Bridgehead Epoxide Iso-Euphoranin E from β-Caryophyllene Oxide via Sequential Cationic Formation and Scission of [4.3.2]Propellane
Organic Chemistry Frontiers 2024
Georgijs Stakanovs, Dace Rasiņa, Sergejs Beļakovs, Artis Kinēns, Aigars Jirgensons

The development of Gassman's Lewis-acid-catalyzed [2 + 2] cycloaddition in (−)-β-caryophyllene-oxide-derived naturally occurring enone 8 represent a missing link connecting 8 with the natural [4.3.2]propellane-containing alcohol 9. Further chemical transformations involving propellane 9 established a route toward bridgehead epoxide iso-euphoranin E (11), which was found to be a diastereomer of the natural product euphoranin E (2) isolated from Euphorbia wangii. DFT calculations were performed to explain the observed stereoselectivities of the solvolysis of key mesylate 15 to form the euphoranin E core and [2 + 2] cycloaddition in enone 8 to form precursor 9 of iso-euphoranin E (11). The presented research expands the chemical space around caryophyllane-type sesquiterpenoids containing bridgehead motifs.


DOI
10.1039/d4qo00940a
Hipersaite
https://pubs.rsc.org/en/content/articlelanding/2024/qo/d4qo00940a

Stakanovs, G., Rasiņa, D., Beļakovs, S., Kinēns, A., Jirgensons, A. Bridgehead Epoxide Iso-Euphoranin E from β-Caryophyllene Oxide via Sequential Cationic Formation and Scission of [4.3.2]Propellane. Organic Chemistry Frontiers, 2024, Vol. 11, No. 18, 5086.-5092.lpp. ISSN 2052-4110. Pieejams: doi:10.1039/d4qo00940a

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