New benzimidazolium sulfonate salts have been prepared and fully characterized. They have been associated in situ with [RuCl2(p-cymene)]2 to generate efficient catalytic systems operating at 120 °C under neat conditions in the presence of potassium tert-butylate for selective N-alkylation of primary aromatic amines into secondary amines.
Selective radical amination of aldehydic C(sp<sup>2</sup>)–H bonds with fluoroaryl azides via Co(<scp>ii</scp>)-based metalloradical catalysis: synthesis of N-fluoroaryl amides from aldehydes under neutral and nonoxidative conditions
作者:Li-Mei Jin、Hongjian Lu、Yuan Cui、Christopher L. Lizardi、Thiago N. Arzua、Lukasz Wojtas、Xin Cui、X. Peter Zhang
DOI:10.1039/c4sc00697f
日期:——
proven to be an effective metalloradical catalyst for intermolecularamination of C(sp2)–H bonds of aldehydes with fluoroaryl azides. The [Co(P1)]-catalyzed process can employ aldehydes as the limiting reagents and operate under neutral and nonoxidative conditions, generating nitrogen gas as the only byproduct. The metalloradical aldehydic C–H amination is suitable for different combinations of aldehydes
D 2h对称酰胺卟啉 3,5-Di t Bu-IbuPhyrin [Co( P1 )]的 Co( II ) 配合物已被证明是一种有效的金属基催化剂,用于 C(sp 2 )–H 键的分子间胺化醛与氟芳基叠氮化物。[Co( P1 )]-催化过程可以使用醛作为限制试剂并在中性和非氧化条件下运行,产生氮气作为唯一的副产品。金属基醛 C-H 胺化适用于醛和氟芳基叠氮化物的不同组合,产生相应的N-氟芳基酰胺的产率非常好。一系列机理研究支持 Co( II ) 催化的分子间 C-H 胺化的逐步自由基机制。
Elevated Catalytic Activity of Ruthenium(II)-Porphyrin-Catalyzed Carbene/Nitrene Transfer and Insertion Reactions with N-Heterocyclic Carbene Ligands
作者:Ka-Ho Chan、Xiangguo Guan、Vanessa Kar-Yan Lo、Chi-Ming Che
DOI:10.1002/anie.201309888
日期:2014.3.10
characterized. Owing to the strong donor strength of axial NHC ligands in stabilizing the trans MCRR′/MNR moiety, these complexes showed unprecedently high catalytic activity towards alkenecyclopropanation, carbene CH, NH, SH, and OH insertion, alkeneaziridination, and nitrene CH insertion with turnover frequencies up to 1950 min−1. The use of chiral [Ru(D4‐Por)(BIMe)2] (1 g) as a catalyst led to
Chemistry and kinetics of singlet pentafluorophenylnitrene
作者:Russell Poe、Karlyn Schnapp、Mary J. T. Young、Jennifer Grayzar、Matthew S. Platz
DOI:10.1021/ja00039a016
日期:1992.6
The chemistry and kinetics of singlet (pentafluorophenyl)nitrene were studied by chemical trapping and laser flash photolysis techniques. Photolysis of pentafluorophenyl azide in cyclohexane, benzene, diethylamine, pyridine, tetramethylethylene, tetrahydrofuran, dimethyl sulfoxide, and dimethyl sulfide forms adducts in fair to good yeilds. At ambient temperature singlet (pentafluorophenyl) nitrene
Zinc-Mediated Radical Reactions of Per- (or Poly)fluorophenyl Aromatic Aldimines in Aqueous Media
作者:Shizheng Zhu、Shaowu Wang、Xinyuan Liu
DOI:10.1055/s-2004-816004
日期:——
additions of alkylhalides to per- (or poly)fluorophenyl aromatic aldimines using zinc as a single-electron-transfer radical initiator have been studied in aqueousmedia. The reaction proceeds well for imines with different substituents at room temperature under air atmosphere and the corresponding fluorine-containing amines and 1,2-diamines are obtained in poor to,Good yields. A tentative reaction mechanism