An improved synthesis of (+)-agelasine D (10) from (+)-manool is reported together with cytotoxic and antibacterial data for agelasine D and structurally close synthetic analogues. These compounds display a broad spectrum of antibacterial activities including effects on M. tuberculosis and Gram-positive and Gram-negative bacteria (both aerobes and anaerobes). They exhibit profound cytotoxic activity
Agelasine-A, -B, -C and -D, novel bicyclic diterpenoids with a 9-methyladeninium unit possessing inhibitory effects on na,K-atpase from the okinawa sea sponge sp.1)
Agelasine-A, -B, -C and -D, novel bicyclic diterpenoids having inhibitoryeffects on enzymic reactions of Na,K-ATPase, have been isolatedfrom the orange colored Okinawanseasponge Agelas sp. and the structures have been determined on the basis of their spectral data and chemical conversions.
well as N6-hydroxyagelasine analogs were synthesized by selective N-7 alkylation of N6-[tert-butyl(dimethyl)silyloxy]-9-methyl-9H-purin-6-amine in order to install the terpenoid side chain, followed by fluoride mediated removal of the TBDMS-protecting group. N6-Hydroxyagelasine D and the analog carrying a geranylgeranyl side chain displayed profound antimicrobialactivities against several pathogenic
Novel diterpenes, agelasine-A, -B, -C, -D, -E, and -F were isolatedfrom the Okinawan marine sponge Agelas nakamurai Hoshino and their structures were established to be monocyclic and bicyclic diterpenes having a 9-methyladeniniumunit by spectral analyses and chemical transformations.
(+)-Agelasine D, originally isolated from the marine sponge Agelas nakamurai, is synthesized for the first time. The terpenoid side chain was readily available from the diterpene alcohol (+)-manool. (C) 2004 Elsevier Ltd. All rights reserved.