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Five New Quassinoids from the Bark of Picrasma quassioides

✍ Scribed by Sheng-Ping Yang; Jian-Min Yue

Publisher
John Wiley and Sons
Year
2004
Tongue
German
Weight
190 KB
Volume
87
Category
Article
ISSN
0018-019X

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✦ Synopsis

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. Don) Benn. 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).

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