Nortriterpenoids and lignans from Schisandra sphenanthera

Area of Science:

• Phytochemistry
• Natural Products Chemistry
• Medicinal Chemistry

Background:

• Schisandra sphenanthera is a traditional medicinal plant with a rich history of use.
• The chemical constituents of S. sphenanthera are known to possess diverse biological activities.
• Further investigation into its phytochemical profile may yield novel bioactive compounds.

Purpose of the Study:

• To isolate and characterize new chemical compounds from Schisandra sphenanthera.
• To evaluate the anti-HIV-1 activity of the isolated compounds.

Main Methods:

• Phytochemical investigation involving extraction and isolation techniques.
• Structure elucidation using comprehensive spectroscopic methods (1D and 2D NMR).
• Single-crystal X-ray diffraction for structural confirmation of compound 2.
• In vitro anti-HIV-1 assays to determine EC(50) values.

Main Results:

• Two new nortriterpenoids, sphenadilactone C (1) and sphenasin A (2), were identified.
• Four known lignans (3-6) were also isolated from the plant material.
• Compound 2's structure was unequivocally confirmed by X-ray crystallography.
• Compounds 1, 3-6 demonstrated weak anti-HIV-1 activity, with EC(50) values ranging from 15.5 to 29.5 μg/mL.

Conclusions:

• The study successfully identified novel nortriterpenoids and lignans from Schisandra sphenanthera.
• The isolated compounds, particularly sphenadilactone C and the lignans, show potential for further development as anti-HIV-1 agents.
• This research contributes to the understanding of S. sphenanthera's chemical diversity and medicinal potential.