Introduction of a New Stereocenter on C1-Functionalized 8-Oxabicyclo[3.2.1] oct-6-en 3-ones by a Regio- and Stereoselective Electrophilic Addition. Obtention of Polyfunctionalized Cycloheptanes with Five Stereocenters

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Abstract:

A methodology to obtain polyfunctionalized cycloheptane synthons, with five stereocenters, is presented. The precursors are C1-functionalized 8-oxabicyclo[3.2.1]oct-6-en-3-ones, obtained by a [4+3] cycloaddition reaction. The stereoselective reduction of the carbonyl group on C3 of these cycloadducts, followed by an electrophilic addition of organic acids on the C6-C7 double bond, under controlled conditions, allows the introduction of a new stereocenters on C6. The introduction of this new substituent on C6 takes place in a regio- and stereoselective way by a preferential exo attack on the oxabicyclic substrates. This synthetic methodology is versatile enough to allow the preparation of a wide variety of polypropionate building blocks, with applications to the synthesis of natural products with biological interest.

Keywords: cycloaddition reaction; cycloheptane synthons; electrophilic addition; oxabicyclo oct-en-one

Document Type: Review Article

DOI: http://dx.doi.org/10.2174/1570178054405977

Affiliations: Departamento de Quimica Organica, Universidad de Barcelona, c/ Martí i Franques 1-11, 08028-Barcelona, Spain.

Publication date: August 1, 2005

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  • Letters in Organic Chemistry publishes original letters on all areas of organic chemistry including synthesis, bioorganic, medicinal, natural products, organometallic, supramolecular, molecular recognition and physical organic chemistry. The emphasis is placed on publishing quality papers very rapidly. Letters are processed rapidly and take full advantage of the Internet technology both for the submission and the review of the manuscripts.
    The journal is essential reading for all organic chemists both in academia and industry.
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