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Novel Prenylated Xanthones from Garcinia gerrardii H ARVEY
Author(s) -
SordatDiserens Isabelle,
Marston Andrew,
Hamburger Matthias,
Hostettmann Kurt,
Rogers Colin
Publication year - 1989
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19890720518
Subject(s) - xanthone , chemistry , garcinia , clusiaceae , bark (sound) , stereochemistry , prenylation , nuclear magnetic resonance spectroscopy , botany , organic chemistry , biology , enzyme , physics , acoustics
Three novel prenylated xanthones, 1–3 , have been isolated from the root bark of Garcinia gerrardii H ARVEY ex T. R. S IM ( G. natalensis S CHLECHTER ; G. transvaalensis B URTT D AVY ; Guttiferae). Structure elucidation was achieved by a combination of one‐ and two‐dimensional NMR spectroscopic techniques, including long‐range HETCOR, mass spectroscopy, and chemical methods. Garcigerrin A ( 1 ) and B ( 2 ) are pyrano derivatives of 3 . They all show a rare 1,4,5 oxygenation pattern of the xanthone nucleus. Xanthone 3 is fungicidal against Cladosporium cucumerinum .