Scope of the copper catalyzed/mediated selenium-nitrogen coupling reaction has been studied for the synthesis of isoselenazolones. It is noticed that the 2-chloro, 2-bromo-, and 2-iodo-aryl amides substrates can be exploited in the selenium-nitrogen coupling reaction by employing 25-100 mol % of CuI/1,10-phenanthroline (L) and potassium carbonate as a base in DMF. Furthermore, electron rich 2-chloro-arylamides also underwent selenium-nitrogen coupling reaction to give biologically important selenium-nitrogen heterocycles. Also, copper-catalyzed selenium-nitrogen coupling reaction has been meticulously applied for the synthesis of diaryl diselenides having methoxy, amine, and amide functionality from respective aryl iodides in the presence of stoichiometric amount of succinimide as an external Se-N coupling partner. (C) 2011 Elsevier Ltd. All rights reserved.
Osajda; Kloc; Mlochowski, Polish Journal of Chemistry, 2001, vol. 75, # 6, p. 823 - 830
作者:Osajda、Kloc、Mlochowski、Piasecki、Rybka
DOI:——
日期:——
Amide-Based Glutathione Peroxidase Mimics: Effect of Secondary and Tertiary Amide Substituents on Antioxidant Activity
作者:Krishna P. Bhabak、Govindasamy Mugesh
DOI:10.1002/asia.200800483
日期:2009.6.2
sec‐ and tert‐amide substituted diselenides have been synthesised as synthetic mimics of glutathioneperoxidase (GPx), characterized, and studied for their antioxidantactivities using H2O2, Cum‐OOH, and tBuOOH as substrates and PhSH as thiol co‐substrate. The substitution at the free NH group of the amide moiety in the sec‐amide based diselenides is shown to enhance the GPx activity.
Sec 或 terts:已合成了一系列sec和tert酰胺取代的二硒化物作为谷胱甘肽过氧化物酶 (GPx) 的合成模拟物,使用 H 2 O 2、Cum-OOH 和t BuOOH 作为合成模拟物,对其抗氧化活性进行了表征和研究底物和PhSH作为硫醇共底物。显示基于仲酰胺的二硒化物中酰胺部分的游离 NH 基团的取代可增强 GPx 活性。
Regioselective syntheses of substituted thioxanthen- and selenoxanthen-9-one derivatives.
Various methoxy-substituted thioxanthen-9-one derivatives were regioselectively synthesized by a one-pot condensation of S-lithiated thiosalicylic ester or amides, obtained via directed lithiation of tertiary benzamides, with benzynes. Similarly, the synthesis of selenoxanthen-9-ones was achieved.