An improved procedure for the nitration of benzo-2,1,3-selenadiazoles and their reduction to<i>ortho</i>-phenylenediamines
作者:S. W. Wright、L. D. Mcclure
DOI:10.1002/jhet.5570410629
日期:2004.11
for the nitration of benzo-2,1,3-selenadiazoles using nitric acid dissolved in a mixture of methanesulfonic acid and phosphorus pentoxide at room temperature is presented. The SN2Ar displacement of fluoride that is observed when sulfuric acid is used as solvent is prevented and yields are high. Sodiumnitrate could be used in place of nitric acid with no loss in yield. Following nitration, the 2,1
提出了一种在室温下使用溶于甲磺酸和五氧化二磷混合物中的硝酸硝化苯并-2,1,3-硒代二唑的方法。当使用硫酸作为溶剂时观察到的氟化物的S N 2Ar置换得到防止,并且产率高。可以使用硝酸钠代替硝酸,而不会损失产率。硝化后,将2,1,3-硒代二唑环用氢碘酸裂解,得到3-硝基-邻-苯二胺。该方法适用于4-氟-3-硝基苯-1,2-二胺的多克制备。
Synthesis and in vitro Anticancer Activities of some Selenadiazole Derivatives
作者:Daniel Plano、Esther Moreno、María Font、Ignacio Encío、Juan Antonio Palop、Carmen Sanmartín
DOI:10.1002/ardp.201000014
日期:2010.11
non‐tumoral lines – one mammary (184B5) and one bronchial epithelium (BEAS‐2B) cell line. Assay‐based antiproliferative activity studies revealed that seven derivatives (2a, 2c, 2e, 2f, 2g, 3a, and 3b) exhibited good activity against MCF‐7 cells: for instance, 2c and 2f inhibited cell growth with nanomolar GI50 values. Compound 2f had a better antitumoral profile than vinorelbine and paclitaxel, two drugs
A triphenylphosphine-labile prodrug of seleno-combretastatin-4 was designed and synthesized, which was safe in circulating blood, could react with TPP to release CA-4 and a selenodiazole derivative, accompanying powerful anticancer properties.
Investigation of chalcogen bioisosteric replacement in a series of heterocyclic inhibitors of tryptophan 2,3-dioxygenase
作者:Arina Kozlova、Léopold Thabault、Nicolas Dauguet、Marine Deskeuvre、Vincent Stroobant、Luc Pilotte、Maxime Liberelle、Benoît Van den Eynde、Raphaël Frédérick
DOI:10.1016/j.ejmech.2021.113892
日期:2022.1
stability and cellular toxicity on TDO2-expressing cell lines. Overall, chalcogen isosteric replacements did not disturb the on-target activity but allowed for a modulation of the compounds' lipophilicity, toxicity and stability profiles. The present work contributes to our understanding of oxygen/sulfur/selenium isostery towards increasing structural options in medicinal chemistry for the development
Substituent Effect on Chalcogen Bonding in 5-Substituted Benzo[c][1,2,5]selenadiazoles and Their Copper(II) Complexes: Experimental and Theoretical Study
作者:Vusala A. Aliyeva、Atash V. Gurbanov、M. Fátima C. Guedes da Silva、Rosa M. Gomila、Antonio Frontera、Kamran T. Mahmudov、Armando J.L. Pombeiro
DOI:10.1021/acs.cgd.3c01209
日期:2024.1.17
on the electron donor or acceptor character of the functional group (R) at ∠R–Ch···Nu. Although Hammett’s para-substituent constant (σp) can be used for the quantitative description of substituent effects, herein, we found that due to participation of the substituents in various types of intermolecular interactions, there is no linear relationship between the σp of the substituent in R (X = −CH3, −H
与硫族原子 (Ch) 和亲核体 (Nu) 的性质平行,硫族键合 (ChB) 的强度和方向性也取决于∠R–Ch 处官能团 (R) 的电子供体或受体特征···努。虽然哈米特对取代基常数(σ p)可以用于定量描述取代基效应,但本文中,我们发现由于取代基参与各种类型的分子间相互作用,取代基的σ p之间不存在线性关系。 R 中的取代基(X = -CH 3、-H、-F、-Cl、-Br 和 -NO 2)和实验中的 Se ··· N 距离或 ∠N–Se ··· 5-取代中的 N 角苯并[ c ][1,2,5]硒二唑及其铜(II)络合物。理论上也没有观察到这种关系,通过考虑铜络合物中分子内氢键和硫族键的形成,可以合理地解释这种关系。利用“分子中原子”的量子理论结合非共价相互作用图和能量分解分析对硫族键进行了分析。