Photosensitizer-free, visible light-mediated recyclable gold-catalyzed cross-coupling of aryldiazonium salts and alkynyltrimethylsilanes
作者:Jiajia Li、Junmin Chen、Hefeng Zhu、Mingzhong Cai
DOI:10.1039/d3nj02853d
日期:——
temperature to afford diverse arylalkynes in moderate to good yields with high functional group tolerance, including aryl halides incompatible with traditional cross-coupling. This new heterogenizedgold(I) catalyst could be easily recovered through a simple centrifugation process and reused at least nine times without any significant drop in its catalytic efficiency.
Cellulose/silica supported Schiff base Pd(II) catalyst for copper-free Sonogashira cross-coupling
作者:Pravin S. Pharande、Pradeep M. Mhaldar、Mayuri V. Patil、Suraj A. Sonawane、Shrikrishna T. Salunke、Dattaprasad M. Pore
DOI:10.1007/s11164-023-05186-1
日期:2024.2
Sonogashira cross-coupling. Varity of functionalized diary acetylene derivatives have been achieved with admirable yields from coupling of aryl halides and phenyl acetylenes. The XRD, SEM and TGA analysis of recycledcatalyst revealed remarkable catalytic activity. The proposed approach exhibits remarkable merits such as impressively low catalyst loading (0.009 mol%), elevated turnover numbers (up to 10
A series of unsymmetrical diarylethynes have been synthesized by the copper-catalyzed cross-coupling reaction of alkynylboronates with aryl iodides in high to excellent yields under palladium-free conditions. A wide range of substrates bearing an electron-donating or an electron-withdrawing substituent on the aromatic ring are compatible with this reaction. (C) 2012 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Decarbonylative Sonogashira Coupling of Terminal Alkynes with Carboxylic Acids
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
A chemo- and stereoselective Pd-catalysed semi-reduction of alkynes to (Z)-alkenes has been performed in a phosphonium-based DES by using the in situ generation of H2 from Al/H2O. The antitumor agent combretastatin A4 has been also synthesized.
通过利用 Al/H2O 原位生成 H2,在膦基 DES 中进行了炔烃到 (Z)- 烯的化学和立体选择性钯催化半还原反应。此外,还合成了抗肿瘤药物考布他丁 A4。