A palladium-catalyzed enantioselective coupling of 2,5-cyclohexadienyl-substituted aryl iodides and carbon or heteroatom nucleophiles is described. The reaction proceeded via a tandem asymmetric Heck insertion and Tsuji–Trost allylation, enabling the rapid construction of valuable chiral tetrahydrofluorenes by using a chiral H8-BINOL-based phosphoramidite ligand.
Control of Reversible Activation Dynamics of [Ru{η
<sup>6</sup>
:κ
<sup>1</sup>
‐C
<sub>6</sub>
H
<sub>5</sub>
(C
<sub>6</sub>
H
<sub>4</sub>
)NH
<sub>2</sub>
}(XY)]
<sup>
<i>n</i>
+
</sup>
and the Effect of Chelating‐Ligand Variation
作者:Francisco Martínez‐Peña、Ana M. Pizarro
DOI:10.1002/chem.201701681
日期:2017.11.16
potential use of organoruthenium complexes as anticancer drugs is well known. Herein, a family of activatable tethered ruthenium(II) arene complexes of general formula [Ruη6:κ1‐C6H5(C6H4)NH2}(XY)]n+ (closed tether ring) bearing different chelating XY ligands (XY=aliphatic diamine, phenylenediamine, oxalato, bis(phosphino)ethane) is reported. The activation of these complexes (closed‐ to open‐tether conversion)
有机钌配合物作为抗癌药的潜在用途是众所周知的。在本文中,可活化的拴系的钌的家族(II)芳烃通式的配合物的[Ru η 6:κ 1 -C 6 ħ 5(C 6 H ^ 4)NH 2 }(XY)] ñ +(闭合绳索环)轴承报道了不同的螯合XY配体(XY =脂族二胺,苯二胺,草酸酯,双(膦基)乙烷)。在甲醇和DMSO中,这些络合物的活化(闭链至开链转换)以不同的速率发生,并且在平衡时以不同的反应程度发生。最重要的是,Ru II复合激活(Ru-N系链的裂解键在质子浓度高的水溶液中发生(基于N系链质子化)。活化动力学可以通过XY螯合配体的合理变化来调节。XY的给电子能力和位阻直接影响Ru-N键的反应性,并且XY = N,N'-二甲基,N,N'-二乙基和N,N,N',N'‐四甲基乙二胺的络合物更易于活化。在酸性介质中的这种活化是完全可逆的,并且质子浓度也决定着失活速率,也就是说,束缚环的闭合随着pH
Synthesis and Reactivity of Tethered η<sup>1</sup>:η<sup>6</sup>-(Phosphinoarene)ruthenium Dichlorides
作者:Bruno Therrien、Thomas R. Ward、Melanie Pilkington、Christina Hoffmann、François Gilardoni、Jacques Weber
DOI:10.1021/om970735l
日期:1998.2.1
The coordination properties of ortho- and meta-substituted [(2-diphenylphosphanylethyl)phenyl]methanol 4a and 4b toward ruthenium(II) have been investigated. To ensure coordination of both the arene and the tethered phosphine, the labile ruthenium arene dimer [RuCl2(EtO2CC6H5)]2 (7) was synthesized and structurally characterized. Both the ortho and meta isomers [Ru(4a)Cl2] (9a) and [Ru(4b)Cl2] (9b)
研究了邻位和间位取代的[(2-二苯基膦基乙基)苯基]甲醇4a和4b对钌(II)的配位性能。为了确保芳烃和束缚的膦两者的配位,合成了不稳定的钌芳烃二聚体[RuCl 2(EtO 2 CC 6 H 5)] 2(7)并对其结构进行了表征。两个邻位和间位异构体的[Ru(图4a)氯2 ](图9a)和的[Ru(图4b)氯2 ](通过X射线晶体学表征9b)。扩展的Hückel计算可以合理地说明,配合物9a和9b中的苄醇官能团对各种P和C亲电试剂缺乏反应性。
Ni-Catalyzed Enantioselective Intramolecular Mizoroki–Heck Reaction for the Synthesis of Phenanthridinone Derivatives
作者:Diana Rachii、Dana J. Caldwell、Yui Kosukegawa、Mary Sexton、Paul R. Rablen、William P. Malachowski
DOI:10.1021/acs.joc.3c00202
日期:2023.7.7
nickel-catalyzed Heck reactions. A wide range of substrates were demonstrated to work in good to excellent yields. Good enantioselectivity was demonstrated using a new synthesized chiral iQuinox-type bidentate ligand (L27). The sustainability, low price of nickel catalysts, and significantly faster reaction rate (1 h) versus that of a recently reported palladium-catalyzedreaction (20 h) make this process