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DOI: 10.1055/s-0040-1706993
Asymmetric Total Synthesis of (+)-Waihoensene
Publication History
Publication Date:
15 May 2020 (online)
Key words
(+)-waihoensene - Conia-ene reaction - Pauson−Khand reaction - Wittig olefination - intramolecular HAT reaction![](https://www.thieme-connect.de/media/synfacts/202006/i_c023_s1_10-1055_s-0040-1706993.gif)
Significance
Huang, Yang, and co-workers report the asymmetric synthesis of (+)-waihoensene in 15 steps. Waihoensene features a congested [6,5,5,5] tetracyclic core, containing four contiguous quaternary carbons and a cis-fused six-membered ring.
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Comment
In five steps, enone A is transformed into G, which undergoes diastereoselective Conia-ene reaction to H. Enyne H is elaborated to J through a Pauson–Khand reaction, followed by a nickel-catalyzed 1,4-addition. Reduction of the exocyclic double bond is achieved by Fe(acac)3/PhSiH3-mediated intramolecular HAT reaction to give N. Shortly after the publication of this synthesis, Snyder and co-workers reported another synthesis of this natural product following a very similar strategy (Angew. Chem. Int. Ed. 2020, DOI: 10.1002/anie.202004177).
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![](https://www.thieme-connect.de/media/synfacts/202006/i_c023_s1_10-1055_s-0040-1706993.gif)