Synthesis and catalytic activity of a complex of 1,1´-bis-isoquinoline N,N´-dioxide with PdCl2
作者:L. A. Bulygina、N. S. Khrushcheva、V. I. Sokolov、A. A. Khodak
DOI:10.1007/s11172-015-0880-z
日期:2015.2
A novel complex of 1,1´-bis-isoquinoline N,N´-dioxide with PdCl2 was synthesized. This complex efficiently catalyzes the Suzuki cross-couplings and hydroarylation of norbornene.
Cyclopalladated complex of 1-ferrocenylisoquinoline
作者:L. A. Bulygina、N. S. Khrushcheva、A. S. Peregudov、V. I. Sokolov
DOI:10.1007/s11172-015-0834-5
日期:2015.1
A new dimeric cyclopalladated ferrocenyl complex di-µ -chloro-bis[2-(1-isoquinolinyl)ferrocenyl](C,N)dipalladium was obtained and characterized. Its catalytic properties in the Heck and Suzuki reactions (including a solid-phase version), as well as in hydroarylation of norbornene, were studied.
palladium-catalyzed Heck-type hydroarylation of norbornene and its derivatives. The ligands with a medium sized alkyl group on the oxazoline ring provided higher enantioselectivities. The presence of electron-donating substituents on the aryl iodide increased the selectivity and the yield of the reactions. The configuration of (−)-exo-2-phenylbicyclo[2.2.1]heptane has been assigned as (1R,2R).
Detailed Characterization of <i>p</i>-Toluenesulfonic Acid Monohydrate as a Convenient, Recoverable, Safe, and Selective Catalyst for Alkylation of the Aromatic Nucleus
作者:Mathew P. D. Mahindaratne、Kandatege Wimalasena
DOI:10.1021/jo971832r
日期:1998.5.1
Alkylation of the aromatic nucleus, an important reaction in industry and synthetic organic chemistry, has traditionally been carried out by the well-known Friedel-Crafts reaction employing Lewis acid catalysts such as AlCl3 and BF3 or by using highly reactive organometallic reagents. Although protic acids such as anhydrous HF and concentrated H2SO4 have also been used in the alkylation of the aromatic nucleus, the notoriously corrosive, highly toxic, and hazardous nature of these agents has precluded their common use under ordinary laboratory conditions. Various organic sulfonic acids have, on occasion, been used as catalysts in Friedel-Crafts alkylations, but to our knowledge the chemistry and the scope of these reactions for common laboratory use have never been exploited in detail. In the present study we have characterized commercially available p-toluenesulfonic acid monohydrate (TsOH) as an efficient catalyst for the intermolecular coupling of the aromatic nucleus with activated alkyl halides, alkenes, or tosylates under mild conditions in an open atmosphere. In comparison to conventional Friedel-Crafts catalysts such as AlCl3, BF3, HF, and concentrated H2SO4, the extent of the formation of undesired products from side reactions such as transalkylation, polymerization, etc. was minimal with the TsOH-catalyzed reaction. The ability to recover and reuse the catalyst from the reaction mixtures, minimal generation of environmentally unfriendly waste, high specificity of the reaction, and the low cost of the catalyst are important advantages of the TsOH catalyst over the other conventional Friedel-Crafts catalysts.