Sesquiterpenes from the sponge Axinyssa isabela.

Area of Science:

• Marine Natural Products Chemistry
• Organic Chemistry
• Chemical Biology

Background:

• Marine sponges are a rich source of structurally diverse secondary metabolites.
• The sponge Axinyssa isabela from the Gulf of California is known to produce unique chemical compounds.

Purpose of the Study:

• To isolate and characterize new sesquiterpenes from Axinyssa isabela.
• To investigate the cytotoxic potential of these isolated compounds against human tumor cell lines.

Main Methods:

• Spectroscopic techniques (NMR, MS) were employed for structure elucidation.
• Absolute configurations were determined using derivatization with MPA acids.
• Chemical synthesis was used to confirm the structure of a nitrile-containing sesquiterpene.

Main Results:

• Nine new sesquiterpenes were isolated: axinisothiocyanates M and N, axinythiocyanate A, axinysones A-E, and axinynitrile A.
• Four known sesquiterpenoids were also identified.
• The absolute configurations of axinysones A and B were established.
• Axinynitrile A was synthesized from (+)-aristolone.
• The isolated compounds were screened for cytotoxic activity against three human tumor cell lines.

Conclusions:

• The study expands the knowledge of sesquiterpene diversity in marine sponges.
• New compounds from Axinyssa isabela possess potential cytotoxic properties warranting further investigation.