在固体支持物上超分子系统的受控和完整组装是一个挑战,它将提高互锁体系结构的功能。在其他动态共价合成方法成功的基础上,我们提出了exchange交换作为改善溶液中和固体表面上轮烷形成的策略。最初准备了含有萘二酰亚胺(NDI)或联吡啶基序和1,5-二萘并[38] crown-10的溶液状态类似物,以建立理想条件,以维持整个交换反应的热平衡。在酰肼官能化的TentaGel™聚合物树脂上合成固态轮烷,并用HR MAS 1分析1 H NMR光谱。NDI轮烷的表面轮烷官能度达到80%,这明显高于以前报道的动态共价或传统不可逆合成策略。
Lead identification of acetylcholinesterase inhibitors–histamine H3 receptor antagonists from molecular modeling
作者:Scott D. Bembenek、John M. Keith、Michael A. Letavic、Richard Apodaca、Ann J. Barbier、Lisa Dvorak、Leah Aluisio、Kirsten L. Miller、Timothy W. Lovenberg、Nicholas I. Carruthers
DOI:10.1016/j.bmc.2007.12.048
日期:2008.3.15
histamine H(3) receptor antagonist. Both histamine H(3) receptor antagonists and AChE inhibitors improve and augment cholinergic neurotransmission in the cortex. However, whereas an AChE inhibitor will impart its effect everywhere, a histamine H(3) antagonist will raise acetylcholine levels mostly in the brain as its mode of action will primarily be on the centralnervoussystem. Therefore, the combination
Target Guided Synthesis of 5-Benzyl-2,4-diamonopyrimidines: Their Antimalarial Activities and Binding Affinities to Wild Type and Mutant Dihydrofolate Reductases from <i>Plasmodium falciparum</i>
The resistance to pyrimethamine (PYR) of Plasmodium falciparum arising from mutation at position 108 of dihydrofolate reductase (pfDHFR) from serine to asparagine (S108N) is due to steric interaction between the bulky side chain of N108 and Cl atom of the 5-p-Cl aryl group of PYR, which consequently resulted in the reduction in binding affinity between the enzyme and inhibitor. Molecular modeling suggested that the flexible antifolate, such as trimethoprim (TMP) derivatives, could avoid this steric constraint and should be considered as new, potentially effective compounds. The hydrophobic interaction between the side chain of inhibitor and the active site of the enzyme around position 108 was enhanced by the introduction of a longer and more hydrophobic side chain on TMP's 5-benzyl moiety. The prepared compounds, especially those bearing aromatic substituents, exhibited better binding affinities to both wild type and mutant enzymes than the parent compound. Binding affinities of these compounds correlated well with their antimalarial. activities against both wild type and resistant parasites. Molecular modeling of the binding of such compounds with pfDHFR also supported the experimental data and clearly showed that aromatic substituents play an important role in enhancing binding affinity. In addition, some compounds with 6-alkyl substituents showed relatively less decrease in binding constants with the mutant enzymes and relatively good antimalarial. activities against the parasites bearing the mutant enzymes.
Controlled Reduction of Nitriles by Sodium Hydride and Zinc Chloride
作者:Shunsuke Chiba、Derek Yiren Ong
DOI:10.1055/s-0039-1690838
日期:2020.5
new protocol for the controlled reduction of nitriles to aldehydes was developed using a combination of sodium hydride and zinc chloride. The iminyl zinc intermediatesderivedfrom aromatic nitriles could be further functionalized with allylmetal nucleophiles to afford homoallylamines. As the method allows the reduction of various aliphatic and aromatic nitriles with a concise procedure under milder
Hydrazone exchange: a viable route for the solid-tethered synthesis of [2]rotaxanes
作者:Rafael Da Silva Rodrigues、Ena T. Luis、David L. Marshall、John C. McMurtrie、Kathleen M. Mullen
DOI:10.1039/d1nj00388g
日期:——
of supramolecular systems on solid supports is a challenge that would elevate the function of interlockedarchitectures. Building on the success of other dynamiccovalent synthetic methods, we present hydrazone exchange as a strategy to improve the formation of rotaxanes in solution and on solid surfaces. Solution-state analogues containing naphthalenediimide (NDI) or bipyridinium motifs and 1,5-d
在固体支持物上超分子系统的受控和完整组装是一个挑战,它将提高互锁体系结构的功能。在其他动态共价合成方法成功的基础上,我们提出了exchange交换作为改善溶液中和固体表面上轮烷形成的策略。最初准备了含有萘二酰亚胺(NDI)或联吡啶基序和1,5-二萘并[38] crown-10的溶液状态类似物,以建立理想条件,以维持整个交换反应的热平衡。在酰肼官能化的TentaGel™聚合物树脂上合成固态轮烷,并用HR MAS 1分析1 H NMR光谱。NDI轮烷的表面轮烷官能度达到80%,这明显高于以前报道的动态共价或传统不可逆合成策略。