Fully benzylated or benzoylated phenyl selenoglycosides can be activat
ed by the promoters iodonium di-sym-collidine perchlorate (IDCP) or N-
iodosuccinimide and catalytic triflic acid (NIS/TfOH). The potential o
f the iodonium ion-mediated glycosylations with phenyl selenoglycoside
s is illustrated in the chemoselective synthesis of 1,2-cis- and 1,2-t
rans linked disaccharides.