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New 2'-oxygenated flavonoids from Andrographis affinis.
M Vijaya Bhaskar Reddy1, P Hari Kishore, C Venkata Rao
1Natural Products Division, Department of Chemistry, Sri Venkateswara University, Tirupati 517 502, India.
Journal of Natural Products
|March 1, 2003
Summary
Researchers isolated three new 2'-oxygenated flavonoids and two diterpenoids from the Andrographis affinis plant. These compounds, along with known flavonoids, were identified using spectral and chemical analyses for potential medicinal applications.
Area of Science:
- Phytochemistry
- Natural Product Chemistry
- Medicinal Plant Research
Background:
- Andrographis affinis is a plant species with a history of traditional medicinal use.
- Flavonoids and diterpenoids are classes of natural compounds known for diverse biological activities.
Purpose of the Study:
- To isolate and characterize chemical constituents from the whole plant of Andrographis affinis.
- To identify novel compounds and known phytochemicals for further investigation.
Main Methods:
- Phytochemical investigation involving extraction and isolation techniques.
- Structure elucidation using comprehensive spectral studies (e.g., NMR, MS) and chemical methods.
Main Results:
- Isolation of three new 2 '-oxygenated flavonoids: (2S)-5,7,2 ',3 ',4 '-pentamethoxyflavanone (1), 5-hydroxy-7,8,2 ',5 '-tetramethoxyflavone (2), and echioidinin 2 '-O-beta-d-(6 ' '-O-acetyl) glucopyranoside (3).
- Identification of four known flavonoids: 7-O-methyldihydrowogonin, 7-O-methylwogonin, skullcapflavone I 2 '-methyl ether, and skullcapflavone I.
- Isolation of two known diterpenoids: andrograpanin and 14-deoxy-11,12-didehydroandrographolide.
Conclusions:
- The phytochemical analysis of Andrographis affinis yielded a diverse array of flavonoids and diterpenoids.
- The identified compounds, including novel structures, contribute to the chemotaxonomic understanding of the Andrographis genus.
- Further studies are warranted to explore the pharmacological potential of these isolated natural products.