Palladium-Catalyzed Amination of Aryl Halides: Mechanism and Rational Catalyst Design
作者:John Hartwig
DOI:10.1055/s-1997-789
日期:1997.4
Palladium complexes of trio-o-tolyl phosphine and bis(diphenylphospino)ferrocene catalyze the reaction between aryl halides and either tin amides or amines in the presence of base to form aryl amines by halide substitution. This account describes our mechanistic and synthetic studies related to the amination reactions. These studies include kinetic behavior of the catalytic systems as well as direct
A General Procedure to Selectively Prepare<i>N</i>-Alkylanilines by an Unexpected Reaction of (<i>Z</i>)-(<i>tert</i>-Butylsulfanyl)(aryl)diazenes with Alkyllithium Reagents
has been set up to prepare, selectively, the N-monoalkylanilines 7, reacting (Z)-(tert-butylsulfanyl)(aryl)diazenes 3 with alkyllithium 6 (MeLi, BuLi, s-BuLi, n-C 6 H 1 3 Li). The reactions were carried out in anhydrous diethyl ether at 0 °C or -78 °C, depending on the reagent 6, and then at room temperature. In optimal conditions the yields of the pure products 7 (uncontaminated by dialkylation products)
Iridium complexes with ligands of 1,8-Naphthyridine-2-carboxylic acid derivatives-preparation and catalysis
作者:Ming Li、Yen-Pin Hsu、Yi-Hung Liu、Shie-Ming Peng、Shiuh-Tzung Liu
DOI:10.1016/j.jorganchem.2020.121537
日期:2020.11
8-naphthyridine(Np)-2-carboxylic derivatives L1-L3 [L1 = Np-2-COOH, L2 = Np-2-CONH2, L3 = Np-2-CONHCH2Py] with [Ir(COD)(µ-OMe)]2 yielded the corresponding complexes [Ir(COD)(Ln)] (1~3, n = 1~3, respectively). The potential tridentate L3 behaves as a bidentate donor in the complex 3. Treatment of L1 with [Ir(COD)Cl]2 under nitrogen atmosphere gave a Ir(III) hydride complex [Ir(COD)(L1)HCl] (4). However, carrying
conditions. The merger of heterogeneous photocatalysts and transition metal catalysts has recently drawn much attention due to its versatility for organic transformations. However, these semi-heterogenous systems suffered several drawbacks, such as transition metal agglomeration on the heterogeneous surface, hindering further applications. Here, we introduce heterogeneoussingle Ni atoms supported on carbon
可见光驱动的有机转化对于在温和条件下合成有价值的精细化学品具有很大的意义。非均相光催化剂和过渡金属催化剂的结合由于其在有机转化方面的多功能性而备受关注。然而,这些半异质体系存在一些缺点,例如过渡金属在异质表面上团聚,阻碍了进一步的应用。在这里,我们引入了氮化碳 (NiSAC/CN) 上负载的异质单 Ni 原子,用于可见光驱动的 C-N 功能化,具有广泛的基底范围。与半非均相系统相比,由于金属-载体相互作用,观察到高活性和稳定性。此外,通过系统的实验机理研究,我们证明CN上稳定的单个Ni原子有效地改变了它们的氧化还原态,从而导致C-N耦合的完整光氧化还原循环。
General Method for the Amination of Aryl Halides with Primary and Secondary Alkyl Amines via Nickel Photocatalysis
the coupling of electron-rich and electron-poor aryl halides with both primary and secondary alkyl amines. In this study, it is reported that a Ni(II)-bipyridine complex catalyzes efficient C–N coupling of aryl chlorides and bromides with various primary and secondary alkyl amines under direct excitation with light. Intramolecular C–N coupling is also demonstrated. The feasibility and applicability of