Synthesis of Waixenicin A: Exploring Strategies for Nine‐Membered Ring Formation

Abstract: We present a comprehensive account on our efforts behind the recently published synthesis of waixenicin A. Our approach for constructing the dihydropyran ring relied on an Achmatowicz rearrangement. For the assembly of the nine‐membered ring, four distinct strategies were investigated. Our initial attempts using radical‐based addition/fragmentation reactions targeting the C7−C11 bond proved unsuitable for accessing the 6/9‐bicycle. By employing anionic fragmentation conditions at the furfuryl alcohol stage, we successfully reached a 5/9‐bicycle. However, subsequent ring‐expansion was unsuccessful. Alternative approaches, such as Nozaki–Hiyama–Kishi or Heck reactions to connect the C6−C7 bond, also encountered difficulties, with no nine‐membered ring formation observed. Our first breakthrough came from our attempts to install the C5−C6 bond via an intramolecular alkylation. Surprisingly, subsequent functional group modifications proved unexpectedly challenging, necessitating a redesign of our synthetic route. Drawing from all our investigations, we concluded that construction of the C9−C10 bond would enable efficient nine‐membered ring alkylation and would facilitate the installation of the desired substitution pattern along the southern periphery. Exploration of this strategy yielded further surprises but ultimately led to the successful synthesis of waixenicin A and 9‐deacetoxy‐14,15‐deepoxyxeniculin. For the latter compound, a bioinspired one‐step rearrangement to xeniafauranol A was achieved.

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Synthesis of Waixenicin A: Exploring Strategies for Nine‐Membered Ring Formation ; day:13 ; month:12 ; year:2023 ; extent:17
Chemistry - a European journal ; (13.12.2023) (gesamt 17)

Urheber
Steinborn, Christian
Huber, Tatjana
Lichtenegger, Julian
Plangger, Immanuel
Höfler, Denis
Schnell, Simon D.
Weisheit, Lara
Mayer, Peter
Wurst, Klaus
Magauer, Thomas

DOI
10.1002/chem.202303489
URN
urn:nbn:de:101:1-2023121414030033816086
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
15.08.2025, 07:23 MESZ

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Beteiligte

  • Steinborn, Christian
  • Huber, Tatjana
  • Lichtenegger, Julian
  • Plangger, Immanuel
  • Höfler, Denis
  • Schnell, Simon D.
  • Weisheit, Lara
  • Mayer, Peter
  • Wurst, Klaus
  • Magauer, Thomas

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