Using Anilines as Masked Cross-Coupling Partners: Design of a Telescoped Three-Step Flow Diazotization, Iododediazotization, Cross-Coupling Process
作者:Matthieu Teci、Michael Tilley、Michael A. McGuire、Michael G. Organ
DOI:10.1002/chem.201603626
日期:2016.11.21
diazotization/iododediazotization/cross‐coupling process. The segmented flow stream created by off‐gassing during the Sandmeyer sequence was restored to a continuous column of reaction solution by using a specially designed continuous‐flow unit controlled by custom software created in‐house. The resultant aryliodide was then combined with a stream of cross‐coupling solution that fed into the final reactor. The system
Electrochemical Proton Reduction over Nickel Foam for
<i>Z</i>
‐Stereoselective Semihydrogenation/deuteration of Functionalized Alkynes
作者:Alejandro Valiente、Pablo Martínez‐Pardo、Gurpreet Kaur、Magnus J. Johansson、Belén Martín‐Matute
DOI:10.1002/cssc.202102221
日期:2022.1.10
Foam catalyst: Commercially available nickel foam is an excellent catalyst for the electrochemical semihydrogenation/semideuteration of functionalized alkynes in diluted sulfuric acid under ambient conditions. Here, the applicability of this catalyst for the stereoselective synthesis of Z-alkenes and Z-alkenes-d2 is presented. The nickel foam is recyclable up to 14 times without losing its catalytic
Nano palladium supported on high-surface-area metal-organic framework MIL-101: an efficient catalyst for Sonogashira coupling of aryl and heteroaryl bromides with alkynes
作者:Manne Annapurna、T. Parsharamulu、P. Vishnuvardhan Reddy、M. Suresh、Pravin R. Likhar、Mannepalli Lakshmi Kantam
A robust and general protocol for a sustainable copper‐free Sonogashira cross coupling under micellar aqueous reaction conditions with high turnover was developed. By using the commercially available catalyst CataCXium A Pd G3 and THF as co‐solvent, various alkyne substrates were efficiently cross‐coupled with a broad range of aryl halides, providing improved yields and low catalyst loadings. The reaction
为在胶束水相反应条件下以高周转率实现可持续的无铜Sonogashira交叉偶联,开发了一种可靠且通用的方案。通过使用市售的催化剂CataCXium A Pd G3和THF作为助溶剂,各种炔烃底物可以与多种芳基卤化物有效地交叉偶联,从而提高了收率并降低了催化剂的负载量。对反应参数进行了优化,以使该过程操作简单,可靠且可扩展。该方法可通过胶束水溶液反应条件获得二卤代底物的烷基化芳烃,杂环化合物和单官能化产物,并具有提高的选择性。
Transition-metal-catalyzed carbon-nitrogen and carbon-carbon bond-forming reactions
申请人:Buchwald L. Stephen
公开号:US20060173186A1
公开(公告)日:2006-08-03
One aspect of the present invention relates to ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in various transition-metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition-metal-catalyzed reactions, including the range of suitable substrates, number of catalyst turnovers, reaction conditions, and efficiency. For example, improvements have been realized in transition metal-catalyzed: aryl amination reactions; aryl amidation reactions; Suzuki couplings; and Sonogashira couplings. In certain embodiments, the invention relates to catalysts and methods of using them that operate in aqueous solvent systems.