A NEW QUASSINOID ISOLATED FROM PICROLEMMA-PSEUDOCOFFEA

Authors
ZUKERMANSCHPECTOR J CASTELLANO EE FHO ER CURSINO IJ
Citation
J. Zukermanschpector et al., A NEW QUASSINOID ISOLATED FROM PICROLEMMA-PSEUDOCOFFEA, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 794-797
Citations number
8
Categorie Soggetti
Crystallography
Journal title
Acta crystallographica. Section C, Crystal structure communications → ACNP
ISSN journal
01082701
Volume
50
Year of publication
1994
Part
5
Pages
794 - 797
Database
ISI
SICI code
0108-2701(1994)50:<794:ANQIFP>2.0.ZU;2-S
Abstract
The rings in -16,2'-dioxo-2,2'-olide-picras-1(1'),2-dien-21-oic acid m ethyl ester, C25H28O11.H2O (systematic name: methyl 4beta-acetyloxy-14 beta, 15alpha-dihydroxy-8alpha, 3a,4,5,6a,7,7a,8,12b,-13-decahydro-3,1 3-ethano-1H, ]furo-[3',2':5,6]naphtho[2,3-b]pyran-3-carboxylate monohy drate) have all-trans ring fusion. The carbomethoxy and the acetyloxy moieties are each in a pseudo-equatorial position and the hydroxyl gro ups are trans to each other. In the picrasane skeleton the methyl grou p at C(4) is in an alpha-configuration and the gamma-lactone ring is c is with respect to the methyl group at C(10).