Inubritantrimers A–D: Trimerized Sesquiterpenoid [4 + 2] Adducts Featuring a Distinctive Spiro-Polycyclic Scaffold from Inula britannica
Cong Guo,
Ruo-Yu Qi,
Jie-Yi Ren
et al.
Abstract:Inubritantrimer A (1), a trace trimerized
sesquiterpenoid
[4 + 2] adduct featuring an unusual exo-exo type spiro-polycyclic scaffold, together with three new endo-exo [4 + 2] adducts, inubritantrimers
B–D (2–4), were discovered
from the flowers of Inula britannica. Their structures
were elucidated using 1D/2D NMR, X-ray diffraction, and ECD approaches. 1 is characterized as a novel exo-exo trimer, synthesized biogenetically from three sesquiterpenoid
monomers, featuring a unique linkage of C-11/C-1′, C-13/C-3′… Show more
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