Aldehydes and ketones were reductively aminated by a one‐pot procedure using a recyclable iron‐based Lewis catalyst, Aquivion‐Fe, to promote imine formation, and NaBH4 as reductant in cyclopentyl methyl ether and methanol. The developed protocol was successfully applied to the preparation of Cinacalcet, an important active pharmaceutical ingredient.
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
Copper-Catalyzed Alkylation of Aliphatic Amines Induced by Visible Light
作者:Carson D. Matier、Jonas Schwaben、Jonas C. Peters、Gregory C. Fu
DOI:10.1021/jacs.7b09582
日期:2017.12.13
the alkylation of an amine by an alkyl halide serves as a "textbook example" of a nucleophilic substitution reaction, the selective mono-alkylation of aliphatic amines by unactivated, hindered halides persists as a largely unsolved challenge in organic synthesis. We report herein that primary aliphatic amines can be cleanly mono-alkylated by unactivated secondary alkyl iodides in the presence of visible
尽管烷基卤化物对胺的烷基化作为亲核取代反应的“教科书示例”,但未活化的受阻卤化物对脂肪族胺的选择性单烷基化仍然是有机合成中主要未解决的挑战。我们在本文中报道,在可见光和铜催化剂的存在下,伯脂肪胺可以被未活化的仲烷基碘完全单烷基化。该方法在温和条件 (-10 °C) 下运行,显示出良好的官能团兼容性,并使用市售催化剂组分。使用 TEMPO 进行的捕获实验与在笼外过程中通过烷基自由基形成 CN 键是一致的。
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。
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