[Sesquiterpenoids from gorgonian Muriceides collaris]

Area of Science:

• Marine Natural Products Chemistry
• Organic Chemistry
• Marine Biology

Background:

• Gorgonians are a rich source of structurally diverse secondary metabolites.
• Sesquiterpenoids, particularly guaiane-type compounds, exhibit a wide range of biological activities.
• The South China Sea is a biodiverse region with potential for novel chemical discoveries.

Purpose of the Study:

• To isolate and characterize sesquiterpenoids from the gorgonian Muriceides collaris.
• To identify new natural products and expand the known chemical diversity of marine organisms.
• To contribute to the chemotaxonomic understanding of gorgonian species.

Main Methods:

• Extraction and isolation of compounds using chromatographic techniques.
• Structure elucidation using comprehensive spectroscopic methods, including Mass Spectrometry (MS), Infrared (IR), Nuclear Magnetic Resonance (NMR - 1H, 13C, DEPT, HMQC, HMBC, NOESY).
• Comparison of spectral data with existing literature for known compounds.

Main Results:

• Isolation of seven guaiane-type sesquiterpenoids.
• Identification of two new compounds: 6-formyl-5-isopropyl-3-hydroxymethyl-7-methyl-1H-indene (1) and 5-isopropyl-3, 7-dimethyl-1H-indene-1-one (2).
• Characterization of five known compounds: guaiazulene (3), 4-formyl-7-isopropyl-10-methylazulene (4), sesquiterpene ketolactone (5), alismoxide (6), and guaia-1(5),6-diene (7).

Conclusions:

• The study successfully identified novel and known guaiane-type sesquiterpenoids from Muriceides collaris.
• The findings enhance the understanding of sesquiterpenoid diversity in marine invertebrates.
• This research provides valuable data for future investigations into the biological activities and applications of these compounds.