合成了一系列在亚胺氮上具有取代基变化的吡啶基嘧啶配体,并与[MoCl 2 O 2 ]核配位。复合物的新的分子结构进行了充分表征通过1 H和13 C NMR,FT-IR,ESI,EA,和X-射线晶体学,和它们的催化活性进行了研究,使用烯烃的环氧化叔叔丁基过氧化氢(TBHP)作为氧化剂。与类似的均相钼配合物相比,新的配合物在环氧化反应中显示出优异的催化活性和优良的选择性。结果表明,取决于吡啶吡啶亚胺配体结构上的烷基臂,催化性能有显着变化。催化结果表明,络合物[MoCl 2 O 2(L)](L:N-(2-吡啶基亚甲基)-1-叔丁基亚胺)C 5是环己烯环氧化的最佳催化前体(TON:92920和TOF :30974 h -1)。
Selective Aerobic Oxidation of Alcohols to Aldehydes, Carboxylic Acids, and Imines Catalyzed by a Ag-NHC Complex
作者:Lei Han、Ping Xing、Biao Jiang
DOI:10.1021/ol501353q
日期:2014.7.3
Silver NHC catalysts have been developed for the selective oxidation of alcohols to aldehydes or carboxylic acids in the presence of BnMe3NOH or KOH under dry air. The aerobic oxidation conditions are mild, and the yield is excellent. Further tandem catalysis enables the one-pot synthesis of imines in excellent yield. Only 0.1 mol % of the catalyst is required.
Carbon disulfide binding at dinuclear and mononuclear nickel complexes ligated by a redox-active ligand: iminopyridine serving as an accumulator of redox equivalents for the activation of heteroallenes
作者:Amarnath Bheemaraju、Jeffrey W. Beattie、Richard L. Lord、Philip D. Martin、Stanislav Groysman
DOI:10.1039/c2cc34307j
日期:——
The dinuclear complex Ni2L1(η2-CS2)2 (2), featuring iminopyridine ligation, is prepared by COD substitution from Ni2L1(COD)2 (1). Spectroscopic, structural, and theoretical data reveals significant activation of the metal-bound C–S bonds, as well as the different oxidation states of the iminopyridine in 1 (1−) and 2 (0).
Aerobic oxidative coupling of alcohols and amines towards imine formation by a dicopper(I,I) catalyst
作者:Indranil Dutta、Subhabrata De、Sudhir Yadav、Ranajit Mondol、Jitendra K. Bera
DOI:10.1016/j.jorganchem.2017.05.009
日期:2017.11
A dicopper(I,I) complex [Cu2(L1) (Cl)2] (1), bearing a Cu2Cl2 core spanned by a naphthyridine–diimine ligand is synthesized by the treatment of CuCl with 2,7–bis(N–mesitylmethylimino)–1,8–naphthyridine (L1). The catalytic efficacy of 1 is assessed for aerobic oxidative synthesis of imines from alcohols and amines. The title complex is found to be an excellent catalyst for a wide variety of alcohols
Ligand‐Tuned C–H Bond Activation/Arylation of 2‐Arylpyridines over Pyridine‐Based
<i>N</i>
,
<i>O/N</i>
,
<i>N</i>
Ligated Ruthenium–Arene Complexes
作者:Chinky Binnani、Rohit K. Rai、Deepika Tyagi、Shaikh M. Mobin、Sanjay K. Singh
DOI:10.1002/ejic.201701446
日期:2018.3.29
our investigations, including time‐dependent 1H NMRspectroscopic studies with ruthenium–arene catalysts, demonstrate a remarkable structure–activity relationship for the ligand‐tuned C–H activation/arylation of 2‐phenylpyridine, where the complexes with bischelating N,O donor‐based ligands (acteylpyridine and picolinate) outperform those with N,N donor ligands (iminopyridine). Moreover, among the N
Multicomponent Reaction of Imidazo[1,5-<i>a</i>]pyridine Carbenes with Aldehydes and Dimethyl Acetylenedicarboxylate or Allenoates: A Straightforward Approach to Fully Substituted Furans
facile three-component reactions of N,N-substituted imidazo[1,5-a]pyridine carbenes, namely imidazo[1,5-a]pyridin-3-ylidenes, with aldehydes and DMAD or allenoates were disclosed. Both reactions proceeded via tandem nucleophilic addition, [3 + 2]-cycloaddition, and ring transformation to produce different 4-[(2-pyridyl)methyl]aminofuran derivatives generally in moderate yields. This work not only provided
公开了N,N-取代的咪唑并[1,5- a ]吡啶碳烯的简单的三组分反应,即咪唑并[1,5 - a ]吡啶-3-亚胺与醛和DMAD或脲基甲酸酯的反应。这两个反应都是通过串联亲核加成,[3 + 2]-环加成和环转化进行的,通常以中等收率产生不同的4-[((2-吡啶基)甲基]氨基呋喃衍生物。这项工作不仅提供了咪唑并[1,5 - a ]吡啶-3-吡咯烷在有机合成中的应用的第一个例子,而且还开发了一种直接取代完全呋喃的简单方法,而其他方法不易获得。