Vielopsides A-E, five new guaiane-type sesquiterpenoid dimers from Xylopia vielana

Xie, Yunying; Wu, Gaolin; Cheng, Tao; Zhu, Shuchai; Yan, Shaomin; Jin, Hui‐Zi; Zhang, Guoqing

doi:10.1016/j.fitote.2018.07.020

Cited by 13 publications

(1 citation statement)

References 11 publications

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“…According to our computations this is definitely the case; i.e., the revised structure, shown in Figure , contains the hydroxy 1,2-dioxolane moiety. While this exact revised structure is not known, somewhat similar dimeric peroxyhemiacetals, xylopidimers C and E, and vielopsides A–C were recently isolated from a related species Xylopia vielana. To better understand the energetics of the open and closed forms in these species, we subjected the truncated β-lactol and its peroxy counterpart to DFT calculations at the B3LYP/6-311+G(d,p) level, shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Natural Products Containing the Oxetane and Related Moieties Present Additional Challenges for Structure Elucidation: A DU8+ Computational Case Study

2019

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Analysis of published NMR data for natural products containing the oxetane moiety, with the help of a recently developed parametric/DFT hybrid computational method DU8+, has revealed that oxetanes and related compounds constitute yet another significant challenge in structure elucidation and stereochemistry assignment, as more than 30 structures required revision. The most common pitfalls are discussed, and revised structures are suggested for 26 natural products.

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Section: Resultsmentioning

confidence: 99%