Synthesis of the First Selenium-Containing Acyclic Nucleosides and Anomeric Spironucleosides from Carbohydrate Precursors
作者:Susana Maza、Óscar López、Sergio Martos、Inés Maya、José G. Fernández-Bolaños
DOI:10.1002/ejoc.200900793
日期:2009.10
We report the synthesis of acyclic and spiranic imidazole-derived C-selenonucleosides. 5-Hydroxy-4-tetrahydroxybutyl imidazolidine-2-selones, a novel class of acyclic selenonucleosides, were transformed into (tetrahydroxybutylimidazol-2-yl)diselenide, by acetylation and chemoselective N-deacetylation with methanolic imidazole. Furthermore, the synthesis of a new class of conformationally restricted
Synthesis of sugar-derived isoselenocyanates, selenoureas, and selenazoles
作者:Óscar López、Susana Maza、Víctor Ulgar、Inés Maya、José G. Fernández-Bolaños
DOI:10.1016/j.tet.2009.01.038
日期:2009.3
Aryl, alkyl, and sugar-derived isoselenocyanates were prepared by a one-pot procedure starting from the corresponding formamides, using triphosgene as a dehydrating agent, triethylamine, and black selenium powder. The preparation of sugar selenoureas by coupling of O-protected sugar-derived isoselenocyanates with different amines, and by coupling of unprotected glycopyranosyl amines with phenyl isoselenocyanate
Synthesis and antioxidant activity of O-alkyl selenocarbamates, selenoureas and selenohydantoins
作者:Penélope Merino-Montiel、Susana Maza、Sergio Martos、Óscar López、Inés Maya、José G. Fernández-Bolaños
DOI:10.1016/j.ejps.2012.12.016
日期:2013.2
scavengers using colorimetric methods; furthermore, their glutathione peroxidase-like activity has also been analyzed by NMRspectroscopy. Free radical scavenging activity has been evaluated using the DPPH method; the strongest free radical scavengers were found to be both, aryl- and sugar-derived selenoureas, with EC50 values ranging 19–46 μM. Concerning anti-H2O2 activity, measured by the horseradish peroxidase-mediated
为了评估它们的体外活性,已经进行了三种不同亲脂性有机硒化合物的制备(芳基和糖衍生的硒脲,O-烷基硒代氨基甲酸酯和硒代乙内酰脲)。抗氧化特性,分析含硒官能团以及取代基对活性的影响。因此,使用比色法首次研究了标题化合物作为自由基,过氧化氢,烷基过氧化物和一氧化氮清除剂;此外,它们的谷胱甘肽过氧化物酶样活性也已通过NMR光谱分析。使用DPPH方法评估了自由基清除活性;发现最强的自由基清除剂是芳基和糖衍生的硒脲,其EC 50值为19-46μM。关于抗H 2 O 2通过辣根过氧化物酶介导的酚红氧化活性测定,芳基硒代乙内酰脲获得了最佳结果,在浓度为0.5 mM时显示61-76%的抑制作用。还发现有机硒化合物能够抑制涉及脂质过氧化的链反应(硫氰酸铁法);因此,当以0.74 mM的浓度进行测试时,硒代氨基甲酸酯糖对烷基过氧化物介导的亚油酸降解表现出49-71%的抑制作用。通过将硝普钠转变为亚硝酸根离子来研