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Updated: Jun 23, 2026

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade

Published on: August 14, 2019

Flavonoids from Tephrosia calophylla.

Ramireddy V Narahari Reddy¹, Shaik I Khalivulla, Bandi A K Reddy

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

Natural Product Communications

|April 18, 2009

Summary

Researchers isolated two novel flavanones and three known compounds from Tephrosia calophylla roots. Structure elucidation of the new flavanones was achieved using advanced 2D Nuclear Magnetic Resonance (NMR) techniques.

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Area of Science:

Phytochemistry
Natural Products Chemistry
Organic Chemistry

Background:

Tephrosia calophylla is a plant species known for its potential medicinal properties.
The isolation and characterization of bioactive compounds from plant sources are crucial for drug discovery.
Flavanones represent a class of flavonoids with diverse biological activities.

Purpose of the Study:

To isolate and identify new and known chemical constituents from the roots of Tephrosia calophylla.
To elucidate the chemical structures of the isolated compounds, particularly the novel flavanones.
To contribute to the phytochemical knowledge of the Tephrosia genus.

Main Methods:

Plant material extraction and fractionation.
Chromatographic techniques (e.g., column chromatography) for compound isolation.
Extensive 2D Nuclear Magnetic Resonance (NMR) spectroscopy (e.g., COSY, HSQC, HMBC) for structure determination.

Main Results:

Isolation of two new flavanones: (2S)-5-hydroxy-7,4'-di-O-(gamma,gamma-dimethylallyl)flavanone (1) and 6-hydroxy-E-3-(2,5-dimethoxybenzylidine)-2',5'-dimethoxyflavanone (2).
Identification of three known compounds: tephrowatsin C, afrormosin, and kaempferol 3-O-beta-D-glucopyranoside.
Confirmation of the structures of compounds 1 and 2 through detailed analysis of 2D NMR spectral data.

Conclusions:

The roots of Tephrosia calophylla contain a rich profile of flavanones, including novel structures.
The identified compounds, particularly the new flavanones, may possess unique chemical properties and potential biological activities.
This study expands the understanding of the phytochemical diversity within the Tephrosia genus.