Selective radical synthesis of β- C -disaccharides
摘要:
Several P-C-disaccharides have been selectively synthesized by radical cyclization of two temporarily tethered functionalized monosaccharides. In this process, intramolecular addition of a carbohydrate-derived radical onto an anomeric exomethylene group, followed by axial hydrogen addition, resulted in beta stereochemistry. (C) 2001 Published by Elsevier Science Ltd.
The C-disaccharide analogue of the sequence β-D-Galf-(1→3)-β-D-Glcp, an internal disaccharide of the capsular polysaccharide of Klebsiella K14 was synthesized by radical macrocyclization of temporarily tethered monosaccharides. The α-difluoro-C-analogue was obtained in three steps from D-galactono-1,4-lactone.