XESTOBERGSTEROL-C, A NEW PENTACYCLIC STEROID FROM THE OKINAWAN MARINE SPONGE IRCINIA SP AND ABSOLUTE STEREOCHEMISTRY OF XESTOBERGSTEROL-A

被引：35

作者：

KOBAYASHI, J ^{[1
]}

SHINONAGA, H ^{[1
]}

SHIGEMORI, H ^{[1
]}

UMEYAMA, A ^{[1
]}

SHOJI, N ^{[1
]}

ARIHARA, S ^{[1
]}

机构：

[1] TOKUSHIMA BUNRI UNIV,FAC PHARMACEUT SCI,YAMASHIRO 770,TOKUSHIMA,JAPAN

来源：

JOURNAL OF NATURAL PRODUCTS-LLOYDIA | 1995年 / 58卷 / 02期

关键词：

D O I：

10.1021/np50116a029

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A new pentacyclic steroid, xestobergsterol C [1], possessing a cis C/D ring junction, has been isolated together with two known compounds, xestobergsterols A [2] and B [3], from the Okinawan marine sponge Ircinia sp., and the structure determined on the basis of spectral data. Reexamination of the nmr data of xestobergsterols A [2] and B [3] resulted in revision of the configuration at C-23 and of the conformation of ring D in 2 and 3. The absolute stereochemistry of xestobergsterol A [2] was established by the cd exciton chirality method.

引用

页码：312 / 318

页数：7

共 5 条

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