The tetra-O-methyl ether of quercetin (QU) 3 (54%), 3,7,4′-tri-O-methyl ether 4 (30%), and a previously unreported 3,7,3-tri-O-methyl ether of QU 5 (7%) were obtained via methylation of QU by an excess of diazomethane in dioxane. Their structures were established using 2D NMR (1H–1H COSY, 1H–1H NOESY, 1H–13C HSQC, 1H–13C HMBC). Tetra-O-methyl ether of QU 3 exhibited pronounced hypoglycemic activity, reduced alloxan-induced hyperglycemia in rats by 44.5% compared to a control, and was 2.7 times more active than QU.
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Translated from Khimiya Prirodnykh Soedinenii, No. 5, September–October, 2020, pp. 718–721.
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Karimova, E.R., Baltina, L.A., Spirikhin, L.V. et al. Methylation of Quercetin by Diazomethane and Hypoglycemic Activity of its Tetra-O-Methyl Ether. Chem Nat Compd 56, 837–841 (2020). https://doi.org/10.1007/s10600-020-03164-2
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DOI: https://doi.org/10.1007/s10600-020-03164-2