Ir<sup>III</sup>-Catalyzed direct syntheses of amides and esters using nitriles as acid equivalents: a photochemical pathway
作者:Ranadeep Talukdar
DOI:10.1039/d0nj00002g
日期:——
unprecedented IrIII[df(CF3)ppy]2(dtbbpy)PF6-catalyzed simple photochemical process for direct addition of amines and alcohols to the relatively less reactive nitrile triple bond is described herein. Various amides and esters are synthesized as the reaction products, with nitriles being the acid equivalents. A mini-library of different types of amides and esters is made using this mild and efficient process, which
本文描述了空前的Ir III [df(CF 3)ppy] 2(dtbbpy)PF 6催化的简单光化学过程,用于将胺和醇直接加成到反应性较小的腈三键上。合成了各种酰胺和酯作为反应产物,其中腈是酸的当量。使用这种温和有效的方法可以制得不同类型的酰胺和酯的小型文库,该方法在可见光照射下(λ = 445 nm)仅使用1 mol%的光催化剂。该反应策略对于克级合成也是有效的。
Frustrated Lewis Pair Catalyzed Hydrogenation of Amides: Halides as Active Lewis Base in the Metal-Free Hydrogen Activation
作者:Nikolai A. Sitte、Markus Bursch、Stefan Grimme、Jan Paradies
DOI:10.1021/jacs.8b12997
日期:2019.1.9
reductant is introduced. The reaction proceeds via the hydrogen splitting by B(2,6-F2-C6H3)3 in combination with chloride as the Lewisbase. Density functional theory calculations support the unprecedented role of halides as active Lewisbase components in the frustratedLewispair mediated hydrogen activation. The reaction displays broad substrate scope for tertiary benzoic acid amides and α-branched carboxamides
Deconstructing Noncovalent Kelch-like ECH-Associated Protein 1 (Keap1) Inhibitors into Fragments to Reconstruct New Potent Compounds
作者:Jakob S. Pallesen、Dilip Narayanan、Kim T. Tran、Sara M. Ø. Solbak、Giuseppe Marseglia、Louis M. E. Sørensen、Lars J. Høj、Federico Munafò、Rosa M. C. Carmona、Anthony D. Garcia、Haritha L. Desu、Roberta Brambilla、Tommy N. Johansen、Grzegorz M. Popowicz、Michael Sattler、Michael Gajhede、Anders Bach
DOI:10.1021/acs.jmedchem.0c02094
日期:2021.4.22
Keap1–Nrf2 PPI inhibitors were dissected into 77 fragments in a fragment-based deconstruction reconstruction (FBDR) study and tested in four orthogonal assays. This gave 17 fragment hits of which six were shown by X-raycrystallography to bind in the Keap1 Kelch binding pocket. Two hits were merged into compound 8 with a 220–380-fold stronger affinity (Ki = 16 μM) relative to the parent fragments. Systematic
靶向核因子类红细胞2相关因子2(Nrf2)和与Kelch样ECH相关蛋白1(Keap1)之间的蛋白相互作用是控制涉及氧化应激疾病的潜在治疗策略。在这里,在基于片段的解构重建(FBDR)研究中,将六类已知的小分子Keap1-Nrf2 PPI抑制剂分解为77个片段,并在四个正交试验中进行了测试。这给出了17个片段命中,其中X射线晶体学显示其中6个在Keap1 Kelch结合袋中结合。相对于亲本片段,两个命中片段以220-380倍的亲和力(K i = 16μM)被合并到化合物8中。系统优化产生了一些与K i有关的新颖类似物值0.04–0.5μM,通过X射线晶体学测定的结合模式,以及增强的微粒体稳定性。这证明了FBDR如何可用于发现新的片段片段,阐明重要的配体-蛋白质相互作用以及鉴定Keap1-Nrf2 PPI的新有效抑制剂。
Mild Hydrogenation of Amides to Amines over a Platinum-Vanadium Bimetallic Catalyst
room temperature was achieved using the bimetallic catalyst. The mild reaction conditions enable highly selective hydrogenation of various amides to the corresponding amines, while inhibiting arene hydrogenation. Catalyst characterization showed that the origin of the catalytic activity for the bimetallic catalyst is the oxophilic V-decorated Pt nanoparticles, which are 2 nm in diameter.
酰胺加氢成胺是重要的反应,但是需要高温和H 2压力是一个问题。在温和的反应条件下(低于30 bar H 2和70°C)有效的催化剂尚未见报道。在此,通过使用Pt-V双金属催化剂首次实现了酰胺的温和氢化。酰胺氢化,在70°C下1 bar H 2或5 bar H 2下使用双金属催化剂达到室温。温和的反应条件能够在抑制芳烃氢化的同时,将各种酰胺高度选择性地氢化为相应的胺。催化剂表征表明,双金属催化剂催化活性的起源是亲氧性的V-修饰的Pt纳米颗粒,其直径为2 nm。
Mild and Low-Pressure<i>fac</i>-Ir(ppy)<sub>3</sub>-Mediated Radical Aminocarbonylation of Unactivated Alkyl Iodides through Visible-Light Photoredox Catalysis
作者:Shiao Y. Chow、Marc Y. Stevens、Linda Åkerbladh、Sara Bergman、Luke R. Odell
DOI:10.1002/chem.201601694
日期:2016.6.27
unactivated alkyl iodides employing a fac‐Ir(ppy)3‐catalyzed radical aminocarbonylation protocol has been developed. Using a two‐chambered system, alkyl iodides, fac‐Ir(ppy)3, amines, reductants, and CO gas (released ex situ from Mo(CO)6), were combined and subjected to an initial radical reductive dehalogenation generating alkyl radicals, and a subsequent aminocarbonylation with amines affording a