Potassium Trimethylsilanolate Enables Rapid, Homogeneous Suzuki−Miyaura Cross-Coupling of Boronic Esters
作者:Connor P. Delaney、Vincent M. Kassel、Scott E. Denmark
DOI:10.1021/acscatal.9b04353
日期:2020.1.3
Herein, a mild and operationally simple method for the Suzuki−Miyaura cross-coupling of boronicesters is described. Central to this advance is the use of the organic-soluble base, potassium trimethylsilanolate, which allows for a homogeneous, anhydrous cross-coupling. The coupling proceeds at a rapid rate, often furnishing products in quantitative yield in less than 5 min. By applying this method
Pd-Catalyzed Suzuki–Miyaura and Hiyama–Denmark Couplings of Aryl Sulfamates
作者:Patrick R. Melvin、Nilay Hazari、Megan Mohadjer Beromi、Hemali P. Shah、Michael J. Williams
DOI:10.1021/acs.orglett.6b02330
日期:2016.11.18
Using a recently discovered precatalyst, the first Pd-catalyzed Suzuki–Miyaura reactions using aryl sulfamates that occur at room temperature are reported. In complementary work, it is demonstrated that a related precatalyst can facilitate the coupling of aryl silanolates, which are less toxic and reactive nucleophiles than boronic acids with aryl chlorides. By combining our results using modern electrophiles
Synthesis and Reactivity of Solid-Supported Organotrifluoroborates in Suzuki Cross-Coupling
作者:Virginie Colombel、Marc Presset、Daniel Oehlrich、Frederik Rombouts、Gary A. Molander
DOI:10.1021/ol300215p
日期:2012.4.6
Solid-supported organotrifluoroborates were prepared in high yields by ion exchange with Amberlyst resins. The reactivity of solid supported aryltrifluoroborates was evaluated in Suzuki Miyaura couplings with numerous aryl bromide partners. Electron-rich and -poor substituents were tolerated on both substrates, providing yields up to 90%. Examples of alkyl-, alkenyl-, alkynyl-, and heteroaryltrifluoborates were also successfully cross-coupled to aryl halides.
Palladium−Indolylphosphine-Catalyzed Hiyama Cross-Coupling of Aryl Mesylates
作者:Chau Ming So、Hang Wai Lee、Chak Po Lau、Fuk Yee Kwong
DOI:10.1021/ol802493z
日期:2009.1.15
Aryl mesylates are found to be applicable as electrophiles in organosilicon-mediated coupling reactions. The catalyst system comprising 2 mol % of Pd(OAc)(2) and CM-phos supporting ligand is highly effective in catalyzing Hiyama cross-coupling of various aryl and heteroaryl mesylates. Interesting acid additive effects show that the presence of 0.25-0.50 equiv of acetic acid efficiently suppresses the mesylate decomposition and generally promotes the coupling product yields.