Efficient Heck cross-coupling of 3-iodo-benzopyrones with olefins under microwave irradiation without phosphine
作者:Yikai Zhang、Zhiliang Lv、Hanyu Zhong、Mingfeng Zhang、Tao Zhang、Wannian Zhang、Ke Li
DOI:10.1016/j.tet.2012.09.017
日期:2012.11
different terminal olefins with various 3-iodo-benzopyrones including stericallyhindered, electron-rich, electron-neutral, and electron-deficient is developed. It proceeded faster and generally gave good to excellent yields under microwave irradiation, phosphine-free, and air condition. The reaction could render this method particularly attractive for the efficient preparation of biologically and
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
Synthesis of 3-Iodo Derivatives of Flavones, Thioflavones and Thiochromones
作者:Fang Jie Zhang、Yu Lin Li
DOI:10.1055/s-1993-25904
日期:——
The title compounds, 2-aryl-3-iodo-4H-1-benzopyrans and 2-alkyl-or 2-aryl-3-iodo-4H-1-benzothiopyrans, were prepared by reaction of the corresponding heterocyclic derivatives with the iodine-cerium(IV) ammonium nitrate system under mild conditions. The scope and proposed mechanism of the reaction were also demonstrated.
Vinyl radicals were generated from 3-iodoflavones under a mercury lamp and tandem cyclization reactions occurred with five-membered heteroarenes entailing two consecutive C–C bond formations to synthesize benzo[e]chromeno[2,3-g]indol-13(1H)-one derivatives. The tandem cyclization reactions worked in acetonitrile without any additives such as transition metals, ligands and oxidants, giving rise to a
在汞灯下由3-碘黄酮生成乙烯基自由基,并且与五元杂芳烃发生串联环化反应,需要两个连续的CC键形成,以合成苯并[ e ] chromeno [2,3 - g ]吲哚-13(1 H))-一阶导数。串联环化反应在乙腈中进行,没有任何添加剂,例如过渡金属,配体和氧化剂,在温和且环境友好的反应条件下,以高收率产生了各种各样的新型多环x吨酮骨架。
Heck Cross-Coupling Reactions in Ionic Liquid mediated Pd Nanocatalysts
作者:Prashant Gautam、Vivek Srivastava
DOI:10.2174/1570178617999200723124636
日期:2021.5
of palladium nanoparticles by using a series of palladium metal precursors and ionicliquids. All the materials went for XRD, TEM, and ICPOES analysis, before going to Heck cross-coupling reaction as a catalyst. We evaluated the catalytic performance of our developed IL#Pd MNP catalyst over Heck cross-coupling reaction between different terminal olefins with various 3-iodo-benzopyrones, including sterically