Hybrid theory: 1,2-Cyclopropanecarboxylated sugars were used as glycosyl donors for the first time in the synthesis of 2-C-branched oligo(glyco–amino acid)s (OGAAs; see scheme) decorated with α-amino acids. The method was applied to an acceptor-reactivity-based stereo- and regioselective glycosylation reaction towards the preparation of several disaccharide-derived glyco–amino acid derivatives.
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