Selective and efficient oxidative modifications of flavonoids with 2-iodoxybenzoic acid (IBX)
摘要:
2-Iodoxybenzoic acid (IBX), a mild and efficient hypervalent iodine oxidant, has been utilised in different reaction conditions to perform several efficient oxidative modifications of flavonoids. Fine-tuning of the reaction conditions allowed remarkably selective modifications of these compounds. At room temperature, IBX proved to be an excellent reagent for a highly regioselective aromatic hydroxylation of monohydroxylated flavanones and flavones, generating the corresponding catecholic derivatives showing high antioxidant activity. At 90 degrees C, IBX efficiently dehydrogenated a large panel of methoxylated flavanones to their corresponding flavones exhibiting anticancer activity. IBX polystyrene has also been utilised to increase the recovery of highly polar compounds. Following the first oxidation, the reagent was recovered and reused in several runs without loss of efficiency and selectivity. The first example of an application of IBX polystyrene in a dehydrogenation reaction has been described. (c) 2010 Elsevier Ltd. All rights reserved.
Selective and efficient oxidative modifications of flavonoids with 2-iodoxybenzoic acid (IBX)
摘要:
2-Iodoxybenzoic acid (IBX), a mild and efficient hypervalent iodine oxidant, has been utilised in different reaction conditions to perform several efficient oxidative modifications of flavonoids. Fine-tuning of the reaction conditions allowed remarkably selective modifications of these compounds. At room temperature, IBX proved to be an excellent reagent for a highly regioselective aromatic hydroxylation of monohydroxylated flavanones and flavones, generating the corresponding catecholic derivatives showing high antioxidant activity. At 90 degrees C, IBX efficiently dehydrogenated a large panel of methoxylated flavanones to their corresponding flavones exhibiting anticancer activity. IBX polystyrene has also been utilised to increase the recovery of highly polar compounds. Following the first oxidation, the reagent was recovered and reused in several runs without loss of efficiency and selectivity. The first example of an application of IBX polystyrene in a dehydrogenation reaction has been described. (c) 2010 Elsevier Ltd. All rights reserved.
Several classes of flavonoids (flavones, flavanones, 2'-hydroxychalcones and flavan-4-ols) having a variety of substituents on A ring were investigated for their antiproliferativeactivity against MCF-7 human breast cancer cells. Structure-activity relationships of these compounds were discussed. 2'-hydroxychalcones and methoxylated flavanones were found to be potent inhibitors of MCF-7 cells growth
Shinoda, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1928, vol. 48, p. 35
作者:Shinoda
DOI:——
日期:——
Starkov, S. P.; Polyanskaya, N. L.; Volkotrub, M. N., Journal of general chemistry of the USSR, 1982, vol. 52, # 6, p. 1214 - 1217
作者:Starkov, S. P.、Polyanskaya, N. L.、Volkotrub, M. N.
DOI:——
日期:——
Ishwar-Dass et al., Proceedings - Indian Academy of Sciences, Section A, 1953, # 37, p. 599,608
作者:Ishwar-Dass et al.
DOI:——
日期:——
[EN] NUCLEIC ACID COMPOUNDS FOR INHIBITING FOS GENE EXPRESSION AND USES THEREOF<br/>[FR] COMPOSÉS D'ACIDE NUCLÉIQUE POUR INHIBER L'EXPRESSION DU GÈNE FOS ET UTILISATIONS DE CEUX-CI
申请人:MDRNA INC
公开号:WO2008109454A2
公开(公告)日:2008-09-12
(EN) The present disclosure provides meroduplex ribonucleic acid molecules (mdRNA) capable of decreasing or silencing FOS gene expression. An mdRNA of this disclosure comprises at least three strands that combine to form at least two non-overlapping double-stranded regions separated by a nick or gap wherein one strand is complementary to a FOS mRNA. In addition, the meroduplex may have at least one uridine is a 5-methyluridine, a nucleoside is a locked nucleic acid, or optionally other modifications, and any combination thereof. Also provided are methods of decreasing expression of a FOS gene in a cell or in a subject to treat a FOS-related disease.(FR) L'invention concerne des molécules d'acide ribonucléique méroduplex (ARNmd) pouvant diminuer ou étouffer l'expression du gène FOS. Un ARNmd de cette description comprend au moins trois brins qui s'associent pour former au moins deux régions double brin non chevauchantes séparées par une encoche ou un espace dans lequel un brin est complémentaire à un ARNm FOS. De plus, le méroduplex peut avoir au moins une uridine qui est une 5-méthyluridine, un nucléoside qui est un acide nucléique bloqué, ou éventuellement d'autres modifications, et toute combinaison de ceux-ci. Sont également proposés des procédés de diminution de l'expression d'un gène FOS dans une cellule ou chez un sujet pour traiter une maladie liée au FOS.