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Enantioselective Total Synthesis and Structural Revision of Dysiherbol A

A 12‐step total synthesis of the natural product dysiherbol A, a strongly anti‐inflammatory and anti‐tumor avarane meroterpene isolated from the marine sponge Dysidea sp., was elaborated. As key steps, the synthesis features an enantioselective Cu‐catalyzed 1,4‐addition/enolate‐trapping opening move...

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Autores principales: Baars, Julian, Grimm, Isabelle, Blunk, Dirk, Neudörfl, Jörg‐Martin, Schmalz, Hans‐Günther
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8251742/
https://www.ncbi.nlm.nih.gov/pubmed/33978302
http://dx.doi.org/10.1002/anie.202105733
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author Baars, Julian
Grimm, Isabelle
Blunk, Dirk
Neudörfl, Jörg‐Martin
Schmalz, Hans‐Günther
author_facet Baars, Julian
Grimm, Isabelle
Blunk, Dirk
Neudörfl, Jörg‐Martin
Schmalz, Hans‐Günther
author_sort Baars, Julian
collection PubMed
description A 12‐step total synthesis of the natural product dysiherbol A, a strongly anti‐inflammatory and anti‐tumor avarane meroterpene isolated from the marine sponge Dysidea sp., was elaborated. As key steps, the synthesis features an enantioselective Cu‐catalyzed 1,4‐addition/enolate‐trapping opening move, an Au‐catalyzed double cyclization to build up the tetracyclic core‐carbon skeleton, and a late installation of the C5‐bridgehead methyl group via proton‐induced cyclopropane opening associated with spontaneous cyclic ether formation. The obtained pentacyclic compound (corresponding to an anhydride of the originally suggested structure for dysiherbol A) showed identical spectroscopic data as the natural product, but an opposite molecular rotation. CD‐spectroscopic measurements finally confirmed that both the constitution and the absolute configuration of the originally proposed structure of (+)‐dysiherbol A need to be revised.
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spelling pubmed-82517422021-07-07 Enantioselective Total Synthesis and Structural Revision of Dysiherbol A Baars, Julian Grimm, Isabelle Blunk, Dirk Neudörfl, Jörg‐Martin Schmalz, Hans‐Günther Angew Chem Int Ed Engl Communications A 12‐step total synthesis of the natural product dysiherbol A, a strongly anti‐inflammatory and anti‐tumor avarane meroterpene isolated from the marine sponge Dysidea sp., was elaborated. As key steps, the synthesis features an enantioselective Cu‐catalyzed 1,4‐addition/enolate‐trapping opening move, an Au‐catalyzed double cyclization to build up the tetracyclic core‐carbon skeleton, and a late installation of the C5‐bridgehead methyl group via proton‐induced cyclopropane opening associated with spontaneous cyclic ether formation. The obtained pentacyclic compound (corresponding to an anhydride of the originally suggested structure for dysiherbol A) showed identical spectroscopic data as the natural product, but an opposite molecular rotation. CD‐spectroscopic measurements finally confirmed that both the constitution and the absolute configuration of the originally proposed structure of (+)‐dysiherbol A need to be revised. John Wiley and Sons Inc. 2021-06-01 2021-06-25 /pmc/articles/PMC8251742/ /pubmed/33978302 http://dx.doi.org/10.1002/anie.202105733 Text en © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Communications
Baars, Julian
Grimm, Isabelle
Blunk, Dirk
Neudörfl, Jörg‐Martin
Schmalz, Hans‐Günther
Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
title Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
title_full Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
title_fullStr Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
title_full_unstemmed Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
title_short Enantioselective Total Synthesis and Structural Revision of Dysiherbol A
title_sort enantioselective total synthesis and structural revision of dysiherbol a
topic Communications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8251742/
https://www.ncbi.nlm.nih.gov/pubmed/33978302
http://dx.doi.org/10.1002/anie.202105733
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