天然产物金鱼草素 D 是一种法尼基化喹诺酮生物碱,已知其具有抗疟疾病原体疟原虫属的活性。在这项研究中,我们表明金鱼草素 D 也能抑制其他寄生原生动物。虽然 aurachin D 对布氏锥虫罗得西亚锥虫只有适度的影响,但在体外试验中,另外两种锥虫,克氏锥虫和杜氏利什曼原虫,分别在低微摩尔和纳摩尔浓度下被杀死。经测定,aurachin D 的 IC50 值甚至低于参比药物苯并咪唑和米替福新的 IC50 值。由于这些有希望的结果,我们着手探索结构修饰对这种天然产物生物活性的影响。为了生成在 C-2 具有不同取代基的金鱼草素 D 衍生物,喹诺酮环系统的 C-6 和 C-7 位置,我们使用能够进行金黄色素型异戊二烯化的重组大肠杆菌菌株进行全细胞生物转化。将具有甲基、甲氧基和卤素基团的喹诺酮前体分子喂入该大肠杆菌菌株,该菌株将底物转化为所需的类似物。与 aurachin D 相比,所生成的衍生物均未表
variety of polysubstituted trans-2,3-dihydropyrroles from a wide range of chalcones and β-enamine ketones (esters) via iodine-promoted tandem Michael/cyclization sequence has been developed, affording the desired products in moderate to excellent yields. This methodology is a highly efficient, convenient way to access functionalized 2,3-dihydropyrroles from readily accessible substrates under mild reaction
Reaction of N-sulfonyl-1,4-benzoquinone imines with enamines
作者:S. A. Konovalova、A. P. Avdeenko、V. V. Pirozhenko、A. L. Yusina、G. V. Palamarchuk、S. V. Shishkina
DOI:10.1134/s1070428017040054
日期:2017.4
4-benzoquinone imine reacted with enamines to give 1,4-addition products and products of their subsequent cyclization, substituted 5-aminobenzofurans and 5-aminoindoles, depending on the solvent nature, electron-withdrawing power of the substituent on the quinone imine nitrogen atom, and enamine structure. The presence of strong electron-withdrawing trifluoromethanesulfonyl group on the quinone imine nitrogen
Design of a graphene oxide-SnO<sub>2</sub> nanocomposite with superior catalytic efficiency for the synthesis of β-enaminones and β-enaminoesters
作者:Aniket Kumar、Lipeeka Rout、Rajendra S. Dhaka、Saroj L. Samal、Priyabrat Dash
DOI:10.1039/c5ra03363b
日期:——
A graphene–SnO2 nanocomposite has been synthesized by a solvothermal method, which is a more effective and less time-consuming catalyst for the synthesis of β-enaminones and β-enaminoesters.
Simultaneous different mechanisms for the efficient synthesis of <i>β</i>-enaminones: 12-tungstocobaltic acid-supported on nano silica as an electron transfer and Brønsted acid nano catalyst
作者:Mahtab Razlansari、Masoud Kahrizi
DOI:10.1515/znb-2023-0045
日期:2024.2.26
12-tungestocobaltic acid, H5CoW12O40, was immobilized on nano silica from rice husk (CoW@NSiO2) to develop a novel, efficient, heterogeneous and recyclable nano catalyst for the synthesis of β-enaminones. It is apparent from acidity and cyclic voltammetric measurements that, the catalyst is electroactive and undergoes reversible redox transitions, as well as it is contains strong acid sites and mobile