The Unique Reactivity of Conformationally Restricted Pyranosides

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The pyranosides with 2, 3-trans carbamate group anomerized from theβ-to theα-direction under mild acidic conditions. The bond between anomeric carbon and internal oxygen is cleaved and re-cyclized. The generated linear cation is trapped in order to show the evidence of the cleavage pattern. After investigation of the substitutent effect, acetyl group on nitrogen of the carbamate group show the significant effect on the anomerization reaction. Furthermore, the high 1, 2-cis radical C-glycosylation reaction was achieved with pyranosides 2, 3-trans carbamate group.