Synthesis of difluorinated carbocyclic analogues of 5-deoxypentofuranoses
作者:Gaëlle Fourrière、Jérôme Lalot、Nathalie Van Hijfte、Jean-Charles Quirion、Eric Leclerc
DOI:10.1016/j.tetlet.2009.09.170
日期:2009.12
The synthesis of difluorinated carbocyclicanalogues of 5-deoxypentofuranoses is described. The sequence involves an addition of PhSeCF2TMS to carbohydrate-derived aldehydes followed by a radical cyclization, and provides a secure strategy for a future synthesis of pentofuranoses and nucleoside analogues.
Synthesis of difluorinated carbocyclic analogues of 5-deoxypentofuranoses and 1-amino-5-deoxypentofuranoses: en route to fluorinated carbanucleosides
作者:Gaëlle Fourrière、Nathalie Van Hijfte、Jérôme Lalot、Guy Dutech、Bruno Fragnet、Gaël Coadou、Jean-Charles Quirion、Eric Leclerc
DOI:10.1016/j.tet.2010.03.079
日期:2010.5
The synthesis of difluorinated carbocyclic analogues of 5-deoxypentofuranoses and 1-amino-5-deoxypentofuranoses is described. The sequence involves an addition of PhSeCF2TMS to carbohydrate-derived aldehydes or their corresponding tert-butanesulfinylimines followed by a radical cyclization. Optimized conditions for the PhSeCF2TMS addition to alpha-chiral aldehydes have been disclosed and its unusual diastereoselectivity is discussed. Application of the sequence using Ellman's auxiliary allows a more direct access to 1-aminopentose analogues with a complete control of the pseudo-anomeric center configuration. (C) 2010 Elsevier Ltd. All rights reserved.