Guaiane-type sesquiterpenoids from Alisma orientalis.

Area of Science:

• Natural Product Chemistry
• Organic Chemistry
• Pharmacognosy

Background:

• Alisma orientalis (SAM) JUZEP is a plant used in traditional medicine.
• Sesquiterpenoids are a class of natural products with diverse biological activities.
• Guaiane-type sesquiterpenoids are a specific subclass found in various plants.

Purpose of the Study:

• To isolate and characterize novel guaiane-type sesquiterpenoids from Alisma orientalis.
• To elucidate the stereostructures of the isolated compounds.
• To contribute to the understanding of the chemical constituents of Alisma orientalis.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation of novel compounds using spectroscopic methods (NMR, MS).
• Determination of absolute stereostructures via chemical correlation with known compounds.

Main Results:

• Two new guaiane-type sesquiterpenoids, orientalol E (1) and orientalol F (3), were identified.
• Two known guaiane-type sesquiterpenoids, alismol (2) and alismoxide (4), were also isolated.
• Relative stereostructures were determined by spectroscopic analysis.
• Absolute stereostructures were confirmed through chemical correlation.

Conclusions:

• The study successfully identified and characterized two new sesquiterpenoids from Alisma orientalis.
• The findings expand the knowledge of guaiane-type sesquiterpenoids and their natural sources.
• This research provides a basis for further investigation into the potential bioactivities of these compounds.