Fourteen terpenoids, including six new compounds, have been isolated from the marinespongeAcanthellacavernosa collected off Hachijo-jima Island. They inhibit of larval attachment and metamorphosis of the barnacle Balanus amphitrite. Their structures were determined mainly by spectroscopic methods.
Biotransformation of sesquiterpenoids, (−)-globulol and (+)-ledol by Glomerella cingulata
作者:Mitsuo Miyazawa、Tomoaki Uemura、Hiromu Kameoka
DOI:10.1016/s0031-9422(00)89522-9
日期:1994.11
Abstract The biotransformation of (−)-globulol and (+)-ledol by Glomerellacingulata was investigated. (−)-Globulol gave only one product which was hydroxylated at C-13. By contrast, (+)-ledol gave a number of products. The major metabolite contained a carboxylic group C-11 which was formed by Me-13. The structure of the new compound has been elucidated on the basis of its spectral data coupled with
Bridged to Fused Ring Interchange. Methodology for the Construction of Fused Cycloheptanes and Cyclooctanes. Total Syntheses of Ledol, Ledene, and Compressanolide
作者:S. L. Gwaltney、S. T. Sakata、K. J. Shea
DOI:10.1021/jo961005a
日期:1996.1.1
type two intramolecular Diels-Alder reaction (T2IMDA) is an efficient method for the formation of medium rings. The methodology is particularly effective for the construction of seven- and eight-memberedrings. A strategy for the synthesis of functionalized cycloheptanes and cyclooctanes has been developed that involves a bridged to fused ring interchange. The T2IMDA provides a synthesis for rigid
Compounds from
14
Kenyan plants, including from the root of
Dovyalis abyssinica
and
Clutia robusta
have been characterized and isolated, and their uses are disclosed.