Regio- and Stereoselective Route to Tetrasubstituted Olefins by the Palladium-Catalyzed Three-Component Coupling of Aryl Iodides, Internal Alkynes, and Arylboronic Acids
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/jo048265+
日期:2005.5.1
The Pd-catalyzed three-component coupling of readily available aryl iodides, internalalkynes, and arylboronic acids provides a convenient, one-step, regio- and stereoselective route to tetrasubstitutedolefins in good to excellent yields, although electron-poor aryl iodides and dialkylalkynes normally afford only low yields under our standard reaction conditions. The proper combination of substrates
Synthesis of Polysubstituted Alkenes by Heck Vinylation or Suzuki Cross-Coupling Reactions in the Presence of a Tetraphosphane−Palladium Catalyst
作者:Florian Berthiol、Henri Doucet、Maurice Santelli
DOI:10.1002/ejoc.200390161
日期:2003.3
4-tetrakis[(diphenylphosphanyl)methyl]cyclopentane as a catalyst, a range of vinyl bromides undergo Suzukicross-couplings with arylboronic acids in good yields. Furthermore, the catalyst can be used at low loadings, even for reactions of sterically hindered substrates. Mediated by this catalyst, stilbene and 1,1-diphenylethylene undergo Heckreactions with aryl halides to give triarylethylene derivatives
Synthesis of Tetraarylethene Luminogens by C−H Vinylation of Aromatic Compounds with Triazenes
作者:Abdusalom A. Suleymanov、Martin Doll、Albert Ruggi、Rosario Scopelliti、Farzaneh Fadaei‐Tirani、Kay Severin
DOI:10.1002/anie.201908755
日期:2020.6.15
Tetraarylethenes are obtained by acid‐induced coupling of vinyl triazenes with aromatic compounds. This new C−H activation route for the synthesis of aggregation‐induced emission luminogens is simple, fast, and versatile. It allows the direct grafting of triarylethenyl groups onto a variety of aromatic compounds, including heterocycles, supramolecular hosts, biologically relevant molecules, and commercial
Triphenylvinyl bromide (I) and diphenylvinyl iodide (XII) can be made to undergo replacement of the halogen atom by a phenyl group; n-BuLi (2·5 moles) is added to a mixture of the vinyl halide and o-bromofluorobenzene in ether at −78° followed by warming to −35°. The intermediate o-lithium derivative in the reaction of I could be converted to o-methyltetraphenylethylene (VI) by treatment with methyl