Palladium-Catalyzed Direct C–H Allylation of Electron-Deficient Polyfluoroarenes with Alkynes
作者:Jun Zheng、Bernhard Breit
DOI:10.1021/acs.orglett.8b00393
日期:2018.4.6
A palladium-catalyzed intermolecular direct C–H allylation of polyfluoroarenes with alkynes is reported. Unlike classic hydroarylation reactions, alkynes are used as allylic electrophile surrogates in this direct aromatic C–H allylation. As an atom-economic and efficient method, various linear allylated fluoroarenes were synthesized from two simple and easy-to-access feedstocks in good to excellent
C−Boron Enolates Enable Palladium Catalyzed Carboboration of Internal 1,3‐Enynes
作者:Ziyong Wang、Jason Wu、Walid Lamine、Bo Li、Jean‐Marc Sotiropoulos、Anna Chrostowska、Karinne Miqueu、Shih‐Yuan Liu
DOI:10.1002/anie.202108534
日期:2021.9.20
generated by a kinetically controlled halogenexchange between chlorocatecholborane and silylketene acetals, is described. These C−boron enolates are demonstrated to activate 1,3-enyne substrates in the presence of a Pd0/Senphos ligand complex, resulting in the first examples of a carboboration reaction of an alkyne with enolate-equivalent nucleophiles. Highly substituted dienyl boron building blocks are
Palladium–NHC-Catalyzed Allylic Alkylation of Pronucleophiles with Alkynes
作者:Wei Ren、Qian-Ming Zuo、Yan-Ning Niu、Shang-Dong Yang
DOI:10.1021/acs.orglett.9b02937
日期:2019.10.4
The palladium-N-heterocyclic carbene (NHC)-catalyzed allylicalkylation of various pronucleophiles with alkynes has been accomplished under mild conditions. The protocol exhibits broad functional group compatibility and high atom economy. Moreover, the catalytic process avoids the use of external oxidants and acid as additives.
Underwatergasshiftconditionsacetylenes are selectively converted into furan-2(5H)-ones with catalysis by rhodium carbonyl clusters.
在水煤气变换条件下,乙炔被羰基铑簇催化选择性地转化为呋喃-2(5 H)-1 。
In Situ Generation of 1-Propyne: A Useful Introduction of 1-Propyne on Unsaturated Halogenated Compounds through the Sonogashira Reaction
作者:Estelle Abraham、Jean Suffert
DOI:10.1055/s-2002-19769
日期:——
Reaction of (E/Z)-1-bromopropene with exactly 1.42 equivalents of nBuLi followed by addition of water produces in situ a THF solution of propyne. Addition of a vinylic or aromatic halogenated substrates, Pd(PPh3)2Cl2, CuI and an amine to this solution give high yield of the corresponding coupling product bearing a propyne moiety. This practical procedure avoids the use of expensive and inflammable propyne gas which need a special apparatus for bubbling it into the reaction flask.