Palladium-catalyzed direct β-arylation of ketones with diaryliodonium salts: a stoichiometric heavy metal-free and user-friendly approach
作者:Zhongxing Huang、Quynh P. Sam、Guangbin Dong
DOI:10.1039/c5sc01636c
日期:——
A user-friendly protocol for the Pd-catalyzed direct [small beta]-arylation of ketones is described, which avoids the use of stoichiometric heavy metals.
Catalytic Direct β-Arylation of Simple Ketones with Aryl Iodides
作者:Zhongxing Huang、Guangbin Dong
DOI:10.1021/ja410389a
日期:2013.11.27
Herein we report a direct β-arylation of simple ketones with widely available aryliodides, combining palladium-catalyzed ketone oxidation, aryl-halide activation, and conjugate addition through a single catalytic cycle. Simple cyclic ketones with different ring-sizes, as well as acyclic ketones, can be directly arylated at the β-position with complete site-selectivity and excellent functional group
Palladium-catalyzed redox cascade for direct β-arylation of ketones
作者:Zhongxing Huang、Guangbin Dong
DOI:10.1016/j.tet.2018.03.017
日期:2018.6
design and development of two palladium-catalyzed redox cascade methods that enable direct β-arylation of ketones. Palladium-catalyzed ketone dehydrogenation, aryl-X bond activation and conjugate addition were merged into a redox-neutral catalytic cycle. Non-metal-based aryl electrophiles were used as both the oxidant and the aryl source. The β-arylation with aryliodides was achieved site-selectively
1,4-Addition of aryl boronic acids to α,β-unsaturated ketones catalyzed by a CCC–NHC pincer rhodium complex
作者:Sean W. Reilly、Hannah K. Box、Glenn R. Kuchenbeiser、Ramel J. Rubio、Christopher S. Letko、Kandarpa D. Cousineau、T. Keith Hollis
DOI:10.1016/j.tetlet.2014.09.107
日期:2014.12
An air- and water-stable CCC–NHC pincer Rh complex catalyzed the 1,4-addition of aryl boronic acids to α,β-unsaturated ketones and aldehydes. This bench top method proceeds in eco-friendly solvents including methanol and water. The scope of boronic acids was expanded to include heterocyclic examples.
hydrotalcite (Rh/HT) was prepared by the treatment of a Mg–Al mixed hydroxide (hydrotalcite, HT) with an aqueous RhCl3·nH2O solution. The formation of the RhIII species on the HT surface was confirmed by X-ray absorption fine structure spectroscopy. The Rh/HT catalyst was demonstrated to effectively promote the 1,4-addition reaction of organoboron reagents to electron-deficient olefins in both organic and aqueous
通过用RhCl 3 · n H 2 O水溶液处理Mg-Al混合氢氧化物(水滑石,HT)来制备铑接枝的水滑石(Rh / HT)。HT表面上Rh III物种的形成通过以下方法得以证实X射线吸收精细结构光谱。Rh / HT催化剂 被证明可以有效地促进有机硼试剂的1,4-加成反应至电子不足 烯烃 无论是有机的还是水性的 溶剂。HT的强表面碱性有助于形成具有高亲核性的Rh-OH物种,从而导致有机硼试剂的有效重金属化。由于Rh / HT表面的双功能性,该催化剂体系还可用于2-氰基3-,3-二苯基丙酸酯的一锅三组分合成。