氧化应激不断参与范围不断扩大的神经退行性疾病的发病机制。因此,将细胞氧化应激有效抑制为氧化还原稳态是治疗或至少延缓此类疾病进展的有希望且可行的策略。Nrf2的,细胞抗氧化反应机的主协调器,负责解毒和补偿有害氧化应激通过多种抗氧化生物分子的转录激活。在我们对披露干扰细胞氧化还原调节机制的小分子的持续兴趣的框架内,我们在此报告了 47 种带有乙烯基砜支架的小分子的合成、优化和生物学评估,所有这些都对 H 表现出强大的神经保护作用2 O 2介导的PC12细胞损伤。经过初步筛选,最有效的神经保护化合物9b和9c选择具有边缘细胞毒性的细胞进行后续研究。我们的结果表明,它们的神经保护作用归因于一组抗氧化基因和相应基因产物的上调。进一步的机制研究表明,Nrf2 对9b和9c的细胞性能是必不可少的,这是由于 Nrf2 基因的沉默大大抵消了它们的保护作用。总之,在这项工作中发现的9b和9c值得进一步开发,作
Electrosynthesis of (<i>E</i>)-Vinyl Sulfones Directly from Cinnamic Acids and Sodium Sulfinates via Decarboxylative Sulfono Functionalization
作者:Peng Qian、Meixiang Bi、Jihu Su、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/acs.joc.6b00661
日期:2016.6.3
A variety of (E)-vinyl sulfones were constructed directly from cinnamic acids and sodium sulfinates with high regioselectivity at room temperature by virtue of an electrocatalytic oxidation. A radical intermediate was detected, and the corresponding mechanism was investigated.
Synthesis of Unfunctionalized Carbonated Fragments Containing Two Vicinal Chiral Centers: Stereocontrolled Benzylation of Vinylsulfones Mediated by a Remote Sulfinyl Group
作者:José Luis García Ruano、Christine Schöpping、Cuauhtémoc Alvarado、José Alemán
DOI:10.1002/chem.201001006
日期:——
One‐pot benzylation of (E)‐vinylsulfones with optically pure 2‐p‐tolylsulfinylbenzyl carbanions and desulfinylation with tBuLi, followed by desulfonylation of the resulting 1‐sulfonylpropanes, provided acyclic hydrocarbons containingtwo connected chiralcenters in very smooth conditions and almost complete control of the stereoselectivity (see scheme).
An efficient Mn(III)-mediated coupling reaction of sodium sulfinates with nitro-olefins has been developed, this reaction proceeds in mild and open-flask conditions to afford (E)-vinylsulfones with high regioselectivities and in good to excellent yields. The control experiments revealed that this transformation could involve a radical process.
metal-free decarboxylative sulfonylation protocol for the preparation of (E)-vinyl sulfones from of β-aryl-α,β-unsaturated carboxylicacids using sodium sulfinates and (diacetoxyiodo)benzene (PhI(OAc)2) was developed. This strategy offers a simple and expedient synthesis of (E)-vinyl sulfones bearing a wide variety of functional groups. A radical-based pathway has been proposed for this decarboxylative sulfonylation