锌反蛋白石已通过电化学沉积在氧化铟锡 (ITO) 和 n 掺杂硅衬底上生长的聚苯乙烯人造蛋白石上进行模板化制造。在通过线性循环伏安法和方波脉动电位方法填充的样品之间观察到几种渗透差异,导致在半导体衬底上制造具有不同拓扑结构的金属光子晶体。样品已通过扫描电子显微镜 (SEM)、能量色散 X 射线分析 (EDX) 和 X 射线粉末衍射进行了表征。这是第一次制造锌反蛋白石,这项工作证明了通过电化学方法在不同的半导体衬底上生长大孔结构的可能性。
Are Terminal Alkynes Necessary for MAO-A/MAO-B Inhibition? A New Scaffold Is Revealed
摘要:
A versatile family of quaternary propargylamines was synthesized employing the KA2 multicomponent reaction, through the single-step coupling of a number of amines, ketones, and terminal alkynes. Sustainable synthetic procedures using transition metal catalysts were employed in all cases. The inhibitory activity of these molecules was evaluated against human monoaminoxidase (hMAO)-A and hMAO-B enzymes and was found to be significant. The IC50 values for hMAO-B range from 152.1 to 164.7 nM while the IC50 values for hMAO-A range from 765.6 to 861.6 nM. Furthermore, these compounds comply with Lipinski’s rule of five and exhibit no predicted toxicity. To understand their binding properties with the two target enzymes, key interactions were studied using molecular docking, all-atom molecular dynamics (MD) simulations, and MM/GBSA binding free energy calculations. Overall, herein, the reported family of propargylamines exhibits promise as potential treatments for neurodegenerative disorders, such as Parkinson’s disease. Interestingly, this is the first time a propargylamine scaffold bearing an internal alkyne has been reported to show activity against monoaminoxidases.
Oxidative Release of Copper from Pharmacologic Copper Bis(thiosemicarbazonato) Compounds
作者:John J. Sirois、Lillian Padgitt-Cobb、Marissa A. Gallegos、Joseph S. Beckman、Christopher M. Beaudry、James K. Hurst
DOI:10.1021/acs.inorgchem.8b00853
日期:2018.8.6
2-Pyridylazoresorcinol complexation was used to demonstrate that Cu(II) release by reaction with peroxynitrite species involved rate-limiting homolysis of the peroxy O–O bond to generate secondary oxidizing radicals (NO2•, •OH, and CO3•–). Because the potentials for CuII(btsc) oxidation and reduction are ligand-dependent, varying by as much as 200 mV, it is clearly advantageous in designing therapeutic methodologies
从铜-双-硫代嘧啶铜氮杂铜络合物向细胞内递送治疗性或分析性铜的机制通常涉及内源性还原剂将单电子还原为Cu(I)类似物的机制,从而使金属离子不稳定且与bis--不牢固地配位。硫半脲(bTSc)配体。但是,本文所述的电化学和光谱研究表明,Cu II(bTSc)和Zn II ATSM(bTSc =二乙酰基-双(4-甲基硫代半碳氮杂))复合物的单电子氧化在生理氧化剂范围内发生,导致还存在未被认可的铜释放的氧化途径。H 2 O 2氧化Cu II(bTSc)由髓过氧化物酶或辣根过氧化物酶,HOCl和牛磺酸氯胺(它们主要是由MPO催化反应在活化的中性粒细胞中产生的氯化剂)以及过氧化亚硝酸盐类(ONOOH,ONOOCO 2 –)催化的被证明。与还原不同,氧化反应通过不可逆的配体氧化进行,最终释放出Cu(II)。2-吡啶基偶氮间苯二酚络合物用于证明通过与过氧亚硝酸盐类物质反应释放Cu(II)涉及限速过氧O-
DBU-catalyzed condensation of metal free and metallophthalocyanines containing thiazole and azine moieties: Synthesis, characterization and electrochemical properties
作者:Gökhan Dede、Rıza Bayrak、Mustafa Er、Ali Rıza Özkaya、İsmail Değirmencioğlu
DOI:10.1016/j.jorganchem.2013.04.043
日期:2013.9
Schiffbase that contains carbothioamide moiety, substituted thiazole derivative, novel phthalonitrile compound and its corresponding metal free and metal phthalocyanines (Zn(II), Ni(II), Co(II) and Cu(II)) were synthesized and characterized for the first time. The solubility of these novel phthalocyanines were high in organic solvents and they did not aggregate in chloroform within the concentration
Radical-Trapping Antioxidant Activity of Copper and Nickel Bis(Thiosemicarbazone) Complexes Underlies Their Potency as Inhibitors of Ferroptotic Cell Death
作者:Omkar Zilka、Jia-Fei Poon、Derek A. Pratt
DOI:10.1021/jacs.1c08254
日期:2021.11.17
inhibitor of (phospho)lipid peroxidation. In THF autoxidations, CuATSM reacts with THF-derived peroxyl radicals with kinh = 2.2 × 106 M–1 s–1─roughly 10-fold greater than α-tocopherol (α-TOH), Nature’s best RTA. Mechanistic studies reveal no H/D kinetic isotope effects and a lack of rate-suppressing effects from H-bonding interactions, implying a different mechanism from α-TOH and other canonical RTAs, which
在此我们证明了铜 (II)-二乙酰-双 ( N 4 -甲基氨基硫脲) (CuATSM) 是治疗 ALS 和帕金森病的临床候选药物,是一种高效的自由基捕获抗氧化剂 (RTA) 和 (phospho) 的抑制剂脂质过氧化。在 THF 自动氧化中,CuATSM 与 THF 衍生的过氧自由基反应,k inh = 2.2 × 10 6 M –1 s –1─大约是自然界最好的 RTA α-生育酚 (α-TOH) 的 10 倍。机理研究表明,没有 H/D 动力学同位素效应,并且缺乏 H 键相互作用的速率抑制效应,这意味着与 α-TOH 和其他典型 RTA 的机制不同,后者通过 H 原子转移 (HAT) 反应。对于相应的 Ni 2+络合物和 Cu 2+和 Ni 2+的络合物,观察到类似的反应性与其他双(氨基硫脲)配体。计算证实了限速 HAT 不能解释观察到的 RTA 活性的实验发现,而是表明可逆地向双(氨
The exocyclic functionalisation of bis(thiosemicarbazonate) complexes of zinc and copper: the synthesis of monomeric and dimeric species
作者:Martin Christlieb、Harriet S. R. Struthers、Paul D. Bonnitcha、Andrew R. Cowley、Jonathan R. Dilworth
DOI:10.1039/b705087a
日期:——
exocylic imine groups bearing a range of substituents. The zinc complexes can be quantitatively and rapidly transmetallated to the corresponding copper complexes and this route or direct reaction with the free ligand can be used to radiolabel the monomericspecies with (64)Cu. In vivo and in vitro studies of one of the (64)Cu imine complexes shows substantial hypoxic selectivity and high tumour uptake in
these results the optimal porphyrins can be selected for the desired binding interactions. We also show how to use DFT calculations to evaluate the potential binding between a metalloporphyrin and a ligand, which is deduced from free energies of binding ΔG, charge transfer ΔQ, and change of metal spin state. Computations on unsubstituted porphyrins in lieu of tetraphenyl porphyrin systems yield reliable