quinone compounds, and pharmaceutical molecules. Remarkably, this protocol provides a direct and efficient pathway to achieve an important class of β-silyl carbonyl compounds, and the desired products were obtained in good to excellent yields. Moreover, the catalyst could be recovered easily and work effectively in six recycles. The advantages of this newly developed process include operational simplicity
Palladium‐Catalysed Amide‐Directed Ligand Free C8‐Olefination of 1‐Naphthamides for the synthesis of 2,3‐dihydro‐1<i>H</i>‐benzo[<i>de</i>]isoquinolin‐1‐ones
作者:Suman Maji、Sukumar Pradhan、Karishma Pidiyara、Siddhartha Maiti、Shaeel A. Al‐Thabaiti、Debabrata Maiti
DOI:10.1002/adsc.202300483
日期:2024.2.20
Abstract
This work describes the palladium(II)‐catalyzed regioselective C8‐H olefination of 1‐naphthamides. Interestingly, naphthamide fused lactam 2,3‐dihydro‐1H‐benzo[de]isoquinolin‐1‐one derivatives were also synthesized in the case of a particular class of napthamides. This protocol was found well compatible with a diverse range of acrylates and styrenes leading to product formation in good yields along with a wide functional group tolerance. The developed strategy was further applied to the synthesis of different drug derivatives.
Development of a novel strategy for the palladium-catalyzed selective meta-C–H activation of α-substituted cinnamates and their heterocyclic analogues with various alkenes using nitrile as a directing group (DG) has been described. Importantly, we introduced naphthoquinone, benzoquinones, maleimides and sulfolene as coupling partners in the meta-C–H activation reaction for the first time. Notably,
The palladium-catalyzed remote meta-C–H olefination of geometrically challenging substitutedcinnamates using a nitrile directing group derived from 2-cyanobenzoic acid has been described. This new protocol is applicable to various olefin coupling partners and provides the corresponding meta-olefinated products in very good yields and with high selectivity. In addition, using this methodology, a variety
Catalytic Arene <i>meta</i>-C–H Functionalization Exploiting a Quinoline-Based Template
作者:Uttam Dutta、Atanu Modak、Bangaru Bhaskararao、Milan Bera、Sukdev Bag、Anirban Mondal、David W. Lupton、Raghavan B. Sunoj、Debabrata Maiti
DOI:10.1021/acscatal.7b00247
日期:2017.5.5
Strong sigma-coordination by a heteroatom containing directing group (DG) is one of the effective strategies for performing site-selective C-H functionalization. Despite tremendous progress in directed ortho-C-H functionalization, selective meta-C-H functionalization using strong sigma-coordination remains extremely challenging. Herein, we introduce the 8-nitroquinoline-based DG to ensure the formation of a stable palladacycle which enables selective meta-alkenylation and acetoxylation of arenes. Kinetic experiments, ESI-MS, NMR, and DFT studies provided important information regarding the mechanism of the reaction. The scalability as well as diversification of the products have been examined and are expected to be beneficial in pharmaceutical and material sciences.