31721-94-5Relevant articles and documents
INHIBITORS OF ANTIGEN PRESENTATION BY HLA-DR
-
Page/Page column 128, (2021/10/11)
Chromanone compounds, pharmaceutical compositions containing them, methods of making them, and methods of using them including methods for treating disease states, disorders, and conditions associated with the inhibition of antigen presentation by HLA-DR.
Natural and Synthetic Flavonoids as Potent Mycobacterium tuberculosis UGM Inhibitors
Villaume, Sydney A.,Fu, Jian,N'Go, Inès,Liang, Hui,Lou, Huayong,Kremer, Laurent,Pan, Weidong,Vincent, Stéphane P.
, p. 10423 - 10429 (2017/08/07)
This study reports a novel class of inhibitors of uridine 5′-diphosphate (UDP) galactopyranose mutase (UGM) derived from a screening of natural products. This enzyme is an essential biocatalyst involved in the cell wall biosynthesis of Mycobacterium tuberculosis. Flavonoids are potent inhibitors of UGM. The synthesis of novel methylated flavonoids allowed a structure–activity relationship analysis to be performed and which functional groups and structural elements were required for UGM inhibition could be determined. The binding mode of one of the best inhibitors was found to be noncompetitive. Docking simulations indicated that this molecule was likely to bind UGM in its open conformation, in a cavity recently identified as a “druggable” pocket. Importantly, two of the best inhibitors of the M. tuberculosis UGM displayed moderate activity against whole M. tuberculosis cells. This study reports the first natural products that act as inhibitor of UGM. Given the importance of natural products in medicinal chemistry, these results create new opportunities for the discovery of new antitubercular agents.
Difluoromethylthiolation of Phenols and Related Compounds with a HF2CSO2Na/Ph2PCl/Me3SiCl System
Huang, Zhongyan,Matsubara, Okiya,Jia, Shichong,Tokunaga, Etsuko,Shibata, Norio
supporting information, p. 934 - 937 (2017/02/26)
A novel HF2CSO2Na/Ph2PCl/Me3SiCl system is disclosed for the late-stage direct difluoromethylthiolation of Csp2 and Csp3 nucleophiles. Difluoromethylthiolation of phenols and naphthols proceeded nicely under this system to regioselectively provide corresponding SCF2H compounds in good yields. Other substrates such as indoles, pyrroles, pyrazoles, enamines, ketones, and β-keto esters were also transformed to corresponding SCF2H products in good yields. The late-stage direct difluoromethylthiolation of a number of natural products and pharmaceutically attractive molecules was also achieved.
Natural product Hirtellanine B and its derivatives in the preparation process for the preparation of medicine for treating tumor with the application of the
-
Paragraph 0116; 0117, (2016/10/10)
The present invention provides a preparation method of a natural product Hirtellanine B, wherein 2,4,6-trihydroxyacetophenone is adopted as a raw material, and steps of compound a preparation, compound b preparation, compound c preparation, compound d preparation, compound e preparation, compound f preparation, compound g preparation, and the like are performed to prepare the natural product Hirtellanine B. According to the present invention, biological activity screening is performed on Hirtellanine B and 14 Hirtellanine B derivatives, and results show that the natural product Hirtellanine B can inhibit proliferations of Jurkat cells, Raji cells and K562 cells, and the compounds provide a certain inhibition activity for tumor cells. The method has characteristics of easily available raw material, high reaction yield and reasonable operation, and is suitable for industrial production. The Hirtellanine B and the derivatives thereof can be used for preparing tumor treatment drugs, and have great clinical values. The natural product Hirtellanine B preparation method reaction formulas are as the follows.
Ru(II)-Catalyzed Site-Selective Hydroxylation of Flavone and Chromone Derivatives: The Importance of the 5-Hydroxyl Motif for the Inhibition of Aurora Kinases
Kim, Kiho,Choe, Hyeonjeong,Jeong, Yujeong,Lee, Jun Hee,Hong, Sungwoo
supporting information, p. 2550 - 2553 (2015/05/27)
An efficient protocol for Ru(II)-catalyzed direct C-H oxygenation of a broad range of flavone and chromone substrates was developed. This convenient and powerful synthetic tool allows for the rapid installation of the hydroxyl group into the flavone, chromone, and other related scaffolds and opens the way for analog synthesis of highly potent Aurora kinase inhibitors. The molecular docking simulations indicate that the formation of bidentate H-bonding patterns in the hinge regions between the 5-hydroxyflavonoids and Ala213 was the significant binding force, which is consistent with experimental and computational findings.
Multifunctional tacrine-flavonoid hybrids with cholinergic, β-amyloid-reducing, and metal chelating properties for the treatment of Alzheimer's disease
Li, Su-Yi,Wang, Xiao-Bing,Xie, Sai-Sai,Jiang, Neng,Wang, Kelvin D.G.,Yao, He-Quan,Sun, Hong-Bin,Kong, Ling-Yi
, p. 632 - 646 (2013/10/22)
A new series of tacrine-flavonoid hybrids (13a-u) had been designed, synthesized, and evaluated as multifunctional cholinesterase (ChE) inhibitors against Alzheimer's disease (AD). In vitro studies showed that most of the molecules exhibited a significant ability to inhibit ChE and self-induced amyloid-β (Aβ1-42) aggregation. Kinetic and molecular modeling studies also indicated compounds were mixed-type inhibitors, binding simultaneously to active, peripheral and mid-gorge sites of AChE. Particularly, compound 13k was found to be highly potent and showed a balanced inhibitory profile against ChE and self-induced Aβ1-42 aggregation. Moreover, it also showed excellent metal chelating property and low cell toxicity. These results suggested that 13k might be an excellent multifunctional agent for AD treatment.
Studies on the total synthesis of Hirtellanine A: Regioselective synthesis of benzopyran
Zheng, Shu-Yan,Li, Xiao-Ping,Tan, Hong-Sheng,Yu, Chun-Hui,Zhang, Jing-Hua,Shen, Zheng-Wu
, p. 1356 - 1366 (2013/04/10)
The total synthesis of Hirtellanine A was accomplished by two different synthetic approaches. Hirtellanine A was assembled using a one-pot, tandem acid-mediated deprotection and tautomerization cascade starting from quinone derivative 23. The key features
A mild and efficient protocol to synthesize chromones, isoflavones, and homoisoflavones using the complex 2,4,6-trichloro-1,3,5-triazine/ dimethylformamide
Basha, G. Mahaboob,Yadav, S. Kumar,Srinuvasarao,Prasanthi,Ramu,Mangarao,Siddaiah
, p. 763 - 768 (2013/08/23)
A mild and efficient one-flask method has been developed for the synthesis of chromones, isoflavones, and homoisoflavones from 2-hydroxyacetophenones, deoxybenzoins, and dihydrochalcones, respectively, via one-carbon extension using the complex 2,4,6-trichloro-1,3,5-triazine/dimethylformamide. Deoxybenzoins and dihydrochalcones were prepared in situ by the reaction of readily available substituted phenols with phenylacetic acids and 3-phenylpropanoic acids, respectively. This method allows the synthesis of a wide range of compounds with multiple phenolic hydroxyls and other substituents. The methodology has been applied to the synthesis of three naturally occurring isoflavones such as formononetin (9c), daidzein (9d), and retusin (9h).
Total synthesis of Hirtellanine A
Zheng, Shu-Yan,Shen, Zheng-Wu
supporting information; experimental part, p. 2883 - 2887 (2010/06/14)
The first total synthesis of hirtellanines A is described. The key transformations include (i) base-mediated regioselective pyran ring formation, (ii) one-pot sequential boronation and Suzuki-Miyaura cross-coupling, and (iii) a tandem acid-induced deprotection and subsequent tautomerizations.
Isoflavone glycosides: Synthesis and evaluation as α-glucosidase inhibitors
Wei, Guo,Yu, Biao
experimental part, p. 3156 - 3163 (2009/06/06)
On the basis of the structure of 4′,7,8-trihydroxyisoflavone 7-O-α-D-arabinofuranoside (namely A-76202, 1), a Rhodococcus metabolite showing potent inhibitory activities against the α-glucosidases of rat liver microsome (IC50 = 0.46 ng/mL), 26 analogs, each with minor variations at the sugar moiety and the isoflavone A and B rings, were readily synthesized. Notably, a new and efficient method was developed for the divergent synthesis of the B-ring congeners of the isoflavone glycosides by using Suzuki-Miyaura coupling as the final step. Modifications at the sugar moiety and the isoflavone A ring significantly diminish the activity, whereas variations at the B ring are largely tolerated for retaining the potent α-glucosidase inhibitory activity. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.