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Under control: Lewis acids induce an unexpected rearrangement of 1,3-dioxolanyl-substituted 1,2-oxazines to provide bicyclic compounds in a stereocontrolled manner. They are precursors for enantiopure carbohydrate mimetics containing 3-aminotetrahydropyran or 4-aminooxepane substructures (see scheme; Bn=benzyl).
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Al‐Harrasi et al. (2005) studied this question.
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