Manganese Catalyzed Direct Amidation of Esters with Amines
作者:Zhengqiang Fu、Xinghua Wang、Sheng Tao、Qingqing Bu、Donghui Wei、Ning Liu
DOI:10.1021/acs.joc.0c02478
日期:2021.2.5
metal catalyzed amidations remains a challenge. Here, a manganese(I)-catalyzed method for the direct synthesis of amides from a various number of esters and amines is reported with unprecedented substrate scope using a low catalyst loading. A wide range of aromatic, aliphatic, and heterocyclic esters, even in fattyacid esters, reacted with a diverse range of primary aryl amines, primary alkyl amines
Long‐Lived Circularly Polarized Phosphorescence in Helicene‐NHC Rhenium(I) Complexes: The Influence of Helicene, Halogen, and Stereochemistry on Emission Properties
作者:Etienne S. Gauthier、Laura Abella、Nora Hellou、Benoît Darquié、Elsa Caytan、Thierry Roisnel、Nicolas Vanthuyne、Ludovic Favereau、Monika Srebro‐Hooper、J. A. Gareth Williams、Jochen Autschbach、Jeanne Crassous
DOI:10.1002/anie.202002387
日期:2020.5.25
strongly enhanced phosphorescencelifetimes (reaching 0.7 ms) and increased circularly polarized emission (CPL) activity, as compared to their parent chiral models lacking the helicene unit. The halogen along with its position within the dissymmetric stereochemical environment strongly affect the photophysics of the complexes, particularly the phosphorescence quantum yield and lifetime. These results
Rhenium and Technetium Tricarbonyl Complexes of N-Heterocyclic Carbene Ligands
作者:Chung Ying Chan、Paul A. Pellegrini、Ivan Greguric、Peter J. Barnard
DOI:10.1021/ic500917s
日期:2014.10.20
and Ag2O in methanol, followed by the addition of fac-[99mTc(OH2)3(CO)3]+. To confirm the structure of the 99mTc-labeled complex, the equivalent 99Tc complex was prepared, and mass spectrometric studies showed that the formed Tc complexes are of the form [99m/99Tc(CH3CN)(CO)3(1-(2-pyridyl)-3-methylimidazolylidene)]+ with an acetonitrile molecule coordinated to the metal center.
描述了一种通过酰胺键形成将N-杂环卡宾(NHC)配体缀合到生物分子上的策略。制备了用侧羧酸基官能化的1-(2-吡啶基)咪唑鎓盐或1-(2-吡啶基)苯并咪唑鎓盐,并使用1-乙基-3-(3-(二甲基氨基)丙基)碳二亚胺与甘氨酸苄基酯偶联。 。一系列10种[ReX(CO)3(formN)]形式的rh(I)三羰基配合物(ĈN是双齿NHC配体,X是单齿阴离子配体:Cl –,RCO 2 –)是通过来自Re(I)前体化合物Re(CO)5 Cl的Ag 2 O转金属方案。合成的偶氮盐和Re(I)配合物的特征在于元素分析和1 H和13 C NMR光谱,并通过单晶X射线衍射确定一种咪唑鎓盐和7种Re(I)配合物的分子结构。1 [ReCl(CO)3(1-(2-吡啶基)-3-甲基咪唑啉)的乙腈-d 3溶液的1 H NMR和质谱研究表明,单齿氯化物配体不稳定,与该溶剂交换后生成阳离子乙腈加合物。首次报道了用tech
Cr-Catalyzed Direct <i>ortho</i>-Aminomethylation of Phenols
作者:Junbin Shi、Yubin Wang、Qingqing Bu、Binyuan Liu、Bin Dai、Ning Liu
DOI:10.1021/acs.joc.1c01406
日期:2021.12.17
through the direct and efficient ortho-aminomethylation of N,N-dimethylanilines with phenols. The approach showed excellent site selectivity at the ortho-position of phenols and accommodated broad substrate scope and functional group compatibility for both N,N-dimethylanilines and phenols. Mechanistic studies revealed that the direct ortho-aminomethylation between N,N-dimethylanilines and phenols occurred
我们开发了一种 Cr 催化的策略,用于通过N,N-二甲基苯胺与苯酚的直接且有效的邻氨基甲基化来区域选择性地形成 C sp 2 -C sp 3键。该方法在苯酚的邻位显示出优异的位点选择性,并适应N,N-二甲基苯胺和苯酚的广泛底物范围和官能团相容性。机理研究表明,N,N-二甲基苯胺和苯酚之间的直接邻氨基甲基化是通过离子机制发生的。
Rational Design of Cobalt Complexes Based on the <i>trans</i> Effect of Hybrid Ligands and Evaluation of their Catalytic Activity in the Cycloaddition of Carbon Dioxide with Epoxide
作者:Wen-Yue Song、Qiuli Liu、Qingqing Bu、Donghui Wei、Bin Dai、Ning Liu
DOI:10.1021/acs.organomet.0c00525
日期:2020.10.12
ng substrates such as internal epoxides and fatty acid derived epoxides. A key factor in the success of the strategy is the use of cobalt complexes that are prepared on the basis of the trans effect of hybridligands. The trans effect between N-heterocyclic carbenes and acetylacetone has been proved by a number of spectroscopic measurements, including UV–vis, ESI-MS, EPR, and in situ FT-IR and by DFT