Structure-activity relationship studies of (E)-3,4-dihydroxystyryl alkyl sulfones as novel neuroprotective agents based on improved antioxidant, anti-inflammatory activities and BBB permeability
摘要:
(E)-3,4-双羟基苯基甲基硫醚作为神经退行性疾病药的新类同代物被设计并合成。生物测试结果表明,在清除自由基以及抗炎性反应中,大多数目标化合物保持了抗氧化和抗炎活性,从而保护神经细胞免受H2O2、6-羟基多巴胺和其他抗生物素药物等神经毒剂的侵害,并抑制了脂多糖(LPS)诱导的NO过度产生。其中,化合物6.22具有在低浓度下(2.5μM)表现出强烈抗氧化活性(细胞存活率=94.5%)特点。此外,化合物6.22(IC50=1.6μM)的抗炎活性略强于基准化合物1(IC50=13.4μM)。鉴于6.22在性能上的突出表现,检测了H2O2损伤的PC12细胞的凋亡率,通过附着抑制器V-FITC/PI试剂,结果表明在低浓度(2.5μM)下,6.22的抗凋亡活性比基准化合物1更高,这与抗氧化和抗炎作用类似。此外,基于计算预测其中枢神经系统的(+)和血脑屏障(BBB)通透性(P-e=6.84×10(-6) cm s(-1)),具有较低的细胞毒性以及良好的物化性质,因此,化合物6.22可以进一步开发为一种潜在多功能神经保护剂。(C)2019 Elsevier Masson SAS. 版权所有。
Phosphaadamantanes as Ligands for Palladium Catalyzed Cross-Coupling Chemistry: Library Synthesis, Characterization, and Screening in the Suzuki Coupling of Alkyl Halides and Tosylates Containing β-Hydrogens with Boronic Acids and Alkylboranes
作者:Tim Brenstrum、David A. Gerristma、George M. Adjabeng、Christopher S. Frampton、James Britten、Alan J. Robertson、James McNulty、Alfredo Capretta
DOI:10.1021/jo048875+
日期:2004.10.1
allowed for the rapid determination of the most suitable ligand, specifically 1,3,5,7-tetramethyl-6-(2,4-dimethoxyphenyl)-2,4,8-trioxa-6-phosphaadamantane, for facilitating Suzuki-type couplings of alkylhalides or tosylates containing β-hydrogens with either boronic acids or alkylboranes.
Visible‐Light‐Induced Pyridylation of Remote C(sp
<sup>3</sup>
)−H Bonds by Radical Translocation of N‐Alkoxypyridinium Salts
作者:Inwon Kim、Bohyun Park、Gyumin Kang、Jiyun Kim、Hoimin Jung、Hyeonyeong Lee、Mu‐Hyun Baik、Sungwoo Hong
DOI:10.1002/anie.201809879
日期:2018.11.19
Metal‐free, visible‐light‐induced site‐selective heteroarylation of remote C(sp3)−H bonds has been accomplished through the design of N‐alkoxyheteroarenium salts serving as both alkoxy radical precursors and heteroaryl sources. The transient alkoxy radical can be generated by the single‐electron reduction of an N‐alkoxypyridinium substrate by a photoexcited quinolinone catalyst. Subsequent radical translocation
作者:Leo A. Paquette、Gregory J. Wells、Keith A. Horn、Tu-Hsin Yan
DOI:10.1016/s0040-4020(01)88590-2
日期:1983.1
does add satisfactorily to carbonyl compounds and the subsequent Simmons-Smith cyclopropanation provides the desired cyclopropyl carbinols, shorter routes involving the 1-trimethylsilylcyclopropyl anion were sought. The sequence based upon reductive lithiation of 1-(trimethylsilyl)-1-phenyl-thiocyclopropane proved less than satisfactory. In contrast, metalation of 1-bromo-1-(trimethylsilyl)cyclopropane
Silicon in organic syntheis. 13. The 1-trimethylsilylcyclopropyl anion and its formal equivalent
作者:Leo A Paquette、Keith A Horn、Gregory J Wells
DOI:10.1016/s0040-4039(00)86803-3
日期:1982.1
Reaction of lithio 1-trimethylsilylcyclopropane or its formal equivalent [CH2 = C(Li)SiMe3; CH2I2, EtZnI] with carbonyl compounds leads to carbinols which dehydrate without rearrangement. Other attempts to induce ring expansion of the silicon substituted three-memberedring by ionic pathways are reported.
硫代1-三甲基甲硅烷基环丙烷或其形式当量的反应[CH 2 = C(Li)SiMe 3;CH 2 I 2,[EtZnI]与羰基化合物一起生成甲醇,其脱水而没有重排。报道了通过离子途径诱导硅取代的三元环的环膨胀的其他尝试。
Suzuki Cross-Couplings of Alkyl Tosylates that Possess β Hydrogen Atoms: Synthetic and Mechanistic Studies