3306-29-4

Usage

InChI:InChI=1/C17H14O7/c1-22-11-4-3-8(5-12(11)23-2)17-16(21)15(20)14-10(19)6-9(18)7-13(14)24-17/h3-7,18-19,21H,1-2H3

Upstream product

• 1393953-75-7 2-(3,4-dimethoxyphenyl)-5-hydroxy-3,7-bis(methoxymethoxy)-4H-chromen-4-one 
• 117-39-5 quercetol 
• 485-80-3 S-adenosyl-L-methionine 

Relevant academic research and scientific papers

A new flavonol glycoside from the aerial part of Alhagi pseudalhagi

The new flavonol glycoside alhaoside was isolated from the aerial part of Alhagi pseudalhagi (Fabaceae). The structure 3,4-di-O-methylquercetin-3-O- α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranosyl-7-O-α- Lrhamnopyranosyl-(1→6)-β-D-galactopyranoside was established for alhaoside based on spectral characteristics and chemical transformations.

Influence of Substrate Binding Residues on the Substrate Scope and Regioselectivity of a Plant O-Methyltransferase against Flavonoids

Methylation of free hydroxyl groups is an important modification for flavonoids. It not only greatly increases absorption and oral bioavailability of flavonoids, but also brings new biological activities. Flavonoid methylation is usually achieved by a specific group of plant O-methyltransferases (OMTs) which typically exhibit high substrate specificity. Here we investigated the effect of several residues in the binding pocket of the Clarkia breweri isoeugenol OMT on the substrate scope and regioselectivity against flavonoids. The mutation T133M, identified as reported in our previous publication, increased the activity of the enzyme against several flavonoids, namely eriodictyol, naringenin, luteolin, quercetin and even the isoflavonoid genistein, while a reduced set of amino acids at positions 322 and 326 affected both, the activity and the regioselectivity of the methyltranferase. On the basis of this work, methylated flavonoids that are rare in nature were produced in high purity.

Biological evaluation and SAR analysis of O-methylated analogs of quercetin as inhibitors of cancer cell proliferation

Preclinical Research Using a high-throughout screening approach, the anticancer activities of 16 O-methylated (OMe) analogs of quercetin were assessed. The structure-activity relationships showed that OMe moieties at the 4′ and/or 7 positions were important for maintaining inhibitory activities against the 16 cancer cell lines. Furthermore, when the OH groups at the 3′ and 4′ positions were both replaced by OMe moieties, anticancer activity was enhanced.

Metabolism-based synthesis, biologic evaluation and SARs analysis of O-methylated analogs of quercetin as thrombin inhibitors

In blood, quercetin is mainly found in metabolized forms. In order to study the activities of these quercetin metabolites in cardiovascular disease, 17 methylquercetin derivatives were synthesized based on metabolism in vivo, their thrombin inhibition activity were evaluated through the analyzation of prothrombin time (PT), activated partial thromboplastin time (APTT), thrombin time (TT) and fibrinogen (FIB). The results showed that 6 methylquercetin derivatives had stronger inhibitory activities than that of quercetin. Preliminary SARs analysis showed that hydroxyl groups at C-3′ and C-4′ position in the B-ring and hydroxyl group at C-3 position in the C-ring played key roles in the thrombin inhibitory activity. The findings of this study would provide information for the exploitation and utilization of quercetin as thrombin inhibitor for thrombotic disease treatment.