
TY  - JOUR
A1  - Bassett,, Sean 
A1  - Ovenden, Simon P. B. 
A1  - Gable, Robert W. 
A1  - Capon, Robert J. 
T1  - Sigmosceptrins A&#8211;C: New Norditerpenes from a Southern Australian Marine Sponge, <b><emph type="2">Sigmosceptrella</emph></b> sp.
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1998
VL  - 50
IS  - 12
SP  - 1137
EP  - 1144
KW  - 
UR  - https://doi.org/10.1071/C97090 
N2  - 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. 
ER  -

