钾叔N-杂环的丁醇促进的acceptorless脱氢高效地实现用于N-杂芳烃和氢气的过渡金属-自由条件下产生。在存在KO t Bu碱的情况下,各种六元和五元N-杂环化合物可以有效地进行无受体脱氢,从而在140°C的邻二甲苯中提供相应的N-杂芳烃和H 2气体。本协议提供了一条通往芳香族含氮化合物和H 2气体的便捷途径。
and stable core-shell catalysts. In this respect, we present the synthesis and characterization of iron oxides surrounded by nitrogen-doped-graphene shells immobilized on carbon support (labeled FeOx@NGr-C). Active catalytic materials are obtained in a simple, scalable and two-step method via pyrolysis of iron acetate and phenanthroline and subsequent selective leaching. The optimized FeOx@NGr-C catalyst
B(C<sub>6</sub>
F<sub>5</sub>
)<sub>3</sub>
-Catalyzed Cascade Reduction of Pyridines
作者:Zhi-Yun Liu、Zhi-Hui Wen、Xiao-Chen Wang
DOI:10.1002/anie.201702304
日期:2017.5.15
development hinges upon the realization of a cascade process of dearomative hydrosilylation (or hydroboration) and transfer hydrogenation. The broad functional‐group tolerance (e.g. ketone, ester, unactivated olefins, nitro, nitrile, heterocycles, etc.) implies high practical utility.
已发现B(C 6 F 5)3是一种有效的催化剂,可以用氢化硅烷(或氢硼烷)和胺作为还原剂还原吡啶和其他电子不足的N-杂芳烃。该开发的成功取决于脱芳香氢化硅烷化(或硼氢化)和转移氢化的级联过程的实现。宽泛的官能团耐受性(例如酮,酯,未活化的烯烃,硝基,腈,杂环等)暗示着很高的实用性。
Experimental and computational studies of borohydride catalyzed hydrosilylation of a variety of CO and CN functionalities including esters, amides and heteroarenes
作者:Michael G. Manas、Liam S. Sharninghausen、David Balcells、Robert H. Crabtree
DOI:10.1039/c3nj01485a
日期:——
Sodium borohydride and a series of related borohydrides catalyze a transition metal-free hydrosilylation of a variety of CO and CN functionalities under mild conditions. Importantly, many of these reactions are possible using the cheap and environmentally benign hydrosilane polymethylhydrosiloxane. A mechanism is proposed based on experimental and computational results.
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
Cu-catalyzed reduction of azaarenes and nitroaromatics with diboronic acid as reductant
copper-catalyzed reduction of azaarenes with diboronicacid as reductant in an aprotic solvent under mild conditions has been developed. Most interestingly, the nitroazaarenes could be reduced exclusively to give the corresponding amines without touching the azaarene moieties. Furthermore, the reductive amination of aromatic nitro compounds and aromatic aldehydes has also been realized. A series of