Nickel-Catalyzed Cyanation of Aryl Chlorides and Triflates Using Butyronitrile: Merging Retro-hydrocyanation with Cross-Coupling
作者:Peng Yu、Bill Morandi
DOI:10.1002/anie.201707517
日期:2017.12.4
We describe a nickel‐catalyzed cyanation reaction of aryl (pseudo)halides that employs butyronitrile as a cyanating reagent instead of highly toxic cyanide salts. A dual catalytic cycle merging retro‐hydrocyanation and cross‐coupling enables the conversion of a broad array of arylchlorides and aryl/vinyl triflates into their corresponding nitriles. This new reaction provides a strategically distinct
[EN] SYNTHESIS OF DIFLUOROMETHYL ETHERS AND SULFIDES<br/>[FR] SYNTHÈSE DE DIFLUOROMÉTHYLÉTHERS ET DE DIFLUOROMÉTHYLSULFURES
申请人:UNIV CALIFORNIA
公开号:WO2014107380A1
公开(公告)日:2014-07-10
The synthesis of difluoromethyl ethers and sulfides with a simple, non-ozone- depleting reagent is described. The difluoromethylation of phenols with this reagent occurs at room temperature within minutes with exceptional functional group tolerance. The mild conditions makes possible tandem processes for the conversion of aryl boronic acids, aryl halides and arenes to difluoromethyl ethers. Mechanistic studies support a reaction pathway involving nucleophilic attack of the phenolate to difluorocarbene.
A General Method for Suzuki–Miyaura Coupling Reactions Using Lithium Triisopropyl Borates
作者:Matthias A. Oberli、Stephen L. Buchwald
DOI:10.1021/ol302063g
日期:2012.9.7
Conditions for the Suzuki–Miyauracoupling of lithium triisopropyl borates are reported, as well as a procedure for a one-pot lithiation, borylation, and subsequent Suzuki–Miyauracoupling of various heterocycles with aryl halides. These borate species are much more stable toward protodeboronation than the corresponding boronic acids and can conveniently be stored on benchtop at room temperature.
Palladium-Catalyzed Enantioselective α-Arylation of α-Fluoroketones
作者:Zhiwei Jiao、Jason J. Beiger、Yushu Jin、Shaozhong Ge、Jianrong Steve Zhou、John F. Hartwig
DOI:10.1021/jacs.6b09580
日期:2016.12.14
carbonyl compounds is a widely practiced method for C-C bondformation. Several enantioselective versions of this process have been reported, but intermolecular, enantioselective coupling reactions of aryl electrophiles with α-fluoro carbonyl compounds have yet to be disclosed. We report enantioselective coupling of aryl and heteroaryl bromides and triflates with α-fluoroindanones catalyzed by palladium
Described are palladium precatalysts, and methods of making and using them. The palladium precatalysts show improved stability and improved reactivity in comparison to previously-described palladium precatalysts.