Reactivity of Selenocystine and Tellurocystine: Structure and Antioxidant Activity of the Derivatives
作者:Kandhan Satheeshkumar、Saravanan Raju、Harkesh B. Singh、Ray J. Butcher
DOI:10.1002/chem.201803776
日期:2018.11.27
these amino acids, i.e., oxidation of 5 and 6, has been performed at various pH values. Hydrogen peroxide was used as an oxidant and it was treated with 5 and 6 in excess in acidic and basic media. Compound 5, upon oxidation, afforded SeIV and SeVI products. Selenocysteic acid [HO3SeCH2CH(NH2)COOH] 9, a novel SeVI compound, was isolated and characterised by single‐crystal X‐ray diffraction studies. In
已经制备了l-硒代胱氨酸(5)和l- tellurocystine(6),并且已经在各种pH值下进行了这些氨基酸的反应,即5和6的氧化。使用过氧化氢作为氧化剂,并在酸性和碱性介质中用过量的5和6处理过氧化氢。化合物5经氧化,得到Se IV和Se VI产物。Selenocysteic酸[HO 3 SECH 2 CH(NH 2)COOH] 9,一种新型的硒VI通过单晶X射线衍射研究对化合物进行了分离和表征。相比之下,l- tellurocystine在被H 2 O 2氧化后可得到Te II和Te IV产物。分离出两性离子有机碲酸(IV)[TeCl 3 CH 2 CH(NH 3)COOH] 13并通过NMR和IR光谱,质谱和元素分析对其进行表征。化合物13在正交晶空间群中结晶。l蛋氨酸胱氨酸,当被NaBH 4还原时产生所需的碲酸酯中间体,将其用溴乙酸捕获。此外,还合成了l和d碲半胱氨酸衍生物,[(RTeCH