Methyl Analogues of the Experimental Alzheimer Drug Phenserine: Synthesis and Structure/Activity Relationships for Acetyl- and Butyrylcholinesterase Inhibitory Action
摘要:
With the goal of developing potential Alzheimer's pharmacotherapeutics, we have synthesized a series of novel analogues of the potent anticholinesterases phenserine (2) and physostigmine (1). These derivatives contain methyl (3, 4, 6), dimethyl (5, 7, 8, 10, 11) and trimethyl (14) substituents in each position of the phenyl group of the phenylcarbamoyl moieties, and with N-methyl and 6-methyl substituents (12, 13, 31, 33). We also quantified the inhibitory action of these compounds against human acetylcholinesterase (AChE) and butyrylcholinesterase (BChE). An analysis of the structure/anticholinesterase activity relationship of the described compounds, together with molecular modeling, confirmed the catalytic triad mechanism of the binding of this class of carabamate analogues within AChE and BChE and defined structural requirements for their differential inhibition.
摘要 在室温下缓慢蒸发得到2,5-二甲基苯胺氯化物一水合物。该材料通过 DSC、X 射线粉末衍射、拉曼和阻抗光谱技术在 2.10 2 –5.10 6 Hz 频率和 292–422 K 温度范围内进行表征。量热研究揭示了 355 K、392 K 和 403 K 处的三个吸热峰,它们定义了四个连续的相,分别表示为 I、II、III 和 IV。第一个峰对应于从晶体中逸出的水。加热到 355 K 以上后,化合物脱水,晶体空间群从非中心对称变为中心对称。发现负责从模量谱中提取的介电弛豫的活化能与从相 I 和 IV 的直流电导率的温度变化获得的值几乎相同。这些结果表明传输是通过离子跳跃机制进行的。还讨论了脱水过程对化合物电导率的影响。
Preparation and Redox Properties of<i>N</i>,<i>N</i>,<i>N</i>-1,3,5-Trialkylated Flavin Derivatives and Their Activity as Redox Catalysts
作者:Auri A. Lindén、Nina Hermanns、Sascha Ott、Lars Krüger、Jan-E. Bäckvall
DOI:10.1002/chem.200400540
日期:2005.1
Eight different flavinderivatives have been synthesized and the electronic effects of substituents in various positions on the flavinredox chemistry were investigated. The redox potentials of the flavins, determined by cyclic voltammetry, correlated with their efficiency as catalysts in the H2O2 oxidation of methyl p-tolyl sulfide. Introduction of electron-withdrawing groups increased the stability
High-throughput approach for the identification of anilinium-based ionic liquids that are suitable for electropolymerisation
作者:Muhammad E. Abdelhamid、Timothy Murdoch、Tamar L. Greaves、Anthony P. O'Mullane、Graeme A. Snook
DOI:10.1039/c5cp02294k
日期:——
We report the synthesis of new protic ionic liquids (PILs) based on aniline derivatives and the use of high-throughput (HT) techniques to screen possible candidates.
To study the influence of the ring sizes, 37 novel seven-membered azabridged neonicotinoidanalogues were synthesized by reactions of nitromethylene analogues, succinaldehyde, and aniline hydrochlorides. Most of the title compounds presented higher insecticidal activities than that of imidacloprid (IMI), cycloxaprid (CYC), and eight-membered compounds against cowpea aphid (Aphis craccivora), armyworm
Olefin polymerisation catalysts and processes for producing olefin polymers
申请人:TOSOH CORPORATION
公开号:EP0849292A1
公开(公告)日:1998-06-24
Catalysts for olefin polymerization which consist essentially of a transition metal compound, a modified clay compound and an organic aluminum compound, wherein the modified clay compound comprises a reaction product of a clay mineral and a proton acid salt of a specific amine compound, as well as a method of polymerizing olefins using such catalysts. It is possible thereby to obtain olefin polymers with high productivity and low ash content.