Sequentially Pd/Cu‐Catalyzed Alkynylation‐Oxidation Synthesis of 1,2‐Diketones and Consecutive One‐Pot Generation of Quinoxalines
作者:Patrik Niesobski、Ivette Santana Martínez、Sebastian Kustosz、Thomas J. J. Müller
DOI:10.1002/ejoc.201900783
日期:2019.9
A sequentially Pd/Cu‐catalyzed alkynylation‐oxidation reaction furnishes 1,2‐diketones in a one‐pot fashion. This one‐pot process can be successfully concatened with a cyclocondensation to furnish a consecutive multicomponent synthesis of quinoxalines.
N,N′-Dimethyl-S,S-diaryl oxosulfonium triflates are easily prepared from the corresponding sulfoximines by treatment with methyl trifluoromethanesulfonat. In palladium-catalyzed Sonogashira-, Heck- and Suzuki-type cross-couplingreactions, such salts can be applied a readily available aryl source. High aryl transfer selectivities have been observed in competition experiments.
Copper- and Ligand-Free Sonogashira Reaction Catalyzed by Pd(0) Nanoparticles at Ambient Conditions under Ultrasound Irradiation
作者:Atul R. Gholap、K. Venkatesan、Renu Pasricha、Thomas Daniel、Rajgopal J. Lahoti、Kumar V. Srinivasan
DOI:10.1021/jo0503815
日期:2005.6.1
The Sonogashira reaction proceeds at ambient temperature (30 degrees C) in acetone or room-temperature ionic liquid, 1,3-di-n-butylimidazolium tetrafluoroborate ([bbim]BF4), as solvent under ultrasound irradiation to give enhanced reaction rates, excellent chemoselectivity, and high yields in the absence of a copper cocatalyst and a phosphine ligand. TEM analysis showed the formation of stable, crystalline, and polydispersed Pd(0) nanoparticles as catalyst for the reaction.