C-Glycosides of 2-Amino-2-deoxy Sugars. β-C-Glycosides and 1,1-Disubstituted Variants

[reaction: see text] C(1)-Substituted anomeric selenides, derived from azidoselenation of C(1)-methylated glycals, provide access to anomeric radical reactivity that has been used to generate beta-C-glycosides and 1,1-disubstituted C-glycosides based on galacto, gluco, and manno variants of N-acetyl-2-amino sugars.