Beitrag zur Kenntnis der 2-Aryl-benzopyryliumsalze
作者:Ch. Michaelidis、R. Wizinger
DOI:10.1002/hlca.19510340608
日期:——
DurchKondensationvon Cumarin und 7-Oxycumarin mit Phenolen, Phenoläthern und tertiären aromatischenAminen sowie durchKondensationvon α-Oxyaldehyden mit Acetophenonen wird eine Anzahl neuer 2-Aryl-benzopyryliumsalze dargestellt. Es ergibt sich, dass das 2-Phenylbenzopyryliumion ein sehr stark auxochromempfindliches System ist.
Durch Kondensation von Cumarin and 7-Oxycumarin mit Phenolen,苯酚和叔丁基香精Aminen sowie durch Kondensation vonα-Oxyaldehydenmit Acetophenonen wird eine Anzahl neuer 2-Aryl-benzopyryliumsalze dargestellt。Es ergibt sich,dass das 2-Phenylbenzopyryliumion ein sehr stark auxochromempfindliches System ist。
Pharmaceutical compositions
申请人:Inverni Della Beffa S.p.A.
公开号:US04258055A1
公开(公告)日:1981-03-24
Valuable pharmaceutical properties of flavylium salts are described, including anti-inflammatory, vaso-protective, hypolipaemic, hypocholesterolaemic and hypoglycaemic activity. The use of flavylium salts as drugs and the production of pharmaceutical compositions containing them is particularly referred to.
Flavyliumsalts and 2-hydroxychalcones (1-phenyl-3-(2-hydroxyphenyl)-2-propen-1-ones) react with hydroxylamine in pyridine to form 2,5-dihydroisoxazoles. These undergo thermal and acid-catalyzed rearrangements to isomeric 4,5-dihydroisoxazoles and chalcone oximes, respectively. With hydrazine, flavyliumsalts yield phenolic 4,5-dihydro-3,5-diphenyl-1H-pyrazoles. Since these readily condense with acetone
Antiradical and reductant activities of anthocyanidins and anthocyanins, structure–activity relationship and synthesis
作者:Hussein M. Ali、Wafaa Almagribi、Mona N. Al-Rashidi
DOI:10.1016/j.foodchem.2015.09.003
日期:2016.3
Eight anthocyanidins, seven anthocyanins and two synthesized 4'-hydroxy flavyliums were examined as hydrogen donors to DPPH, ABTS and hydroxyl radicals, and as electron donors in the FRAP assay. Most compounds gave better activities than trolox and catechol. A structure-activity relationship (SAR) study showed that, in the absence of the 3-OH group, radicals of the 4, 5 or 7-OH groups can only be stabilized by resonance through pyrylium oxygen, while 3-OH group improved hydrogen atom donation because of the stabilization by anthocyanidin semiquinone-like resonance. Electron donation was also enhanced by the 3-OH group. Both anthocyanidins and their respective anthocyanins showed similar trends and close activities. Different types of sugar unit bonded to the 3-OH group or counter ion had minor effect on activities. The catechol structure improved both hydrogen and electron donation. Compounds lacking the catechol structure had a decreasing order of H-atom and electron donation (Mv > Pn > Pg > Ap > 4'-OH-flavylium) consistent with the decreasing number of their hydroxyl and/or methoxy groups. (C) 2015 Elsevier Ltd. All rights reserved.
Hayashi, Acta Phytochimica, 1943, vol. 8, p. 179,190