Versatile and Expeditious Synthesis of Aurones via Au<sup>I</sup>-Catalyzed Cyclization
作者:Hassina Harkat、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/jo702197b
日期:2008.2.1
Aurones are conveniently formed in a three-step procedure including a goldI-catalyzed cyclization of 2-(1-hydroxyprop-2-ynyl)phenols as a highly regio- and stereoselective key step. A wide diversity of derivatives can be obtained starting from substituted salicylaldehydes. Synthesis of natural 4,6,3‘,4‘-tetramethoxyaurone and structure revision of two natural products (dalmaisione D and 4‘-chloroaurone)
Synthesis, structural revision, and biological activities of 4′-chloroaurone, a metabolite of marine brown alga Spatoglossum variabile
作者:Somepalli Venkateswarlu、Gopala K. Panchagnula、Aditya L. Gottumukkala、Gottumukkala V. Subbaraju
DOI:10.1016/j.tet.2007.04.048
日期:2007.7
along with six structural analogs. The products obtained were Z-isomers and these were converted into E-isomers by photoisomerization. The E and Z isomers of aurones showed distinct proton and carbon chemical shifts. However, the spectroscopic data of either Z-4′-chloroaurone (1a) or its E-isomer (2a) did not match with those reported for the natural product and thus requires revision of the structure
4'-Chloroaurone(1a),是唯一从海洋来源获悉的金盏花,Spatoglossum variabile是由2-羟基苯乙酮与六个结构类似物合成的。所得产物为Z-异构体,并且通过光异构化将其转化为E-异构体。黄金的E和Z异构体表现出明显的质子和碳化学位移。但是,Z -4'-chloroaurone(1a)或它的E-异构体(2a)的光谱数据)与报告的天然产品不匹配,因此需要修改指定的结构。报道的天然产物的质子NMR光谱数据与已知的异香豆素报道的数据相符(5)。评估了合成的E和Z的金黄色元素的抗氧化和抗菌活性。所述金酮Z -2-[(3,4-二羟基苯基)亚甲基]苯并[ b ]呋喃-3-酮具有显着的抗氧化活性。有趣的是,Z-金黄色素对革兰氏阳性和革兰氏阴性细菌有活性,而相应的E-金黄色素是无活性的。
Patonay, T.; Litkei, Gy.; Bognar, R., Acta Chimica Academiae Scientiarum Hungaricae, 1981, vol. 108, # 2, p. 135 - 146
作者:Patonay, T.、Litkei, Gy.、Bognar, R.
DOI:——
日期:——
Construction of the flavones and aurones through regioselective carbonylative annulation of 2-bromophenols and terminal alkynes
The easily available and efficient catalyst containing a benzimidazolium ligand and PdCl2(PPh3)(2) demonstrated excellent catalytic activity to construct the flavones and aurones, respectively. This reaction can be operated under mild conditions, affording the desired products in moderate to good yields. This protocol was used to prepare the flavones and aurones by a slight modification of amines. (C) 2013 Elsevier Ltd. All rights reserved.
Aurones: Unexplored Visible‐Light Photoswitches for Aqueous Medium
作者:Daria V. Berdnikova
DOI:10.1002/chem.202304237
日期:2024.4.5
Aurone derivatives have been introduced for the first time as a novel class of visible-light photoswitches in aqueous medium possessing good quantum yields, high conversions in photostationary states and remarkably long (up to 7 years) lifetimes of the photoisomers. Moreover, the aurone scaffold can be easily modified with functional substituents without affecting its robust photochemical performance