Jesús CSIC ORCID ; Camarasa Rius, María José CSIC ORCID; Gago, Federico CSIC ORCID; Jimeno, M. Luisa CSIC ORCID; San-Félix, Ana CSIC ORCID | Fecha de publicación: | 2003 | Editor: | American Chemical Society | Citación: | Journal of Organic Chemistry 68 : 6695-6704 (2003) | Resumen: | Reaction 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 editor: | http://dx.doi.org/10.1021/jo034088l | URI: | 10261/34938 | DOI: | 10.1021/jo034088l | ISSN: | 0022-3263 |
Aparece en las colecciones: | (CENQUIOR) Artículos (IQM) Artículos |
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