Mizoroki–Heck Reaction of Unstrained Aryl Ketones via Ligand-Promoted C–C Bond Olefination
作者:Mei-Ling Wang、Hui Xu、Han-Yuan Li、Biao Ma、Zhen-Yu Wang、Xing Wang、Hui-Xiong Dai
DOI:10.1021/acs.orglett.1c00296
日期:2021.3.19
Mizoroki–Heck reaction of unstrained arylketone with acrylate/styrene is accomplished via palladium-catalyzed ligand-promoted C–C bond cleavage. Various (hetero)arylketones are compatible in the reaction, affording the alkene product in good to excellent yields. Further applications in the late-stage olefination of some drugs, natural products, and fragrance-derived arylketones demonstrate the synthetic utility
Photoredox/Cobalt Dual Catalysis for Visible-Light-Mediated Alkene–Alkyne Coupling
作者:Pramod Rai、Kakoli Maji、Biplab Maji
DOI:10.1021/acs.orglett.9b01201
日期:2019.5.17
Dual photoredox transition-metal catalysis has recently emerged as a powerful tool for making synthetically challenging carbon–carbon bonds under milder reaction conditions. Herein, we report on the visible-light-mediated controlled generation of low-valent cobalt catalyst without the need for a metallic reductant. It enabled C–C bondformation via ene-yne coupling at roomtemperature. The generality
Ru(II)-Catalyzed Oxidative Olefination of Benzamides: Switchable Aza-Michael and Aza-Wacker Reaction for Synthesis of Isoindolinones
作者:Manoj Kumar、Shalini Verma、Akhilesh K. Verma
DOI:10.1021/acs.orglett.0c01237
日期:2020.6.19
Selective tandem oxidative C–H olefination–aza-Michael/aza-Wacker reaction of N-arylbenzamides is achieved by fine-tuning between base and additive to access valuable 3-oxoisoindolinyls and 3-oxoisoindolinylidenes, respectively. Careful optimization and control experiments provides a guiding principle in the design of a proposed catalytic cycle. The copper–iminium complex acting as a precursor for
Synthesis of 3-Nitropyrrolidines via Dipolar Cycloaddition Reactions Using a Modular Flow Reactor
作者:Steven Ley、Marcus Baumann、Ian Baxendale
DOI:10.1055/s-0029-1219344
日期:2010.3
The generation and subsequent use of unstabilised azomethine ylides in dipolar cycloaddition reactions within a flow microreactor is demonstrated. The 3-nitropyrrolidines produced were furthermore subjected to chemoselective hydrogenation reac- tions using the H-Cube ® system. To ensure product purities in ex- cess of 90-95%, immobilised scavengers were successfully employed.
We report the ligand‐enabled C−H activation/olefination of freecarboxylicacids in the γ‐position. Through an intramolecular Michael addition, δ‐lactones are obtained as products. Two distinct ligand classes are identified that enable the challenging palladium‐catalyzed activation of freecarboxylicacids in the γ‐position. The developed protocol features a wide range of acid substrates and olefin