Abstract
Abstract The synthesis of biologically relevant glycosylamino acids using a non-natural amino acid as the glycosyl acceptor is described. The glycosylation reaction of a monosaccharide tri-chloroacetimidate donor with Fmoc- l -hydroxynorleucine benzyl ester provided the α-O-linked product. Conversely, when the glycosylation reaction was carried out with a glycal epoxide donor, the β-O-linked product predominated. We have used these two complementary glycosylation reactions to synthesize five different glycosylamino acids, each containing the Tn, TF, STn, Lewisy or Globo-H tumor-associated carbohydrate antigens.
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