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Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
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Anthocyanone A: a quinone methide derivative resulting from malvidin 3-O-glucoside degradation

Paulo Lopes1, Tristan Richard, Cédric Saucier

  • 1Faculté d'Oenologie de Bordeaux, Université Victor Segalen Bordeaux 2, UMR 1219 INRA, 351 Cours de la Libération, 33405 Talence Cedex, France.

Journal of Agricultural and Food Chemistry
|March 7, 2007
PubMed

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.