Palladium-Catalyzed Carbonylation Reaction of Aryl Bromides with 2-Hydroxyacetophenones to Form Flavones
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/chem.201202141
日期:2012.10.1
Flavone of the month: A general and efficient method for the palladium‐catalyzed carbonylativesynthesis of flavones has been developed (see scheme). Starting fromarylbromides and 2‐hydroxyacetophenones, the corresponding flavones have been isolated in good yields.
Identification and structure activity relationship of novel flavone derivatives that inhibit the production of nitric oxide and PGE 2 in LPS-induced RAW 264.7 cells
作者:Ji-Young An、Hwi-Ho Lee、Ji-Sun Shin、Hyung-Seok Yoo、Jong Seon Park、Seung Hwan Son、Sang Won Kim、Jihyun Yu、Jun Lee、Kyung-Tae Lee、Nam-Jung Kim
DOI:10.1016/j.bmcl.2017.03.057
日期:2017.6
In an effort to identify novel anti-inflammatory compounds, a series of flavone derivatives were synthesized and biologically evaluated for their inhibitory effects on the production of nitric oxide (NO) and prostaglandinE2 (PGE2), representative pro-inflammatory mediators, in LPS-induced RAW 264.7 cells. Their structure-activity relationship was also investigated. In particular, we found that compound
A highly efficient and selective Pd/C-catalyzed ligand-free cyclocarbonylation reaction for the synthesis of flavones has been developed. Various flavone derivatives were isolated in excellent yields with excellent functional group tolerances. Additionally, catalyst reuse experiments were performed successfully as well.
Lewis Acid-Triggered Selective Zincation of Chromones, Quinolones, and Thiochromones: Application to the Preparation of Natural Flavones and Isoflavones
作者:Lydia Klier、Tomke Bresser、Tobias A. Nigst、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1021/ja306178q
日期:2012.8.22
A Lewis acid-triggered zincation allows the regioselective metalation of various chromones and quinolones. In the absence of MgCl(2), a C(3) zincation is observed, whereas in the presence of MgCl(2) or a related Lewis acid, C(2) zincation occurs. Applications to a natural flavone, isoflavone, and quinolone are shown.