The Use of Two-Dimensional nmr and Relaxation Reagents to Determine Stereochemical Features in Acyclic Sesterterpenes

Heterocyclic Terpenes: Linear Furano‐ and Pyrroloterpenoids

“…collected from Fiji and also found from a Truck lagoon sponge. 156 Palominin 222 is another geometrical isomer obtained 157 from a Caribbean Ircinia species. Like many of these compounds from sponges, it possesses ichthyotoxic properties and thus may have a role in protecting the sponge against predators.…”

An Antibacterial 9,11-Secosterol from a Marine Sponge Ircinia sp.

“…The genus Ircinia has been known as a rich source of biologically active natural products including antibacterial compounds, 7,8 cytotoxin, 9 ichthyotoxin, 10 analgesic compound, 11,12 multidrug resistance modulator, 13 thrombin inhibitor, 14 angiotensin converting enzyme/aldose reductase inhibitor, 15 and inosine monophosphate dehydrogenase inhibitor.…”

Heterocyclic terpenes: linear furano- and pyrroloterpenoids

“…NMR studies of ircinins 1 237 and 2 238, two difuranosesterterpenes isolated from a Fijian Ircinia sp., have been reported. 156 Two additional oxygenated furanosesterterpenes, 245 and 246, have been described from an Ircinia species collected from Kaikoura, New Zealand. 174 Variabilin is readily available from Ircinia, Psammocinia, and Sarcotragus species, and because it shows promising activity as an antiviral agent, its chemistry has been explored.…”