Synthesis of unsymmetrical biaryls via kinetic higher order cyanocuprates: scope, limitations, and spectroscopic insights
作者:Bruce H. Lipshutz、Konstantin Siegmann、Emiliano Garcia、Frank Kayser
DOI:10.1021/ja00073a051
日期:1993.10
Treatment of lower order arylcyanocuprates ArCu(CN)Li with 1 equiv of an aryllithium (Ar'Li) at temperatures around -125 o C leads to higherorder reagents Ar(Ar')Cu(CN)Li 2 . Upon exposure of such reagents at this temperature to ground-state molecular oxygen, good yields of the unsymmetrical biaryl Ar-Ar' can be realized. Several different types of aryl ligands have been examined, including naphthalenes
在 -125 o C 左右的温度下,用 1 当量的芳基锂 (Ar'Li) 处理低级芳基氰铜酸盐 ArCu(CN)Li 会产生高级试剂 Ar(Ar')Cu(CN)Li 2 。在该温度下将此类试剂暴露于基态分子氧后,可以实现不对称联芳基 Ar-Ar' 的良好产率。已经检查了几种不同类型的芳基配体,包括萘,以评估该方法的通用性。已经在 -130 o C 和更高温度下获得了三种不同铜酸盐的光谱数据( 13 C NMR),以确定它们的动力学性质(如合成化学所示)是否可以通过物理方法证实
An efficient catalyst for the synthesis of ortho-substituted biaryls by the Suzuki cross-coupling: Triphenylphosphine adduct of cyclopalladated ferrocenylimine
作者:Hong Li、Yangjie Wu、Weibo Yan
DOI:10.1016/j.jorganchem.2006.09.023
日期:2006.12
The air and moisture stable triphenylphosphine adduct of cyclopalladatedferrocenylimine 2 has been successfully used in palladium-catalyzed Suzuki cross-coupling for the synthesis of ortho-substituted biaryls in air. In the presence of 0.05 mol% of 2 as catalyst and 3 equivalent of CsF as base in dioxane at 100 °C, ortho-substituted biaryls were synthesized with moderate to high yields in the reactions
Controlled ‘decomposition’ of “kinetic” higher order cyanocuprates: A new route to unsymmetrical biaryls
作者:Bruce H. Lipshutz、Konstantin Seigmann、Emiliano Garcia
DOI:10.1016/s0040-4020(01)88522-7
日期:1992.3
(temperature and mode of formation), unprecedented “kinetic” higherordercyanocuprates can be generated. Under oxidative conditins, their chemistry is unique when compared with constitutionally identical reagents formulated in the usual manner. Employing mixed diaryl reagents ArAr′Cu(CN)Li2, prepared from ArLi, Ar′Li, and CuCN, unsymmetrical biaryls (Ar-Ar′) can be realized with remarkable selectivity