A Combination of Copper(0) Powder and Selectfluor Enables Generation of Cationic Copper Species for Mild 1,2-Dicarbonylation of Alkynes
摘要:
A combination of copper powder and Selectfluor permits the generation of cationic copper species that efficiently catalyze 1,2-dicarbonylation of alkynes under mild conditions with water and dioxygen as inexpensive and environmentally benign sources of oxygen.
Palladium-Catalyzed Desulfitative Cross-Coupling of Arylsulfonyl Hydrazides with Terminal Alkynes: A General Approach toward Functionalized Internal Alkynes
A palladium-catalyzed Sonogashira-type coupling between arylsulfonyl hydrazides and terminalalkynes via Ar(C)–S bond cleavage is disclosed, which enables the general synthesis of functionalized internalalkynes, especially the Br-substituted ones, in good to excellent yields under acid- and base-free conditions.
Ligand-controlled iridium-catalyzed semihydrogenation of alkynes with ethanol: highly stereoselective synthesis of <i>E</i>- and <i>Z</i>-alkenes
作者:Jinfei Yang、Chengniu Wang、Yufeng Sun、Xuyan Man、Jinxia Li、Fei Sun
DOI:10.1039/c8cc09714c
日期:——
iridium-catalyzed semihydrogenation of alkynes to E- and Z-alkenes with ethanol was developed. Effective selectivity control was achieved by ligand regulation. The use of 1,2-bis(diphenylphosphino)ethane (DPPE) and 1,5-cyclooctadiene (COD) was critical for the stereoselective semihydrogenation of alkynes. The general applicability of this procedure was highlighted by the synthesis of more than 40 alkenes, with
The synthesis of brominated-boron-doped PAHs by alkyne 1,1-bromoboration: mechanistic and functionalisation studies
作者:K. Yuan、R. J. Kahan、C. Si、A. Williams、S. Kirschner、M. Uzelac、E. Zysman-Colman、M. J. Ingleson
DOI:10.1039/c9sc05404a
日期:——
The synthesis of a range of brominated-Bn-containing (n = 1, 2) polycyclic aromatic hydrocarbons (PAHs) is achieved simply by reacting BBr3 with appropriately substituted alkynes via a bromoboration/electrophilic C–H borylation sequence.
An efficient protocol for copper-free palladium-catalyzed Sonogashira cross-coupling in aqueous media at low temperatures
作者:Alexander N. Marziale、Johannes Schlüter、Jörg Eppinger
DOI:10.1016/j.tetlet.2011.09.031
日期:2011.11
A thorough study on copper-freeSonogashira cross-couplings in water was carried out using the palladacycle, [Pd(μ-Cl)κ2-P,C-P(iPr)2(OC6H3-2-Ph)}}2] as pre-catalyst with different bases and palladium concentrations. The highly active pre-catalyst imparts good to near quantitative yields using a concentration of 0.25 mol % at 40 °C. This broadly applicable protocol exhibits high tolerance of functional
The catalytic Sonogashira couplingreaction of terminal alkynes and aryl halides is developed using copper(II) oxide nanoparticles as catalyst in dimethyl sulfoxide. The procedure is experimentally simple, general, efficient, and free from addition of external cocatalysts or chelating ligands. copper(II) oxide nanoparticles - Sonogashira coupling - ligand-free - nano catalyst