Simple, efficient and reusable Pd–NHC catalysts for hydroamination
作者:Qian Chen、Lanlan Lv、Meng Yu、Yanhui Shi、Yuling Li、Guangsheng Pang、Changsheng Cao
DOI:10.1039/c3ra42990c
日期:——
series of chelating NHC–palladium complexes with different alkane-bridges of the type Pd[NHC–(CH2)n–NHC]X2 (X = Br or Cl, n = 2–4) were synthesized, where NHC is a triazolyl-N-heterocyclic carbene donor ligand. The bromide complexes with n = 2 and 3 were characterized by X-ray crystallography. The effects of the length of the bridge and halide ligand on the catalytic reactivity in the hydroamination reaction
Synthesis of novel carbohydrate-based valine-derived formamide organocatalysts by CuAAC click chemistry and their application in asymmetric reduction of imines with trichlorosilane
作者:Xin Ge、Chao Qian、Xinzhi Chen
DOI:10.1016/j.tetasy.2014.10.003
日期:2014.11
organocatalysts combining carbohydrate and N-formyl-l-valine derivatives were prepared by CuII-catalyzed diazotransfer and CuI-catalyzed azide–alkyne 1,3-dipolar cycloaddition CuAACclickchemistry. It was found that the carbohydrate-based valine-derived formamide organocatalyst had high catalytic activity for the asymmetric reduction of imines with trichlorosilane. The reduction can proceed at room
Synthesis of Group 4 Metal Complexes Stabilized by an Amine-Bridged Bis(phenolato) Ligand and Their Catalytic Behavior in Intermolecular Hydroamination Reactions
bis(phenolato) ligand, have been synthesized and characterized. Although 1 and 2 were inactive in catalyzing intermolecularhydroamination reactions, cationic complexes generated in situ from treatment of 1 and 2 with borate [Ph3C][B(C6F5)4], respectively, were found to be highly active. In general, excellent yields (up to >99%) and 100% regioselectivity for a broad range of terminalalkynes and anilines
Asymmetric reduction of imines with trichlorosilane catalyzed by valine-derived formamide immobilized onto magnetic nano-Fe<sub>3</sub>O<sub>4</sub>
作者:Xin Ge、Chao Qian、Xiaoming Ye、Xinzhi Chen
DOI:10.1039/c5ra08516k
日期:——
were synthesized by anchoring valine-derived formamide onto the surface of Fe3O4 magnetic nanoparticles, which were applied in the asymmetricreduction of imines with trichlorosilane at room temperature in toluene. The high level of yield and enantioselectivity catalyzed by magnetic nano-Fe3O4-supported organocatalysts was obtained. In the immobilization process, CuI-catalyzed azide-alkyne 1,3-dipolar
通过将缬氨酸衍生的甲酰胺固定在Fe 3 O 4磁性纳米颗粒的表面上,合成了磁性纳米Fe 3 O 4负载的有机催化剂,并将其应用于室温下用三氯硅烷在甲苯中不对称还原亚胺。获得了磁性纳米Fe 3 O 4负载的有机催化剂催化的高产率和对映选择性。在固定过程中,Cu I催化的叠氮化物-炔烃1,3-偶极环加成(CuAAC)“点击化学”用作锚定桥。磁性纳米颗粒可以简化有机催化剂的回收及其从反应体系中的分离。通过外部磁体,催化剂可以循环使用五次,而活性没有明显下降。
Gallium Trichloride Catalyzed Hydroamination of Alkynes: Scope, Limitation, and Mechanistic Studies by DFT
作者:Lei Li、Genping Huang、Zhou Chen、Wei Liu、Xiufang Wang、Yanmei Chen、Lijuan Yang、Wu Li、Yahong Li
DOI:10.1002/ejoc.201200829
日期:2012.10
The successful application of galliumtrichloride as a catalyst for the intermolecular hydroamination of alkynes with aromatic amines is reported. The reaction is effective with many aniline derivatives and shows exclusive selectivity for the Markovnikov products. The mechanism of the transformation was investigated by DFT calculations and a plausible pathway is proposed.