Yuccalechins A-C from the Roezl ex Ortgies Bark: Elucidation of the Relative and Absolute Configurations of Three New Spirobiflavonoids and Their Cholinesterase Inhibitory Activities.

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ID: 67499
2019
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Abstract
The ethyl acetate fraction of the methanolic extract of Roezl ex Ortgies bark exhibited moderate acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitory activity (IC 47.44 and 47.40 µg mL, respectively). Gel filtration on Sephadex LH-20 and further RP-C preparative HPLC of EtOAc fraction afforded 15 known and 3 new compounds, stereoisomers of larixinol. The structures of the isolated spirobiflavonoids , , and were elucidated using 1D and 2D NMR and MS spectroscopic techniques. The relative configuration of isolated compounds was assigned based on coupling constants and ROESY (rotating-frame Overhauser spectroscopy) correlations along with applying the DP4+ probability method in case of ambiguous chiral centers. Determination of absolute configuration was performed by comparing calculated electronic circular dichroism (ECD) spectra with experimental ones. Compounds and , obtained in sufficient amounts, were evaluated for activities against AChE and BChE, and they showed a weak inhibition only towards AChE (IC 294.18 µM for , and 655.18 µM for ). Furthermore, molecular docking simulations were performed to investigate the possible binding modes of and with AChE.
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pecio2019yuccalechinsmolecules Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Pecio, Łukasz;Alilou, Mostafa;Orhan, Ilkay Erdogan;Eren, Gokcen;Deniz, Fatma Sezer Senol;Stuppner, Hermann;Oleszek, Wiesław;
Journal molecules
Year 2019
DOI
E4162
URL
Keywords
alzheimer′s disease asparagaceae dp4+ ecd yucca schidigera absolute configuration spirobiflavonoid

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