信号转导和转录激活因子 3 (STAT3) 蛋白是大多数癌症关键标志和促成因素的主要调节因子,包括细胞增殖和对 DNA 损伤的反应。G-四链体 (G4) 结构是在端粒和癌基因启动子处富集的四链非规范 DNA 结构。在癌细胞中,G4 DNA 的稳定导致复制压力和 DNA 损伤积累,因此被认为是肿瘤治疗的有希望的靶点。在这里,我们设计并合成了新型喹唑啉类化合物,它们同时并选择性地影响这两个公认的癌症靶标、G4 DNA 结构和 STAT3 蛋白。结合体外分析、核磁共振和分子动力学模拟,我们表明这些小的、不带电荷的化合物不仅与 STAT3 蛋白结合,而且还稳定 G4 结构。在人类培养的细胞中,这些化合物抑制 STAT3 的磷酸化依赖性激活,而不影响抗凋亡因子 STAT1 并导致 G4 结构的形成增加,正如使用 G4 DNA 特异性抗体所揭示的那样。结果,经过处理的细胞显示出较慢的 DNA 复制、DNA
A new way of forming the aza-o-xylylene with easily accessible 1,2-dihydroquinolines as precursor has been developed. The presence of an electron-donating group at the proper position of 1,2-dihydroquinoline was crucial for protonation of the alkene through dearomatization with a simple Brønsted acid. The in situ forming reactive intermediate was trapped with Hantzsch ester to afford tetrahydroquinolines
The catalytic enantioselective synthesis of tetrahydroquinolines containing all-carbon quaternary stereocenters via the formation of aza-ortho-xylylene with 1,2-dihydroquinoline as a precursor
Tetrahydroquinolines (THQs) with an all-carbon quaternary stereocenter were effectively obtained via the in situ formation of aza-ortho-xylylene (AOX) with easily accessible 1,2-dihydroquinolines as precursors.
Scope and Mechanistic Study of the Ruthenium-Catalyzed<i> ortho</i>-C−H Bond Activation and Cyclization Reactions of Arylamines with Terminal Alkynes
作者:Chae S. Yi、Sang Young Yun
DOI:10.1021/ja055608s
日期:2005.12.1
was found to be a highly effective catalyst for the C-H bond activation reaction of arylamines and terminalalkynes. The regioselective catalytic synthesis of substituted quinoline and quinoxaline derivatives was achieved from the ortho-C-H bond activation reaction of arylamines and terminalalkynes by using the catalyst Ru(3)(CO)(12)/HBF(4).OEt(2). The normal isotope effect (k(CH)/k(CD) = 2.5) was
affect these two well-recognized cancer targets, G4 DNA structures and the STAT3 protein. Using a combination of in vitro assays, NMR, and molecular dynamics simulations, we show that these small, uncharged compounds not only bind to the STAT3 protein but also stabilize G4 structures. In human cultured cells, the compounds inhibit phosphorylation-dependent activation of STAT3 without affecting the antiapoptotic
信号转导和转录激活因子 3 (STAT3) 蛋白是大多数癌症关键标志和促成因素的主要调节因子,包括细胞增殖和对 DNA 损伤的反应。G-四链体 (G4) 结构是在端粒和癌基因启动子处富集的四链非规范 DNA 结构。在癌细胞中,G4 DNA 的稳定导致复制压力和 DNA 损伤积累,因此被认为是肿瘤治疗的有希望的靶点。在这里,我们设计并合成了新型喹唑啉类化合物,它们同时并选择性地影响这两个公认的癌症靶标、G4 DNA 结构和 STAT3 蛋白。结合体外分析、核磁共振和分子动力学模拟,我们表明这些小的、不带电荷的化合物不仅与 STAT3 蛋白结合,而且还稳定 G4 结构。在人类培养的细胞中,这些化合物抑制 STAT3 的磷酸化依赖性激活,而不影响抗凋亡因子 STAT1 并导致 G4 结构的形成增加,正如使用 G4 DNA 特异性抗体所揭示的那样。结果,经过处理的细胞显示出较慢的 DNA 复制、DNA