Advanced Synthesis and Catalysis

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Solvent‐Free Carbon‐Carbon Bond Formations in Ball Mills
Advanced Synthesis and Catalysis - Tập 349 Số 14-15 - Trang 2213-2233 - 2007
Belén Rodrı́guez, Angelika Bruckmann, Toni Rantanen, Carsten Bolm
AbstractBall milling has been applied in numerous solvent‐free carbon‐carbon bond formations. In many cases, these transformations proved superior to the analogous reactions performed in solution. The reaction scope involves purely organic addition and coupling reactions, transformations involving metals (in stoichiometric and catalytic amounts) as well as asymmetric organocatalyses.
Mild Cobalt(III)‐Catalyzed C–H Hydroarylation of Conjugated C=C/C=O Bonds
Advanced Synthesis and Catalysis - Tập 359 Số 10 - Trang 1717-1724 - 2017
Jie Li, Ziqi Zhao, Wenbo Ma, Mengyao Tang, Dawei Wang, Liang‐Hua Zou
AbstractAn efficient cobalt(III)‐catalyzed C‐2‐selective indole C–H hydroarylation of acrolein, enones, and glyoxylates was achieved under mild reaction conditions. The versatile cobalt(III) catalyst displayed excellent positional selectivity with the assistance of pyrimidinyl, pyridyl, and pyrazolyl directing groups, thus overcoming the inherent C‐3 selectivity of an electrophilic indole derivati... hiện toàn bộ
Rhodium‐Catalyzed CH Olefination of Aryl Weinreb Amides
Advanced Synthesis and Catalysis - Tập 355 Số 9 - Trang 1724-1728 - 2013
Yan Wang, Chao Li, Yan Li, Feng Yin, Xi‐Sheng Wang
AbstractA rhodium(III)‐catalyzed oxidative CH olefination directed by Weinreb amides, a class of well developed versatile building blocks in organic synthesis, has been developed with air as the terminal oxidant. The reactions proceed with excellent reactivity, good functional group tolerance and high yields.
Rhodium(III)‐Catalyzed Oxidative Olefination of Picolinamides: Convenient Synthesis of 3‐Alkenylpicolinamides
Advanced Synthesis and Catalysis - Tập 356 Số 5 - Trang 1038-1046 - 2014
Jun Zhou, Bo Li, Zhenchao Qian, Bing‐Feng Shi
AbstractA rhodium(III)‐catalyzed selective olefination of picolinamide derivatives has been developed. The reaction shows high regioselectivity, low catalyst loading (0.5 mol%), high yield and good functional group tolerance, providing a convenient strategy for the synthesis of 3‐alkenylpicolinamides.magnified image
Ester‐Directed Selective Olefination of Acrylates by Rhodium Catalysis
Advanced Synthesis and Catalysis - Tập 356 Số 7 - Trang 1501-1508 - 2014
Ruokun Feng, Wenlong Yu, Kai Wang, Zhanxiang Liu, Yuhong Zhang
AbstractEster‐directed olefination of acrylates via rhodium(III)‐catalysis was developed. Various alkenes were reacted with acrylates to give the desired products in high stereoselectivity. Mechanistic investigations revealed that ester‐directed CH bond activation was the key step to this reaction.magnified image
Palladium(0) Nanoparticles on Glass‐Polymer Composite Materials as Recyclable Catalysts: A Comparison Study on their Use in Batch and Continuous Flow Processes
Advanced Synthesis and Catalysis - Tập 350 Số 5 - Trang 717-730 - 2008
Klaas Mennecke, R. Cecilia, Toma N. Glasnov, S. Gruhl, Carla Vogt, Armin Feldhoff, M.Á. Larrubia, C. Oliver Kappe, Ulrich Kunz, Andreas Kirschning
AbstractPalladium particles were generated by reduction of palladate anions bound to an ion exchange resin inside microreactors. The size and distribution of the palladium particles differed substantially depending on the degree of cross‐linking and the density of ion exchange sites on the polymer/glass composites, the latter parameter having a larger influence than the former. The polymer phase o... hiện toàn bộ
Nanocrystalline Magnesium Oxide‐Stabilized Palladium(0): An Efficient and Reusable Catalyst for Suzuki and Stille Cross‐Coupling of Aryl Halides
Advanced Synthesis and Catalysis - Tập 347 Số 15 - Trang 2002-2008 - 2005
M. Lakshmi Kantam, Sarabindu Roy, Moumita Roy, B. Sreedhar, B. M. Choudary
AbstractA nanocrystalline magnesium oxide‐stabilized palladium(0) catalyst is prepared by counterion stabilization of PdCl42− with nanocrystalline MgO followed by reduction. This ligand‐free heterogeneous nanocrystalline MgO‐stabilized nanopalladium [NAPMgPd(0)] catalyst using the basic MgO in place of basic ligands exhibits excellent activity in Suzuki and Stille cross‐coupling of haloarenes (c... hiện toàn bộ
Palladium‐Catalyzed Oxidative Heck‐Type Allylation of β,β‐Disubstituted Enones with Allyl Carbonates
Advanced Synthesis and Catalysis - Tập 356 Số 9 - Trang 2097-2102 - 2014
Weiwei Jin, Qin Yang, Ping Wu, Jiping Chen, Zhengkun Yu
AbstractThe palladium‐catalyzed oxidative Heck‐type allylation of β,β‐disubstituted enones, i.e., α‐oxoketene dithioacetals, was efficiently realized with allyl carbonates, providing a concise route to highly functionalized dienes. The present synthetic methodology utilizes the substrate activation strategy to activate the CH bond of β,β‐disubstituted enones by introduction of a 1,2‐dithiolane fu... hiện toàn bộ
Synthesis of Aryl Thiocyanates and Aryl Selenocyanates via Visible‐Light Activation of Arylazo Sulfones
Advanced Synthesis and Catalysis - - 2023
Yu Gao, Sara Sparascio, Lorenzo Di Terlizzi, Massimo Serra, Guanglu Yue, Yaru Lu, Maurizio Fagnoni, Xia Zhao, Stefano Protti
AbstractTwo visible‐light mediated protocols (based on a copper photoredox catalyzed and on a photochemical reaction, respectively) for the preparation of aryl thiocyanates and aryl selenocyanates from arylazo sulfones are presented herein, by exploiting the peculiar photoreactivity and redox activity of such substrates. The developed reactions take place in good to satisfactory yields and with a ... hiện toàn bộ
Mechanistic Studies of SCS-Pd Complexes Used in Heck Catalysis
Advanced Synthesis and Catalysis - Tập 347 Số 1 - Trang 172-184 - 2005
David E. Bergbreiter, Philip L. Osburn, J.D. Frels
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