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Synlett 1996; 1996(3): 189-200
DOI: 10.1055/s-1996-5366
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Azasugar Syntheses and Multistep Cascade Rearrangements via Hetero Diels-Alder Cycloadditions with Nitroso Dienophiles

Jacques Streith* , Albert Defoin
  • *Ecole Nationale Supérieure de Chimie, Université de Haute-Alsace, 3, rue Alfred Werner, F-68093 MULHOUSE CEDEX, FRANCE, FAX: 33 89 59 98 59
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Publication Date:
31 December 2000 (online)

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Hetero Diels-Alder (HDA) reactions with nitroso dienophiles R-N=0 are shown to represent the key step in the stereospecific total synthesis of azasugar derivatives. A series of amino-deoxysugars, both racemic and chiral, have been prepared from the primary cycloadducts of such HDA-reactions. Asymmetric induction during these cycloadditions were achieved either with chiral dienes, or with chiral nitroso dienophiles. In some instances the primary HDA cycloadducts underwent spontaneous cascading rearrangements to thermodynamically more stable entities. These rearrangements were triggered off by the breaking at r.t. of the weak N-O single bond.

hetero Diels-Alder - nitroso dienophiles - asymmetric induction - cascading rearrangements - azasugars

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