开发用于环境友好的有机转化的催化剂是一个非常活跃的研究领域。迄今为止报道的大多数催化剂都是基于过渡金属配合物。近年来,已经报道了由主族金属化合物催化的例子。在此,我们报告了一系列镁钳配合物,并通过 NMR 和 X 射线单晶衍射对其进行了表征。研究了通过芳构化/脱芳构化金属-配体合作对 H 2的可逆活化。利用所获得的配合物,在无碱条件下证明了前所未有的均相主族金属催化炔烃的半氢化和烯烃的氢化,得到Z-烯烃和烷烃分别作为产物,具有优异的收率和选择性。对照实验和 DFT 研究揭示了金属-配体合作参与氢化反应。该研究不仅为镁催化的炔烃半加氢和烯烃加氢提供了新途径,而且为主族金属配合物催化的其他化合物加氢提供了机会。
Cross-Coupling of Alkynylsilanols with Aryl Halides Promoted by Potassium Trimethylsilanolate
摘要:
The palladium-catalyzed cross-coupling of aliphatic alkynylsilanols with aryl iodides has been demonstrated with potassium trimethylsilanolate as the coupling promoter and copper(I) iodide as a cocatalyst. The cross-coupling proceeds at room temperature in good to excellent yield with a range of aryl iodides. A comparison of the reactivity of alkynylsilanols, trimethylsilylalkynes, and terminal alkynes under fluoride and fluoride-free conditions was per-formed to elucidate the role of silicon in the Sonogashira reaction.
decarbonylative Sonogashira coupling of terminalalkynes with carboxylic acids was achieved through palladium catalysis. This reaction did not use overstoichiometric oxidants, thus overcoming the homocoupling issue of terminalalkynes. Under the reaction conditions, a wide range of carboxylic acids including those bioactive ones could couple readily with various terminalalkynes, thus providing a relative general
Palladium-Catalyzed Decarboxylative Coupling of Alkynyl Carboxylic Acids and Aryl Halides
作者:Jeongju Moon、Mihee Jang、Sunwoo Lee
DOI:10.1021/jo802290r
日期:2009.2.6
2-Octynoic acid and phenylpropiolic acid were employed for the palladium-catalyzed decarboxylative coupling reaction and with a variety of arylhalides. The former needed 1,4-bis(diphenylphosphino)butane (dppb) as a ligand and the latter tri-tert-butylphosphine (PtBu3), and both required 2 equiv of tetra-n-butylammonium fluoride (TBAF) for full conversion. These reactions showed high reactivities and
Palladium-Catalyzed Sonogashira Coupling of Aryl Mesylates and Tosylates
作者:Pui Ying Choy、Wing Kin Chow、Chau Ming So、Chak Po Lau、Fuk Yee Kwong
DOI:10.1002/chem.201001269
日期:2010.9.3
Up to speed: The first general and mild protocol for the Sonogashiracoupling of aryl mesylates is presented (see scheme). The coupling intermediate also provides facile access to 2‐substituted isoquinolines.
Cross-combination of magnesium diacetylenides with organic halides catalyzed by transition metals complexes
作者:U. M. Dzhemilev、R. A. Saraev、E. M. Vyrypaev、A. G. Ibragimov
DOI:10.1007/bf00958338
日期:1987.9
Efficient Copper-Free PdCl<sub>2</sub>(PCy<sub>3</sub>)<sub>2</sub>-Catalyzed Sonogashira Coupling of Aryl Chlorides with Terminal Alkynes
作者:Chenyi Yi、Ruimao Hua
DOI:10.1021/jo0525175
日期:2006.3.1
[GRAPHICS]Under copper-free conditions and with Cs2CO3 as a base, PdCl2(PCy3)(2) showed high catalytic activity for cross-coupling of electron-rich, electron-neutral, and electron-deficient aryl chlorides with a variety of terminal alkynes in DMSO at 100-120 degrees C affording internal arylated alkynes in good to excellent yields.