Stereoselective Entry to β-Linked C-Disaccharides Using a Carbon-Ferrier Reaction

The synthesis of unsaturated β-linked C-disaccharides by the Lewis acid-mediated reaction of 3-O-acetylated glycals with monosaccharide-derived alkenes is described. Deprotection and selective hydrogenation of an exocyclic carbon−carbon double, in the presence of an endocyclic double bond, for representative targets is also illustrated.