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Issue 9, 2015
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The enantioselective construction of tetracyclic diterpene skeletons with Friedel–Crafts alkylation and palladium-catalyzed cycloalkenylation reactions

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Abstract

Due to the profound extent to which natural products inspire medicinal chemists in drug discovery, there is demand for innovative syntheses of these often complex materials. This article describes the synthesis of tricarbocyclic natural product architectures through an extension of the enantioselective Birch–Cope sequence with intramolecular Friedel–Crafts alkylation reactions. Additionally, palladium-catalyzed enol silane cycloalkenylation of the tricarbocyclic structures afforded the challenging bicyclo[3.2.1]octane C/D ring system found in the gibberellins and the ent-kauranes, two natural products with diverse medicinal value. In the case of the ent-kaurane derivative, an unprecedented alkene rearrangement converted four alkene isomers to one final product.

Graphical abstract: The enantioselective construction of tetracyclic diterpene skeletons with Friedel–Crafts alkylation and palladium-catalyzed cycloalkenylation reactions

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Publication details

The article was received on 26 Nov 2014, accepted on 05 Jan 2015 and first published on 05 Jan 2015


Article type: Paper
DOI: 10.1039/C4OB02489C
Author version available: Download Author version (PDF)
Citation: Org. Biomol. Chem., 2015,13, 2726-2744
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    The enantioselective construction of tetracyclic diterpene skeletons with Friedel–Crafts alkylation and palladium-catalyzed cycloalkenylation reactions

    S. J. Burke, W. P. Malachowski, S. K. Mehta and R. Appenteng, Org. Biomol. Chem., 2015, 13, 2726
    DOI: 10.1039/C4OB02489C

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