Complete 1H and 13C NMR structural assignments for five semi-synthetic eremantholides

[Display omitted] •Complete NMR assignment of semi-synthetic eremantholides.•Total clarification of hydrogen NMR signals: multiplicity and J values.•Original data to the literature. Five eremantholides were prepared from natural furanoheliangolides by reductions with Stryker's reagent, in previ...

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Bibliographic Details
Published in:Journal of molecular structure 2021-11, Vol.1244, p.131004, Article 131004
Main Authors: Sass, Daiane C., Ferreira, Alexsandro E., Vieira, Gabrielle, Rezende, Ana Laura M., Kovatch, Pedro Y., Palaretti, Vinícius, Constantino, Mauricio G., Heleno, Vladimir C.G.
Format: Article
Language:English
Subjects:
Eremantholides
Multiplicities clarifying
NMR data
Sesquiterpene lactones
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Summary:[Display omitted] •Complete NMR assignment of semi-synthetic eremantholides.•Total clarification of hydrogen NMR signals: multiplicity and J values.•Original data to the literature. Five eremantholides were prepared from natural furanoheliangolides by reductions with Stryker's reagent, in previous works. We thus decided to perform a detailed and complete assignment of all 1H and 13C NMR data for those compounds. Through NMR experiments such as 1H NMR, 13C {1H} NMR, gCOSY, gHMQC, gHMBC, J-resolved, among others, it was achieved an unequivocal assignment of 1H and 13C NMR data for all studied substances, with measurement of all H/H homonuclear coupling constants and the clarification of all hydrogen signals multiplicities. Those data were not completely available yet in the literature.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2021.131004