Ruthenium-Catalyzed <i>N</i>-Alkylation of Amines with Alcohols under Mild Conditions Using the Borrowing Hydrogen Methodology
作者:Arrey B. Enyong、Bahram Moasser
DOI:10.1021/jo501273t
日期:2014.8.15
Using a simple amino amide ligand, ruthenium-catalyzed one-pot alkylation of primary and secondary amines with simple alcohols was carried out under a wide range of conditions. Using the alcohol as solvent, alkylation was achieved under mild conditions, even as low as room temperature. Reactions occurred with high conversion and selectivity in many cases. Reactions can also be carried out at high temperatures
Recyclable cobalt(0) nanoparticle catalysts for hydrogenations
作者:Philipp Büschelberger、Efrain Reyes-Rodriguez、Christian Schöttle、Jens Treptow、Claus Feldmann、Axel Jacobi von Wangelin、Robert Wolf
DOI:10.1039/c8cy00595h
日期:——
The search for new hydrogenationcatalysts that replace noble metals is largely driven by sustainability concerns and the distinct mechanistic features of 3d transition metals. Several combinations of cobalt precursors and specific ligands in the presence of reductants or under high-thermal conditions were reported to provide activehydrogenationcatalysts. This study reports a new method of preparation
寻找替代贵金属的新型加氢催化剂的主要原因是对可持续性的关注以及3d过渡金属的独特机械特性。据报道,在还原剂存在下或在高温条件下,钴前体和特定配体的几种组合可提供活性加氢催化剂。这项研究报告了一种在不存在配体或表面活性剂的情况下通过还原商业CoCl 2制备小的单分散Co(0)纳米颗粒(3-4 nm)的新方法。在烯烃,炔烃,亚胺和杂芳烃(2–20 bar H 2)的氢化中观察到高催化活性。磁性使催化剂分离和多次回收成为可能。
Hydrogen‐Bond Catalysis of Imine Exchange in Dynamic Covalent Systems
of dynamiccovalent chemistry, with applications such as preparation of functional systems, dynamic materials, molecular machines, and covalent organic frameworks. However, acid catalysis is commonly needed for efficient equilibration of imine mixtures. Herein, it is demonstrated that hydrogen bond donors such as thioureas and squaramides can catalyze the equilibration of dynamic imine systems under
Synthesis and Cytotoxicity of Octahydroepoxyisoindole‐7‐carboxylic Acids and Norcantharidin–Amide Hybrids as Norcantharidin Analogues
作者:Lacey Hizartzidis、Jayne Gilbert、Christopher P. Gordon、Jennette A. Sakoff、Adam McCluskey
DOI:10.1002/cmdc.201900180
日期:2019.6.18
Octahydroepoxyisoindole analogues of norcantharidin were accessed through a Diels-Alder reaction of an amine-substituted furan with maleic anhydride and subsequent reduction of the bicyclo[2.2.1]hepteneolefin. Despite retention of the carboxylate and the ether bridgehead known to impart cytotoxic activity to norcantharidin, none of these analogues displayed notable cytotoxicity against the 11 cell
Nucleophilic Trifluoromethylation of Imines under Acidic Conditions
作者:Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1002/ejoc.200800820
日期:2008.11
A general method for the trifluoromethylation of imines by using Me3SiCF3 under acidic conditions is described. The reaction is promoted by hydrofluoric acid generated in situ from KHF2 and either TFA or TfOH. A new chemoselectivity pattern was achieved, as the C=N bond was found to be more reactivate than the carbonyl group. The trifluoromethylation reaction is believed to proceed by concerted transfer