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Acid Derivative Enolates

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    22900
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    enolate pkas.png

    These enolates provide the following synthetic utility.

    synthetic utility.png

    What should X be?

    1. Should confer high reactivity
    2. Should be cleavable under specific conditions
    3. Should induce asymmetry. (Malonates are more convenient for systems that do not require asymmetry).

    Two of the most widely used are the Evans Oxazolidinone and the Myer's auxiliary.

    auxiliaries.png

    The Evans oxazolidinone is useful for asymmetric alkylations

    .Evans alkylation.png

    The oxazolidinone can be removed in several ways to provide different functionality.

    Evans cleavage.png

    The Myers Auxiliary provides a more reactive enolate that can reactive with electrophiles that do not react with the imide auxiliary.Myers alkylation.png

    J. Am. Chem. Soc., 1994, 116, 9361–9362.

    The Myers Auxilary can also be cleaved by a variety of conditions.

    Myers Cleavage.png


    Acid Derivative Enolates is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.

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