Brønsted Acid-Promoted Glycosylations of Disaccharide Glycal Substructures of the Saccharomicins
作者:Bradley R. Balthaser、Frank E. McDonald
DOI:10.1021/ol901923x
日期:2009.11.5
An acid-promoted glycosylation and alkynol cycloisomerization sequence provided direct access to the 2-deoxytrisaccharide corresponding to the fucose-saccharosamine-digitoxose substructure of saccharomicin B. In the course of this work, the absolute stereochemistry of the repeating fucose-saccharosamine disaccharide of saccharomicins was also confirmed.
Stereoselective Synthesis of <scp>l</scp>-Oliose Trisaccharide via Iterative Alkynol Cycloisomerization and Acid-Catalyzed Glycosylation
作者:Frank E. McDonald、Minglang Wu
DOI:10.1021/ol026886o
日期:2002.10.1
[GRAPHICS]The synthesis of an all-alpha L-Oliose diastereomer of digitoxin provides valuable insights into the generality and protective-group dependence of acid-catalyzed glycosylations of glycals to 2-deoxycarbohydrates.