The partial
de novo synthesis of two new C-disaccharides containing
d-glucosamine is described. The strategy is based on a hetero-Diels–Alder reaction leading to a 1:1 mixture of separable cycloadducts, which have been stereoselectively functionalized and converted into
![greek small letter alpha greek small letter alpha](http://www.sciencedirect.com/scidirimg/entities/204e.gif)
-
d-Gal
p-(1→3)-
C-
d-Glc
pNAc and
![greek small letter alpha greek small letter alpha](http://www.sciencedirect.com/scidirimg/entities/204e.gif)
-
l-Gal
p-(1→3)-
C-
d-Glc
pNAc.