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Two new chalcones from Clerodendrum phlomidis.

Aluru Rammohan1, Rachakunta Munikishore, Duvvuru Gunasekar

  • 1a Natural Products Division, Department of Chemistry, Sri Venkateswara University , Tirupati 517502 , India.

Journal of Asian Natural Products Research
|October 16, 2014
PubMed
Summary

Researchers isolated two novel chalcones and three known flavonoids from Clerodendrum phlomidis seeds. Their structures were confirmed using advanced nuclear magnetic resonance (NMR) spectroscopy techniques.

Keywords:
Clerodendrum phlomidisVerbenaceaechalconesseeds

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Clerodendrum phlomidis is a plant species known for its traditional medicinal uses.
  • The isolation and characterization of bioactive compounds from plant sources are crucial for drug discovery.
  • Chalcones and flavonoids are classes of natural products with diverse biological activities.

Purpose of the Study:

  • To isolate and identify new chemical constituents from the seeds of Clerodendrum phlomidis.
  • To elucidate the structures of the newly discovered compounds.
  • To contribute to the phytochemical knowledge of the Clerodendrum genus.

Main Methods:

  • Extraction of compounds from Clerodendrum phlomidis seeds.
  • Purification of isolated compounds using chromatographic techniques.
  • Structure elucidation of new compounds using 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • Two new chalcones, 3,2',3'-trihydroxy-4'-methoxychalcone (1) and 3,2'-dihydroxy-4',6'-dimethoxychalcone (2), were successfully isolated.
  • Three known flavonoids, 5-hydroxy-7-methoxyflavanone (3), 5-hydroxy-7-methoxyflavone (4), and kaempferol-3-O-α-l-rhamnopyranoside (5), were also identified.
  • The structures of the novel chalcones were confirmed through comprehensive spectroscopic analysis, primarily 1D and 2D NMR data.

Conclusions:

  • The phytochemical investigation of Clerodendrum phlomidis seeds yielded two new chalcones and three known flavonoids.
  • The structural characterization was primarily achieved using advanced NMR techniques, confirming the novelty of compounds 1 and 2.
  • This study expands the understanding of the chemical diversity within Clerodendrum phlomidis and provides potential leads for further pharmacological research.