aerobic oxidative dehydrogenation of N-heterocycles were examined in detail. Many tetrahydroquinoline derivatives and a broad range of other N-heterocycles could be tolerated by the catalytic system using a biomass-derived solvent as a reaction medium. Newly generated mixed crystal phases, noticeably enhanced surface areas and labile lattice oxygen of the OMS-2-based nanocomposite catalysts might contribute
Amorphous manganese oxide doped by Na+ ion (Na-AMO) was successfully prepared and found to be an efficient heterogeneous catalyst in aerobicoxidative dehydrogenation of N-heterocycles, cooperate with catachol. Na-AMO was fully characterized by XRD, XPS BET H2-TPR, CO2-TPD FT-IR, TEM, SEM and had rich amounts of surface absorbed active oxygen species which are responsible for superior catalytic performance
成功制备了Na +离子掺杂的无定形锰氧化物(Na-AMO),发现它是N-杂环好氧氧化脱氢的有效多相催化剂,与催化裂化反应配合使用。Na-AMO通过XRD,XPS BET H 2 -TPR,CO 2 -TPD FT-IR,TEM,SEM进行了全面表征,并具有大量的表面吸收活性氧,这些都具有优异的催化性能。Na-AMO和邻苯二酚之间的协同相互作用使催化系统高效且具有耐受性,在温和条件下,该系统可提供各种N-杂环化合物,收率好至极佳。
Development of a metal-free amine oxidation method utilizing DEAD chemistry
作者:G. Wang、G. Piva de Silva、N. E. Wiebe、G. M. Fehr、R. L. Davis
DOI:10.1039/c7ra09165f
日期:——
Herein, we examine the oxidative abilities of azodicarboxylates for the conversion of amines to imines. This method provides access to synthetically useful imine intermediates including β-carbolines, quinazolines and N-heterocyclic carbene precursors. The ability to recover spent azodicarboxylate for regeneration and further use underscores the applicability and appeal of this protocol.
Bioinspired Aerobic Oxidation of Secondary Amines and Nitrogen Heterocycles with a Bifunctional Quinone Catalyst
作者:Alison E. Wendlandt、Shannon S. Stahl
DOI:10.1021/ja411692v
日期:2014.1.8
Copper amine oxidases are a family of enzymes with quinone cofactors that oxidize primary amines to aldehydes. The native mechanism proceeds via an iminoquinone intermediate that promotes high selectivity for reactions with primary amines, thereby constraining the scope of potential biomimetic synthetic applications. Here we report a novel bioinspired quinone catalyst system consisting of 1,10-phenanthroline-5,6-dione/ZnI2 that bypasses these constraints via an abiological pathway involving a hemiaminal intermediate. Efficient aerobic dehydrogenation of non-native secondary amine substrates, including pharmaceutically relevant nitrogen heterocycles, is demonstrated. The ZnI2 cocatalyst activates the quinone toward amine oxidation and provides a source of iodide, which plays an important redox-mediator role to promote aerobic catalytic turnover. These findings provide a valuable foundation for broader development of aerobic oxidation reactions employing quinone-based catalysts.
NOVEL COMPOUNDS AND THEIR USE AS POSITIVE AMPA RECEPTOR MODULATORS