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Synthesis and Structure−Activity Correlation of Natural-Product Inspired Cyclodepsipeptides Stabilizing F-Actin

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Max-Planck-Institut für molekulare Physiologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany, and Technische Universität Dortmund Fakultät Chemie, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
Cite this: J. Am. Chem. Soc. 2010, 132, 9, 3063–3077
Publication Date (Web):February 11, 2010
https://doi.org/10.1021/ja9095126
Copyright © 2010 American Chemical Society

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    Abstract

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    The fundamental role played by actin in the regulation of eukaryotic cell maintenance and motility renders it a primary target for small-molecule intervention. In this arena, a class of potent cytotoxic cyclodepsipeptide natural products has emerged over the last quarter-century to stimulate the fields of biology and chemistry with their unique actin-stabilizing properties and complex peptide−polyketide hybrid structures. Despite considerable research effort, a structural basis for the activity of these secondary metabolites remains elusive, not least for the lack of high-resolution structural data and a reliable synthetic route to diverse compound libraries. In response to this, an efficient solid-phase approach has been developed and successfully applied to the total synthesis of jasplakinolide and chondramide C and diverse analogues. The key macrocylization step was realized using ruthenium-catalyzed ring-closing metathesis (RCM) that in the course of a library synthesis produced discernible trends in metathesis reactivity and E/Z-selectivity. After optimization, the RCM step could be operated under mild conditions, a result that promises to facilitate the synthesis of more extensive analogue libraries for structure−function studies. The growth inhibitory effects of the synthesized compounds were quantified and structure−activity correlations established which appear to be in good alignment with relevant biological data from natural products. In this way a number of potent unnatural and simplified analogues have been found. Furthermore, potentially important stereochemical and structural components of a common pharmacophore have been identified and rationalized using molecular modeling. These data will guide in-depth mode-of-action studies, especially into the relationship between the cytotoxicity of these compounds and their actin-perturbing properties, and should inform the future design of simplified and functionalized actin stabilizers as well.

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    Detailed experimental (synthetic and cell screening) procedures, comprehensive compound characterization, including copies of 1H NMR and 13C NMR spectral data, molecular modeling data, additional graphical representation and numbering convention for peptide diene 23n and macrocyclic structures E-28a, Z-28a, E-29a, Z-29a, E-30c, and E-31c. This material is available free of charge via the Internet at http://pubs.acs.org.

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