Structural analogs of swainsonine and castanospermine have been synthe
sized using [4+2] cycloadditions of chiral azomethines with Danishefsk
y diene. Similar hydroxyindolizidines were prepared by [3+2] dipolar c
ycloadditions of sugar derived cyclic nitrones with methyl acrylate. S
tereoselectivity of [2+2] photocycloadditions of uridine derivatives w
as also studied.