Structures of Euglobals-G1, -G2, -G3, -G4, and -G5 from Eucalyptus gradis

Midori TAKASAKI; Takao KONOSHIMA; Mutsuo KOZUKA; Mitsumasa HARUNA; Kazuo ITO; Tetsuro SHINGU

doi:10.1248/cpb.42.2591

Midori TAKASAKI, Takao KONOSHIMA, Mutsuo KOZUKA, Mitsumasa HARUNA, Kazuo ITO, Tetsuro SHINGU

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Keywords: Eucalyptus grandis, Myrtaceae, euglobal, phloroglucinol-monoterpene, two-dimensional-NMR

JOURNAL FREE ACCESS

1994 Volume 42 Issue 12 Pages 2591-2597

DOI https://doi.org/10.1248/cpb.42.2591

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Abstract

Five new euglobals with acylphloroglucinol-monoterpene structures (C₂₃H₃₀O₅), named euglobals-G1 (1), -G2 (2), -G3 (3), -G4 (4), and -G5 (5) were isolated from the chloroform extract of the juvenile leaves of Eucalyptus grandis W. HILL (Myrtaceae). The structures and relative stereochemistries of 1-5 have been elucidated on the basis of their two-dimensional (2D)-NMR spectra and difference in nuclear Overhauser effects (NOE) experiments.

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