(1R)-(+)-camphor and acetone derived alpha'-hydroxy enones in asymmetric Diels-Alder reaction: catalytic activation by Lewis and Brønsted acids, substrate scope, applications in syntheses, and mechanistic studies

The Journal of Organic Chemistry
Patricia BañuelosJesús Razkin

Abstract

The Diels-Alder reaction constitutes one of the most powerful and convergent C-C bond-forming transformations and continues to be the privileged route to access cyclohexene substructures, which are widespread within natural products and bioactive constituents. Over the recent years, asymmetric catalytic Diels-Alder methodologies have experienced a tremendous advance, but still inherently difficult diene-dienophile combinations prevail, such as those involving dienes less reactive than cyclopentadiene or dienophiles like beta-substituted acrylates and equivalents. Here the main features of alpha'-hydroxy enones as reaction partners of the Diels-Alder reaction are shown, with especial focus on their potentials and limitations in solving the above difficult cases. Alpha'-hydroxy enones are able to bind reversibly to both Lewis acids and Brønsted acids, forming 1,4-coordinated species that are shown to efficiently engage in these inherently difficult Diels-Alder reactions. On these bases, a convenient control of the reaction stereocontrol can be achieved using a camphor-derived chiral alpha'-hydroxy enone model (substrate-controlled asymmetric induction) and either Lewis acid or Brønsted acid catalysis. Complementing this approach,...Continue Reading

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Jan 13, 2016·Organic Letters·Lei GaoXiaoguang Lei
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