
%0 Journal Article
%A Bassett,, Sean 
%A Ovenden, Simon P. B. 
%A Gable, Robert W. 
%A Capon, Robert J. 
%T Sigmosceptrins A&#8211;C: New Norditerpenes from a Southern Australian Marine Sponge, <b><emph type="2">Sigmosceptrella</emph></b> sp.
%J Australian Journal of Chemistry
%D 1998/02/05
%V 50
%N 12
%P 1137-1144
%K 
%R https://doi.org/10.1071/C97090
%U https://www.publish.csiro.au/paper/C97090 
%X A Sigmosceptrella sp. of sponge collected during trawling operations in the Great Australian Bight, Australia, has yielded a series of new norterpenes. These include a new bisnorditerpene, sigmosceptrin-A (5); two new norditerpenes, sigmosceptrin-B (14) and sigmosceptrin-C (15), isolated as their methyl esters (6) and (7) respectively; and an ethylated artefact, sigmosceptrin-B ethyl ester (8). Complete stereostructures were assigned to the sigmosceptrins by spectroscopic analysis, chemical degradation, derivatization, and by a single-crystal X-ray structural analysis. A biosynthetic pathway is proposed that requires a common biosynthetic precursor to both the sigmosceptrins and norterpene cyclic peroxides. 
