Microwave-assisted synthesis and antimicrobial activities of flavonoid derivatives
作者:Sherif B. Abdel Ghani、Louise Weaver、Zidan H. Zidan、Hussein M. Ali、C. William Keevil、Richard C.D. Brown
DOI:10.1016/j.bmcl.2007.11.081
日期:2008.1
Eleven flavonoid derivatives were synthesised using a modified Baker-Venkataraman rearrangement, and subsequent microwave-assisted closure of the heterocyclic ring. All of the synthetic compounds displayed antifungal activity against Aspergillus niger and Fusarium oxysporium, and two of the synthetic flavonoid analogues exhibited significant activity against methicillin-resistant Staphylococcus aureus
A visible-light-induced photocatalytic strategy for the synthesis of flavonoids has been developed through the deoxygenative/cyclization reaction of salicylic acid derivatives with aryl acetylene using diphenyl sulfide as an O-transfer reagent. Based on the controlled experiments, the mechanism of visible-light-induced free radical coupling cyclization was proposed. The protocol obtained 51 flavonoids
In this work, we demonstrated a novel electrochemical oxidative cyclization for synthesis of flavone from 2’-hydroxychalcone using an inexpensive using low toxic NaI as mediator/electrolyte without external additives in EtOH/water solvent. The key features of this reaction include its broad substrate scope, scalability, ability to operate with benign solvent at room temperature, and no requirement
在这项工作中,我们展示了一种新型电化学氧化环化方法,用于从 2'-羟基查耳酮合成黄酮,使用廉价的低毒 NaI 作为介体/电解质,无需外部添加剂,在乙醇/水溶剂中。该反应的主要特点包括底物范围广泛、可扩展性、能够在室温下使用良性溶剂进行操作,并且不需要强氧化剂和外部添加剂。
One-pot synthesis of 3-haloflavones from flavones using Oxone® and potassium halide as a halogenation reagent
作者:Tao Peng、Gang Wang、Shouguo Zhang、Yunbo Sun、Shuchen Liu、Lin Wang
DOI:10.1016/j.tetlet.2019.151511
日期:2020.2
A two-step, one-pot method has been developed for the synthesis of 3-haloflavones from the corresponding flavones. The method uses Oxone® and potassium halide to produce the active molecular halogen in situ. The solvent (methanol) then participates in the reaction to afford the 2-methoxy-3-haloflavanone derivative. After adding sodium hydroxide, the corresponding 3-haloflavone product is obtained in
Peptoid Helix Displaying Flavone and Porphyrin: Synthesis and Intramolecular Energy Transfer
作者:Woojin Yang、Junhyuk Jo、Hyeongyeol Oh、Hohjai Lee、Won-jin Chung、Jiwon Seo
DOI:10.1021/acs.joc.9b02358
日期:2020.2.7
distinct intramolecularenergytransfer was observed from 7-MF to porphyrin with greater efficiency in the helix than that in the loop conformation of the peptoid, whereas no clear evidence of energytransfer was obtained for unstructured FPPC. We thus demonstrate the value of the helical peptoid, which provided a controlled orientation for 7-MF and porphyrin and modulated the energytransfer efficiency