Clerodane diterpenoids from Croton crassifolius

Area of Science:

• Natural Products Chemistry
• Organic Chemistry
• Pharmacology

Background:

• Croton crassifolius species are known sources of bioactive compounds.
• Diterpenoids represent a diverse class of natural products with various biological activities.

Purpose of the Study:

• To isolate and characterize new clerodane diterpenoids from Croton crassifolius roots.
• To evaluate the in vitro antiviral activity of isolated compounds against herpes simplex virus type 1.

Main Methods:

• Isolation of compounds using chromatographic techniques.
• Structure elucidation through extensive spectroscopic methods (IR, UV, HRESIMS, 1D and 2D NMR).
• Confirmation of specific structures via single-crystal X-ray diffraction analysis.
• Antiviral activity assessment using the cytopathic effect reduction assay.

Main Results:

• Seven new clerodane diterpenoids (1-7) were successfully isolated and identified.
• Six known compounds were also isolated from the same plant source.
• Structures of compounds 1, 3, 4, and 7 were unequivocally confirmed by X-ray crystallography.
• Compounds 1-13 were screened for antiviral activity against herpes simplex virus type 1.

Conclusions:

• The study successfully identified novel clerodane diterpenoids from Croton crassifolius.
• The isolated compounds represent potential leads for the development of new antiviral agents against herpes simplex virus type 1.