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- W4387662100 abstract "Four previous papers reported the isolation and structural determination of 10 polycyclic polyprenylated acylphloroglucinols (PPAPs), uraliones F, G, K, and O, attenuatumiones E and F, and scabrumiones A-D, from Hypericum species. Their structures were identified as type B PPAPs that featured not only the characteristic acyl group at C-3 of the bicyclo[3.3.1]nonane core but also a partly reduced furan ring fused to the C-1-C-2-O-2 atoms of the core. However, the 1D and 2D NMR data of these compounds were more consistent with type A PPAPs that featured not only the acyl group at C-1 but also a partially reduced furan ring fused to the C-3-C-2-O-2 atoms of the core. Now we revise these 10 previously proposed structures to the corresponding type A PPAPs via NMR analysis. Additionally, we propose a rule that uses NMR data to determine whether a particular PPAP that is fused to a partly reduced furan ring at C-3-C-2-O-2 or C-1-C-2-O-2 is type A or type B, respectively. We also propose a rule to assign the relative configurations of corresponding type A PPAPs at C-18 and revise the configurations of sampsonione N, hypericumoxides A-C, and hyperscabin G." @default.
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- W4387662100 date "2023-10-16" @default.
- W4387662100 modified "2023-10-17" @default.
- W4387662100 title "Structure Revision of Type B Polycyclic Polyprenylated Acylphloroglucinols Fused to a Partly Reduced Furan Ring" @default.
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- W4387662100 doi "https://doi.org/10.1021/acs.jnatprod.3c00591" @default.
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