Hypervalent Iodine-Induced Nucleophilic Substitution of para-Substituted Phenol Ethers. Generation of Cation Radicals as Reactive Intermediates
摘要:
A novel hypervalent iodine induced nucleophilic substitution of para-substituted phenol ethers in the presence of a variety of nucleophiles is described. UV and ESR spectroscopic studies indicate that this reaction proceeds via cation radicals, [ArH.+], as reactive intermediates generated by single-electron transfer (SET) from a charge-transfer (dT) complex of phenol ethers with phenyliodine(III) bis(trifluoroacetate) (PIFA). This is the first case that involves a radical intermediate on hypervalent iodine oxidations of aromatic compounds.
孕烷 X 受体 (PXR) 是药物代谢的关键调节因子。许多药物结合并激活 PXR,导致药物不良反应。这表明PXR抑制剂具有治疗价值,但迄今为止缺乏有效的PXR抑制剂。在此,我们报告了一系列 1 H -1,2,3-三唑-4-甲酰胺化合物的结构优化,从而发现化合物85作为 PXR 的选择性且最有效的反向激动剂和拮抗剂,具有低结合和细胞活性的纳摩尔 IC 50值。重要的是,化合物89是85的密切类似物,是一种选择性纯拮抗剂,其结合和细胞活性具有低纳摩尔 IC 50值。这项研究为基础研究和未来的临床研究提供了新型、选择性和最有效的 PXR 抑制剂(双重反向激动剂/拮抗剂和纯拮抗剂),并揭示了如何降低化合物与 PXR 的结合亲和力。
Combinatorial synthesis of new fluorescent scaffolds using click chemistry
作者:Felix Cleemann、Wendy Loa Kum-Cheung、Peter Karuso
DOI:10.1016/j.tetlet.2021.153520
日期:2022.1
bio-orthogonal functional groups that can be readily coupled using copper(I)- or ruthenium(II)- catalyzed 1,3-dipolar cycloaddition reactions. Using non-fluorescent aromatic azides and aromatic acetylenes, covering a range of electron rich and poor building blocks, the Huisgen cycloaddition afford 1,4-disubstituted or 1,5-disubstituted 1,2,3-triazoles. Using a combinatorial approach by running reaction in parallel
Synthesis and Antitumor Activity of 1-Substituted 1,2,3-Triazole-Mollugin Derivatives
作者:Han Luo、Yong-Feng Lv、Hong Zhang、Jiang-Miao Hu、Hong-Mei Li、Shou-Jin Liu
DOI:10.3390/molecules26113249
日期:——
A new series of mollugin-1,2,3-triazole derivatives were synthesized using a copper(I)-catalyzed Huisgen 1,3-dipolar cycloaddition reaction of corresponding O-propargylated mollugin with aryl azides. All the compounds were evaluated for their cytotoxicity on five human cancer cell lines (HL-60, A549, SMMC-7721, SW480, and MCF-7) using MTS assays. Among the synthesized series, most of them showed cytotoxicity
Phosphorylation of derivatives of β-dialkyaminocrotonitriles with phosphorus(III) halides
作者:Aleksandr N. Kostyuk、Yurii V. Svyaschenko、Bogdan B. Barnych、Dmitriy A. Sibgatulin、Eduard B. Rusanov、Dmitriy M. Volochnyuk
DOI:10.1002/hc.20532
日期:——
reaction of β-dialkylaminocrotontriles with phosphorus(III) halides has been investigated. The basicity of the dialkylamino group influences the phosphorylation markedly, with pyrrolidine being the amine of choice. It was found that a solvent and the ratio of triethylamine play a significant role in phosphorylation. Although chloro- and dichlorophosphine derivatives proved impossible to separate as individual
Fast dye salts provide fast access to azidoarene synthons in multi-step one-pot tandem click transformations
作者:James T. Fletcher、Jacqueline E. Reilly
DOI:10.1016/j.tetlet.2011.08.069
日期:2011.10
commercially available diazonium salts could be used as efficient aromatic azide precursors in one-pot multi-step click transformations. Seven different diazonium salts, including FastRed RC, Fast Blue B, Fast Corinth V and Variamine Blue B were surveyed under aqueous click reaction conditions of CuSO4/Na ascorbate catalyst with 1:1 t-BuOH/H2O solvent. Two-step tandem reactions with terminal alkyne
该研究检查了市售的重氮盐是否可以用作一锅多步点击转化中的有效芳香叠氮化物前体。在CuSO 4 /Na 抗坏血酸盐催化剂与1:1 t- BuOH/H 2 O 溶剂的点击反应条件下,对七种不同的重氮盐,包括固红RC、固蓝B、固克林斯V 和Variamine Blue B 进行了研究。与末端炔烃和二炔共反应物的两步串联反应产生了 1,2,3-三唑产物,产率为 66-88%,而与三甲基甲硅烷基保护的炔烃和二炔共反应物的三步串联反应产生了 1, 2,3-三唑产品的产率为 61-78%。
Synthesis and Anticancer Activity of 11-azaartemisinin Derivatives Bearing 1,2,3-triazole Moiety
作者:Dung Tien Nguyen、Thuong Hanh Ngo、Hien Thu Tran、Thao Phuong Dinh、Phuong Thi Do、Hau Ba Nguyen、Linh Thi Phuong Tran、Hanh My Ta
DOI:10.1007/s10593-021-03019-w
日期:2021.10
evaluated for their cytotoxic activity against KB and HepG2 cell lines. All synthesized artemisinin derivatives are more active than 11-azaartemisinin. Thirteen of the synthesized compounds displayed good cytotoxic activity against two human cancer cell lines, KB and HepG2, with half maximal inhibitory concentration values in a range of 4.27–70.40 μM. The most active derivative was the best to both KB and