Synthesis of a trihydroxylated azepane from d-arabinose by way of an intramolecular alkene nitrone cycloaddition
摘要:
The synthesis of 1,6-imino-1,5,6-trideoxy-(L)-xylo-hexitol, a trihydroxylated azepane, from (D)-arabinose was achieved by way of an intramolecular alkene nitrone cycloaddition. The final product as well as its bicyclic precursor, (3R,4S,5S)-3,4-dihydroxy-8-oxa-1-azabicyclo[3.2.1]octane, were evaluated as glycosidase inhibitors. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of difluorinated carbocyclic analogues of 5-deoxypentofuranoses and 1-amino-5-deoxypentofuranoses: en route to fluorinated carbanucleosides
摘要:
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.
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.