Five New Quassinoids from the Bark of <i>Picrasma quassioides</i>
Helvetica Chimica ActaPublished 1 June 2004Open access
Sheng‐Ping Yang, Jian‐Min Yue
Citations66
SJR quartileQ2
SJR score0.49
SNIP0.45
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TL;DR
Five new quassinoids, named picraqualides A–E (1–5), together with eleven known ones, were isolated from the EtOH extract of the bark of Picrasma quassioides (D. Don) Benn.
Abstract
Abstract Five new quassinoids, named picraqualides A–E ( 1 – 5 ), together with eleven known ones, nigakilactone E ( 6 ), nigakilactone F ( 7 ), kusulactone ( 8 ), javanicin U ( 9 ), 12‐norquassin ( 10 ), quassin ( 11 ), 2,3‐didehydropicrasin B ( 12 ), nigakilactone B ( 13 ), nigakilactone C ( 14 ), picrasin B ( 15 ), and simalikalacton C ( 16 ), were isolated from the EtOH extract of the bark of Picrasma quassioides (D. D on ) B enn . Their structures were determined mainly by spectroscopic methods, especially by 2D‐NMR techniques and circular dichroism (CD). Some empirical rules were summarized on the basis of 13 C‐NMR spectral analysis to distinguish between OH (or Ac) groups attached at C(11) vs. C(13).
Keywords
Biochemistry, Genetics and Molecular Biology
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