essential for the antidiabeticactivity of flavonoids, we synthesized two series of flavonoids, 5,7‐dihydroxyflavanones and 5,7‐dihydroxyflavones. In a screening for potential antidiabeticactivity, most of the flavonoids showed a remarkable in vitro activity, and compounds 1f, 2d, and 3c were significantly more effective than the positive control, metformin. The biological activity was mainly affected
Treatment of B-ring substituted 5,7-dihydroxy flavones with alkyl halides in the presence of potassium carbonate gave unexpected 3-alkylated flavonoids. Related experiments were carried out to explain the formation of 3-alkylated flavonoids and a ring opening followed by alkylation and ring closure mechanism was proposed. (c) 2005 Elsevier Ltd. All rights reserved.
DERIVES DE 7-CARBOXY-FLAVONES, PROCEDE DE PREPARATION ET APPLICATION EN THERAPEUTIQUE