Defining the structure-activity relationship for a novel class of allosteric MKP5 inhibitors
作者:Zachary T.K. Gannam、Haya Jamali、Oh Sang Kweon、James Herrington、Shanelle R. Shillingford、Christina Papini、Erik Gentzel、Elias Lolis、Anton M. Bennett、Jonathan A. Ellman、Karen S. Anderson
DOI:10.1016/j.ejmech.2022.114712
日期:2022.12
Mitogen-activated protein kinase (MAPK) phosphatase 5 (MKP5) is responsible for regulating the activity of the stress-responsive MAPKs and has been put forth as a potential therapeutic target for a number of diseases, including dystrophic muscle disease a fatal rare disease which has neither a treatment nor cure. In previous work, we identified Compound 1 (3,3-dimethyl-1-((9-(methylthio)-5,6-dihydrothieno[3
Syntheses of ester and amide derivatives of calix[6]arene and their complexation affinities towards La<sup>3+</sup>, Eu<sup>3+</sup>, and Yb<sup>3+</sup>
lanthanide cations (La3+, Eu3+, Yb3+) were studied by spectroscopic and massspectrometric techniques. No complexation was observed with the ester derivative, while compounds 2–4 formed 1:1 complexes. Based on spectrophotometric titrations, the stability constants of resulting complexes could only be estimated (lg K ≥ 6). Calixarene derivatives, as well as their complexes, were analysed by ESI MS and MS/MS
摘要 在微波辐射下,首次在一个合成步骤中制备了杯[6]芳烃的一种六酯 (1) 和三种六酰胺衍生物 (2-4)。化合物2和3是新的化合物,而酯杯[6]芳烃衍生物1和酰胺衍生物4是先前通过常规合成制备的。微波辅助合成将反应时间从 48 小时缩短到 2 小时。通过光谱和质谱技术研究了杯[6]芳烃对选定镧系元素阳离子(La3+、Eu3+、Yb3+)的结合特性。没有观察到与酯衍生物的络合,而化合物 2-4 形成了 1:1 的络合物。基于分光光度法滴定,所得配合物的稳定性常数只能估计(lg K ≥ 6)。杯芳烃衍生物,以及它们的配合物,通过 ESI MS 和 MS/MS 光谱分析。提出了相应的碎裂途径,并且在某些情况下由 MS3 实验证实。不同技术得到的结果是一致的。图形概要
Effect of carbonyl substituents on the barrier to rotation inN-ethyl-N-methylamides
作者:Helio G. Bonacorso、Miguel S. B. Caro、Nilo Zanatta、Marcos A. P. Martins
DOI:10.1002/mrc.1260310507
日期:1993.5
The barriers to rotation about the C(O)N bond for 13 α‐alkyl‐ and α‐halo‐substituted N‐theyl‐N‐methylamides were determined by 1H NMR spectroscopy at coalescence temperature. Plots of Gibbs free energy (ΔG°) and Gibbs energy of activation (ΔG‡) values against Charton's electronic and steric parameters of the α‐carbonyl groups allows the conclusion that both the isomeric preference and the barrier to