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Tyrosinase catalysed biphenyl construction from flavan-3-ol substrates
W J van Rensburg1, D Ferreira, E Malan
1Department of Chemistry, University of the Orange Free State, Bloemfontein, South Africa. jvrensw@cem.nw.uovs.ac.za
Phytochemistry
|February 19, 2000
Summary
Researchers used mushroom tyrosinase to create new biphenyl-containing flavan-3-ol derivatives. This method also improved the synthesis of a known natural flavan-3-ol dimer.
Area of Science:
- Enzymology and Organic Chemistry
- Natural Product Synthesis
Background:
- Flavan-3-ols are important natural products with diverse biological activities.
- Constructing biphenyl linkages in flavan-3-ols is synthetically challenging.
- Tyrosinase enzymes offer potential for novel oxidative coupling reactions.
Purpose of the Study:
- To explore the use of mushroom tyrosinase for synthesizing biphenyl bonds in flavan-3-ols.
- To create and characterize novel flavan-3-ol derivatives.
- To improve the synthesis of the natural dimer mesquitol-[5-->8]-catechin.
Main Methods:
- Enzymatic oxidation of catechin, fisetinidol, and mesquitol using mushroom tyrosinase.
- Trapping of o-quinone intermediates to form biphenyl linkages.
- Structural elucidation of novel derivatives using mono- and two-dimensional 1H-NMR spectroscopy.
Main Results:
- Successful construction of biphenyl bonds in flavan-3-ols via tyrosinase catalysis.
- Formation of novel flavan-3-ol derivatives with elucidated structures.
- Enhanced synthesis of the natural dimer mesquitol-[5-->8]-catechin.
Conclusions:
- Mushroom tyrosinase is an effective biocatalyst for constructing flavan-3-ol biphenyl linkages.
- This enzymatic approach provides a novel route to synthesize complex flavan-3-ol derivatives.
- The methodology offers an improved pathway for producing naturally occurring flavan-3-ol dimers.