Systematic synthesis and biological evaluation of .alpha.- and .beta.-D-xylofuranosyl nucleosides of the five naturally occurring bases in nucleic acids and related analogs
作者:Gilles Gosselin、Marie Christine Bergogne、Jean De Rudder、Erik De Clercq、Jean Louis Imbach
DOI:10.1021/jm00152a007
日期:1986.2
anomers were obtained by a multistep synthesis with use of 2-amino- or 2-mercapto-alpha-D-xylofuran[1',2':4,5]-2-oxazoline as starting material. The xylofuranosyl nucleosides were tested for their activity against a variety of RNA and DNA viruses and for inhibition of cell growth and macromolecule synthesis. Three compounds, 9-(beta-D-xylofuranosyl)adenine, 9-(beta-D-xylofuranosyl)guanine, and 1-(
Oxazolinethiones and Oxazolidinethiones for the First Copper-Catalyzed Desulfurative Cross-Coupling Reaction and First Sonogashira Applications
作者:Sandrina Silva、Balla Sylla、Franck Suzenet、Arnaud Tatibouët、Amelia P. Rauter、Patrick Rollin
DOI:10.1021/ol703003e
日期:2008.3.1
chiral oxazolidinethiones (OZT) and aromatic oxazolinethiones (OXT), were involved, for the first time, in Sonogashiracross-coupling. A cooperative effect of two different copper (I) species-CuI and CuTC-accounts for this new copper-catalyzed desulfurative carbon-carbon cross-couplingreaction. This cooperative reactivity could also be extended to other copper (I) catalysts.
The synthesis of unprecedented bicyclic oxazolidin‐2‐one (OZO) fused iminosugars is described. The key step involves a tandem Staudinger/retro Michael/aza Michael sequence from OZO azidosugars, themselves obtained through oxidation of oxazolidin‐2‐thione (OZT) precursors. The iminosugars were subsequently evaluated as glycosidaseinhibitors.
Unprotected carbohydrates can readily be converted into base-modified nucleosides and deoxynucleosides through a short sequence involving the condensation of anthranilic acid derivatives with a suitably protected sugar-derived 2-alkylthio-1,3-oxazoline. (C) 2004 Elsevier Ltd. All rights reserved.