Co<sup>III</sup>
-Catalyzed Isonitrile Insertion/Acyl Group Migration Between C−H and N−H bonds of Arylamides
作者:Deepti Kalsi、Nagaraju Barsu、Basker Sundararaju
DOI:10.1002/chem.201705710
日期:2018.2.16
A general efficient and site‐selective cobalt‐catalyzed insertion of isonitrile into C−H and N−H bonds of arylamides through C−H bond activation and alcohol assisted intramolecular trans‐amidation is demonstrated. This straightforward approach overcomes the limitation by the presence of strongly chelating groups. Isolation of CoIII‐isonitrile complex B has been achieved for the first time to understand
Aryne Multicomponent Reactions by Directed C−H Activation
作者:Sunil Kumar Sunnam、Jitendra D. Belani
DOI:10.1002/chem.202100205
日期:2021.6.16
Arylation via ortho C−Hactivation by the aid of directing groups has been explored recently by many researchers. Herein, a palladium-catalyzed C−H arylation using 8-aminoquinoline as a bidentate directing group has been developed. The reaction furnishes only C−H arylation, unlike previous methods where cyclization to corresponding isoquinolones is observed. More interestingly, sequential C−H functionalization
Rh-Catalyzed, Regioselective, C–H Bond Functionalization: Access to Quinoline-Branched Amines and Dimers
作者:M. Damoder Reddy、Frank R. Fronczek、E. Blake Watkins
DOI:10.1021/acs.orglett.6b02848
日期:2016.11.4
Rh-catalyzed, chelation-induced, C-5 regioselectiveC–Hfunctionalization of 8-amidoquinolines with a range of N-Boc aminals is reported for the first time. The addition of in situ generated imines to C(sp2)–H bonds afforded branched amines in good to excellent yields. Moreover, this transformation features good functional group compatibility, broad substrate scope, and mild reaction conditions and
Divergence between Organometallic and Single-Electron-Transfer Mechanisms in Copper(II)-Mediated Aerobic C–H Oxidation
作者:Alison M. Suess、Mehmed Z. Ertem、Christopher J. Cramer、Shannon S. Stahl
DOI:10.1021/ja4026424
日期:2013.7.3
Copper(II)-mediated C-H oxidation is the subject of extensive interest in synthetic chemistry, but the mechanisms of many of these reactions are poorly understood. Here, we observe different products from Cu(II)-mediated oxidation of N-(8-quinolinyl)benzamide, depending on the reaction conditions. Under basic conditions, the benzamide group undergoes directed C-H methoxylation or chlorination. Under
铜 (II) 介导的 CH 氧化是合成化学中广泛关注的主题,但对其中许多反应的机制知之甚少。在这里,我们观察到来自铜(II)介导的 N-(8-喹啉基)苯甲酰胺氧化的不同产物,具体取决于反应条件。在碱性条件下,苯甲酰胺基团发生定向的 CH 甲氧基化或氯化。在酸性条件下,喹啉基团发生非定向氯化。实验和计算机制研究表明,前一种条件下的有机金属 CH 活化/功能化机制和后一种条件下的单电子转移机制。这种罕见的发散性观察,
Nickel‐Catalyzed C
<sub>sp2</sub>
−OMe Functionalization for Chemoselective Aromatic Homologation En Route to Nanographenes
A Ni(0)-catalyzed methodology efficiently achieves Csp2−OMe functionalization in the presence of internal alkynes, forming chemoselectively either aromatic homologation or intramolecular monoannulation products. Furthermore, aromatic homologation products are proven as valid precursors for further diversification towards nanographene-like synthesis.
Ni(0) 催化的方法在内部炔烃存在下有效地实现了 C sp2 -OMe 官能化,从而化学选择性地形成芳族同系物或分子内单环化产物。此外,芳香族同系化产物被证明是有效的前体,可进一步向类纳米石墨烯合成多样化。