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Drimane-type sesquiterpenes from Polygonum hydropiper.

Rajia Sultana1, Rashadul Hossain, Achyut Adhikari

  • 1Department of Chemistry, Chittagong University of Engineering and Technology, Chittagong, Bangladesh.

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Researchers isolated two new compounds, 3 β-angeloyloxy-7-epifutronolide and polygonumate, from Polygonum hydropiper Linn. The study details their structures and evaluates compound 6 for enzyme inhibition potential.

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Area of Science:

  • Natural Product Chemistry
  • Organic Chemistry
  • Pharmacology

Background:

  • Polygonum hydropiper Linn. is a plant known for its diverse chemical constituents.
  • Sesquiterpenoids are a class of natural products with various biological activities.
  • Drimane-type sesquiterpenoids represent a significant group within this class.

Purpose of the Study:

  • To isolate and characterize new and known compounds from Polygonum hydropiper Linn.
  • To elucidate the structures of isolated compounds using spectroscopic methods.
  • To evaluate the inhibitory potential of a specific compound against key enzymes.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation via spectroscopic methods including NMR and X-ray diffraction.
  • Enzyme inhibition assays for α-chymotrypsin, acetylcholinesterase, and butyrylcholinesterase.

Main Results:

  • Identification of two new compounds: 3 β-angeloyloxy-7-epifutronolide and polygonumate.
  • Isolation of six known drimane-type sesquiterpenes: dendocarbin L, (+) winterin, (+) fuegin, changweikangic acid A, futronolide, and 7-ketoisodrimenin.
  • First-time reporting of single-crystal X-ray diffraction for dendocarbin L and ¹³C-NMR data for (+) winterin.
  • Evaluation of changweikangic acid A for enzyme inhibition.

Conclusions:

  • The chemical investigation of Polygonum hydropiper Linn. yielded novel drimane-type sesquiterpenoids.
  • Advanced spectroscopic techniques and X-ray crystallography were crucial for structural determination.
  • Compound 6 demonstrated inhibitory activity against α-chymotrypsin, acetylcholinesterase, and butyrylcholinesterase, suggesting potential therapeutic applications.