Trineopentylphosphine: A Conformationally Flexible Ligand for the Coupling of Sterically Demanding Substrates in the Buchwald–Hartwig Amination and Suzuki–Miyaura Reaction
作者:Steven M. Raders、Jane N. Moore、Jacquelynn K. Parks、Ashley D. Miller、Thomas M. Leißing、Steven P. Kelley、Robin D. Rogers、Kevin H. Shaughnessy
DOI:10.1021/jo400435z
日期:2013.5.17
palladium provides a highly effective catalyst for the Buchwald–Hartwig coupling of sterically demanding aryl bromides and chlorides with stericallyhindered aniline derivatives. Excellent yields are obtained even when both substrates include 2,6-diisopropyl substituents. Notably, the reaction rate is inversely related to the steric demand of the substrates. X-ray crystallographic structures of Pd(TNpP)2,
三叔戊基膦(TNpP)与钯的结合为空间受限的芳族溴化物和氯化物与空间受阻的苯胺衍生物的布赫瓦尔德-哈特维格偶联提供了一种高效的催化剂。即使两个底物都包含2,6-二异丙基取代基,也可获得优异的产率。值得注意的是,反应速率与底物的空间需求成反比。Pd(TNpP)2,[Pd(4- t -Bu-C 6 H 4)(TNpP)(μ-Br)] 2和[Pd(2-Me-C 6 H 4)的X射线晶体结构(TNpP)(μ-Br)] 2被报道。这些结构表明,TNpP配体的构象柔韧性在允许催化剂偶联受阻底物方面起着关键作用。Pd / TNpP系统对受阻芳基溴化物的Suzuki偶联也显示出良好的活性。
NEW COMPOUNDS I/418
申请人:Bjore Annika
公开号:US20080015237A1
公开(公告)日:2008-01-17
There is provided compounds of formula I,
wherein R
1
to R
7
have meanings given in the description, which are useful in the prophylaxis and in the treatment of arrhythmias, in particular atrial and ventricular arrhythmias.
method for the deprotonative silylation of aromatic C–H bonds has been developed using trifluoromethyltrimethylsilane (CF3SiMe3, Ruppert–Prakash reagent) and a catalytic amount of fluoride. In this reaction, CF3SiMe3 is considered to act as a base and a silicon electrophile. This process is highly tolerant to various functional groups on heteroarenes and benzenes. Furthermore, this method can be applied
Electron-Poor, Fluoro-Containing Arylboronic Acids as Efficient Coupling Partners for Bis(1,5-cyclooctadiene)nickel(0)/Tricyclohexylphosphine-Catalyzed Cross-Coupling Reactions of Aryl Arenesulfonates
作者:Wen-Bo Chen、Chun-Hui Xing、Jie Dong、Qiao-Sheng Hu
DOI:10.1002/adsc.201600205
日期:2016.6.30
The use of electron‐poor, fluoro‐containing arylboronicacids as general coupling partners for nickel(0)/tricyclohexylphosphine‐catalyzed cross‐coupling of aryl arenesulfonates is described. Electron‐poor fluoro‐containing arylboronicacids were found to react faster than electron‐rich/neutral arylboronicacids, with (4‐methoxyphenyl)(4‐methylbenzenesulfonato‐κO)bis(tricyclohexylphosphine)nickel. Bis(1
Palladium nanoparticles stabilized by sterically hindered phosphonium salts as Suzuki cross-coupling catalysts
作者:V. V. Ermolaev、D. M. Arkhipova、L. Sh. Nigmatullina、I. Kh. Rizvanov、V. A. Milyukov、O. G. Sinyashin
DOI:10.1007/s11172-013-0088-z
日期:2013.3
Palladium nanoparticles with an average size of 2.5±0.5 nm formed from palladium acetate in the presence of tri-tert-butyl(decyl)phosphonium tetrafluoroborate without an additional reducing agent exhibit high activity as a catalyst for the Suzuki cross-coupling reaction involving bromo- and chloroarenes under mild conditions.