A Synthesis of Carbasugar-Sugar Pseudodisaccharides via a Cycloaddition-Cycloreversion Reaction of 2H-Pyran-2-ones

[摘要]：Cycloaddition of 3-carbomethoxy-2h-pyran-2-one to a vinylated sugar followed by the loss of bridging CO2 from the cycloadduct affords a cyclohexadiene which can be manipulated to a carbasugar-sugar pseudodisaccharide.

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