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.
在澳大利亚大澳大利亚湾的拖网作业中采集到的一种 Sigmosceptrella sp.
在澳大利亚大澳大利亚湾的拖网作业中采集到的一种 Sigosceptrella sp.
一系列新的北萜烯。其中包括一种新的双萜烯、
sigmosceptrin-A(5);两种新的北萜烯,sigmosceptrin-B(14)和
(14) 和 sigmosceptrin-C (15);它们分别以其甲酯 (6) 和 (7) 的形式分离出来。
和乙酯(8)。
通过光谱分析、化学降解、衍生化等方法,这些西格蒙苷被赋予了完整的立体结构。
通过光谱分析、化学降解、衍生化以及单晶 X 射线
结构分析。提出了一种生物合成途径,它需要一种共同的
的生物合成前体。
过氧化物。