Electronic Nature of Ketone Directing Group as a Key To Control C-2 vs C-4 Alkenylation of Indoles
作者:Veeranjaneyulu Lanke、Kiran R. Bettadapur、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.6b02698
日期:2016.11.4
A novel mode of achieving site selectivity between C-2 and C-4 positions in the indole framework by altering the property of the ketone directing group is disclosed. Methyl ketone, as directing group, furnishes exclusively C-2 alkenylated product, whereas trifluoromethyl ketone changes the selectivity to C-4, indicating that the electronic nature of the directing group controls the unusual choice between
Iridium-catalyzed carbonyl group-directed oxidative coupling of arenes with alkenes
作者:Kumaran Elumalai、Weng Kee Leong
DOI:10.1016/j.tetlet.2017.11.058
日期:2018.1
The iridium complex [Cp∗IrCl2]2 is a good catalyst for the directed oxidative coupling of arenes with alkenes; a wide range of carbonyl functionalities (NHCOR, CONH2 and COR) can be employed as the directing group.
Phenanthroline-based microporous organic polymer as a platform for an immobilized palladium catalyst for organic transformations
作者:Chang-An Wang、Kun Nie、Guo-Dong Song、Yan-Wei Li、Yin-Feng Han
DOI:10.1039/c9ra00460b
日期:——
phenanthroline skeleton embedding into the microporouspolymer framework, the Phen-MOP can serve as a platform to support a transition metal catalyst. After being post-modified with palladium acetate, the synthesized Phen-Pd-MOP framework can serve as a highly efficient heterogeneous catalyst for the Suzuki–Miyauracouplingreaction and the Heck couplingreaction. Moreover, the Phen-Pd-MOP catalyst could
Ligand-free Pd-catalyzed highly selective arylation of activated and unactivated alkenes <i>via</i> oxidative and reductive heck coupling
作者:Mixiang Tian、Qinghong Cui、Qiuling Xu、Wenwen Wu、Yuxian Wang、Kun Wei、Ruifen Sun、Junliang Wang
DOI:10.1039/d3ra08186a
日期:——
We developed a solvent-free, mild, and efficient protocol for Heck–Mizoroki reactions under ultrasonic irradiation in open air, which would be predictable and robust using a range of substrates.
Immobilized palladium nanoparticles on potassium zirconium phosphate as an efficient recoverable heterogeneous catalyst for a clean Heck reaction in flow
Palladium nanoparticles on layered potassium a-zirconium phosphate (PdNP/alpha-ZrPK) with high palladium loading (10.6 wt%) have been prepared and used as catalyst in low amount (0.1 mol% of Pd) in the Heck reaction of methyl acrylate and styrene with a series of aryl iodides in CH3CN/H2O azeotrope as a green medium. The procedure has been optimized under flow conditions obtaining an extremely low waste production (E-factor) and allowing to isolate the final product with very low residual palladium content without any purification step. (C) 2015 Elsevier B.V. All rights reserved.