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Conversion of a sugar to a δ,ε-unsaturated aldehyde, and subsequent condensation of the aldehyde moiety with BnNHNHCO2Et, yields the respective azomethine imine intermediate dipole which adds intramolecularly to the existing double bond, thus generating a bicyclic adduct with high diastereoselectivity.
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Gallos et al. (1997) studied this question.
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