Process for preparing flavonoid compound

C - Chemistry – Metallurgy – 07 – H

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C07H 17/07 (2006.01) C07H 17/08 (2006.01)

Patent

CA 2401713

A simple and easy process for preparing pharmacologically useful flavonoids exhibiting effects of inhibiting aldose reductase, extinguishing active oxygen, inhibiting carcinogenesis promotion, counteracting inflammation, and so on. Specifically, a process for preparing compounds of the general formula (I) by bonding a sugar derivative to a catechin compound as the starting material selectively via O-glycosidation and then oxidizing the resulting glycoside at the 4-position of flavonoid skeleton, wherein R2 is optionally substituted phenyl; R7 is hydrogen or hydroxyl; and n is an integer of 1 to 4.

On décrit un procédé de préparation à la fois simple et facile de flavonoïdes utiles du point de vue pharmacologique qui présentent des effets tels que l'inhibition de l'aldose réductase, la suppression de l'oxygène actif, l'inhibition de l'activation de la carcinogenèse, la neutralisation de l'inflammation et autres. De manière plus spécifique, un procédé de préparation de composés représentés par la formule (I) consiste à lier un dérivé de sucre à un composé de catéchine utilisé en tant que matière de départ sélectivement par une glycosidation O puis à oxyder le glycoside résultant au niveau de la position 4 du squelette de flavonoïde. Dans la formule (I), R?2¿ représente phényle facultativement substitué ; R?7¿ représente hydrogène ou hydroxyle ; et n représente un entier compris entre 1 et 4.

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