A Proton-Responsive Annulated Mesoionic Carbene (MIC) Scaffold on Ir Complex for Proton/Hydride Shuttle: An Experimental and Computational Investigation on Reductive Amination of Aldehyde
作者:Pragati Pandey、Prosenjit Daw、Noor U Din Reshi、Kira R. Ehmann、Markus Hölscher、Walter Leitner、Jitendra K. Bera
DOI:10.1021/acs.organomet.0c00568
日期:2020.11.9
A Cp*Ir(III) complex (1) bearing a proton-responsive hydroxy unit on an annulated imidazo[1,2-a][1,8]naphthyridine based mesoionic carbene scaffold was synthesized by two different syntheticroutes. The molecular structure of 1 revealed an anionic lactam form of the ligand. The acid–base equilibrium between the lactam-lactim tautomers on the ligand scaffold was examined by 1H NMR and UV–vis spectra
通过两种不同的合成途径合成了在环状咪唑并[1,2- a ] [1,8]萘吡啶基介电卡宾骨架上带有质子响应性羟基单元的Cp * Ir(III)配合物(1)。的分子结构1揭示了配体的阴离子内酰胺形式。通过1 H NMR和UV-vis光谱检查了配体支架上内酰胺-内酯互变异构体之间的酸碱平衡。估算内酰胺形式为1的附件-OH基团的p K a,以评估催化剂的质子转移性能。1的催化功效通过使用三种不同的氢源(分子H 2,i PrOH / KO t Bu组合和HCOOH / Et 3 N(5:2)共沸混合物)评估醛的还原胺化反应。发现在三种不同的氢化方法中,HCOOH / Et 3 N(5:2)共沸混合物是最好的。在反应条件下,催化剂1在羰基上化学选择性地氢化亚胺。使用HCOOH / Et 3 N(5:2)共沸混合物将一系列醛还原为相应的仲胺。此外,催化剂1在还原多种N-杂环亚胺衍生物方面显示出高效率。提
Intramolecular cascade rearrangements of enynamine derived ketenimines: access to acyclic and cyclic amidines
作者:Dinesh Pratapsinh Chauhan、Sreejith J. Varma、Mahesh Gudem、Nihar Panigrahi、Khushboo Singh、Anirban Hazra、Pinaki Talukdar
DOI:10.1039/c7ob00499k
日期:——
acyclic and cyclicamidines. Nucleophilic addition of the tethered amino group on the in situ generated ketenimine forms a six-membered cyclic zwitterionic intermediate which facilitates migration of the tethered amino group to the C5-center giving the acyclic amidine. On the other hand, migration of a substituent on the amino group to C2- and C4-centers results in the formation of cyclicamidines. Computational
Electrochemical, Iodine-Mediated α-CH Amination of Ketones by Umpolung of Silyl Enol Ethers
作者:Julia Strehl、Gerhard Hilt
DOI:10.1021/acs.orglett.0c02068
日期:2020.8.7
oxidative Umpolung reaction of silyl enol ethers utilizing simple iodide salts for the synthesis of α-amino ketones is described. The products were isolated in excellent yields of up to 100%, and various functionalized starting materials were accepted in an undivided electrochemical cell design. Moreover, a sensitivity assessment to ensure an improved reproducibility of the reaction and cyclic voltammetry
Oxidation of Amines and Sulfides Catalyzed by an Assembled Complex of Phosphotungstate and Non-Cross-Linked Amphiphilic Polymer
作者:Shiro Ikegami、Yoichi M. Yamada、Hidetsugu Tabata、Hideyo Takahashi
DOI:10.1055/s-2002-35596
日期:——
Oxidation of sulfides and amines was performed with an assembled catalyst of phosphotungstate and non-cross-linked amphiphilic polymer. The reactions proceeded with hydrogen peroxide under organic solvent-free conditions. This insoluble catalyst was reused five times with the turnover number up to 500.
Fibrin-stabilizing factor inhibitors. 12. 5-Dibenzylaminopentylamine and related compounds, a new type of FSF [fibrin-stabilizing factor] inhibitors
作者:Kurt Juergen Hoffmann、Pal Stenberg、Christine Ljunggren、Uno Svensson、J. Lars G. Nilsson、Olle Eriksson、Ann Hartkoorn、Ragnar Lunden
DOI:10.1021/jm00237a014
日期:1975.3
A series of omegadibenzylaminoalkylamines and related compounds have been prepared and tested as inhibitors of fibrin cross-linking. This structural type was chosen in an attempt to develop noncompetitive inhibitors of fibrinoligase. By the combination of the dibenzylamino moiety at one end and the primary amino group at the other end of a polymethylene chain, the same compound could function both