CASE-DFT Structure Elucidation of Proton-Deficient Chlorodepsidones from the Indonesian Lichen Teloschistes flavicans and Structure Revision of Flavicansone - Archive ouverte HAL
Article Dans Une Revue Journal of Natural Products Année : 2024

CASE-DFT Structure Elucidation of Proton-Deficient Chlorodepsidones from the Indonesian Lichen Teloschistes flavicans and Structure Revision of Flavicansone

Solenn Ferron
Friardi Ismed
Mikhail E. Elyashberg
Alexei V. Buevich
Nurwahidatul Arifa
Joël Boustie
Philippe Uriac
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Résumé

Biodiscovery efforts in Indonesia have aimed to explore the understudied chemical diversity of its rich lichen flora, seeking to find new products endowed with significant biological properties. The chemical screening of a extract led to selection of this species for further investigation. LC/MS and H NMR-based dereplication pinpointed six chlorodepsidones from the thallus of a sample of this lichen. This led to the streamlined isolation and the subsequent structure elucidation of the three new compounds norflavicansone , flavicansone , and isocaloploicin , along with the known chlorodepsidones -, stictic acid , aurantiamide acetate , and parietin . The challenging structure elucidation of these proton-deficient metabolites benefited from a state-of-the-art workflow involving a synergistic combination of Computer-Assisted Structure Elucidation (CASE) and Density Functional Theory (DFT) calculations of the top-ranked candidates. This investigation also led to the revision of flavicansone's structure, previously described from this species. The three new molecules that are being reported here are remarkable in that they represent hybrid depsidones in which one of the aromatic rings is derived from orsellinic acid and the other is derived from β-orcinol, a rare structural feature for lichen depsidones.
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Dates et versions

hal-04614273 , version 1 (17-06-2024)

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Solenn Ferron, Friardi Ismed, Mikhail E. Elyashberg, Alexei V. Buevich, Nurwahidatul Arifa, et al.. CASE-DFT Structure Elucidation of Proton-Deficient Chlorodepsidones from the Indonesian Lichen Teloschistes flavicans and Structure Revision of Flavicansone. Journal of Natural Products, 2024, 87 (9), pp.2148-2159. ⟨10.1021/acs.jnatprod.4c00277⟩. ⟨hal-04614273⟩
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