Practical three-component synthesis of crowded arenes with donor–acceptor substitution
作者:Robert Fichtler、Jörg-M. Neudörfl、Axel Jacobi von Wangelin
DOI:10.1039/c1ob05984j
日期:——
An operationally simple two-step synthesis of substituted anilides has been developed. The methodology utilizes carboxamides, aldehydes, and olefins (or alkynes) as cheap starting materials and relies upon the sequential combination of condensation, cycloaddition, and oxidation reactions. The intermediate cycloadducts display various functional groups (e.g. Br, OAc, NR2, COR, Cbz) for further chemical
Novel Schiff bases were synthesized by condensing aromatic amines with pyridoxal-5’-phosphate and characterized by using FT-IR, 1H NMR, and 13C NMR spectroscopic techniques. The resulting Schiff bases were utilized as bidentate ligands, coordinating via imine nitrogen and phenolate oxygen atoms, to stabilize palladium ions. Aryl substituents on imine nitrogen allowed for fine tuning of the stereoelectronic
通过将芳族胺与吡ido醛-5'-磷酸缩合来合成新型席夫碱,并使用FT-IR,1 H NMR和13 C NMR光谱技术进行表征。生成的席夫碱被用作二齿配体,通过亚胺氮和酚盐的氧原子进行配位,以稳定钯离子。亚胺氮上的芳基取代基可微调席夫碱的立体电子性质。在H 2 O / EtOH(1:1)中,一系列芳基卤化物与硼酸的Suzuki交叉偶联反应中研究了所选钯配合物的催化活性。在交叉偶联反应中研究的四种配合物中,Pd(L 8)2芳基亚胺上带有甲氧基取代基的,在低催化剂负载下显示出最高的活性。还用26个样品研究了反应的范围。
Synthesis of Biaryls via Pd-Catalyzed Decarboxylative Coupling of Substituted Benzoic Acids with Phenylboronic Acids
Abstract A Pd-catalyzed decarboxylativecoupling of substituted benzoic acids with phenylboronic acid has been developed. Under the optimized conditions, a variety of substituted benzoic acids were found to undergo decarboxylativecoupling with various phenylboronic acids to give the desired unsymmetrical biaryls in good yields. [Supplementary materials are available for this article. Go to the publisher's
Synthesis of Biaryls by Decarboxylative Hiyama Coupling
作者:Dmitry Katayev、Benjamin Exner、Lukas J. Gooßen
DOI:10.1002/cctc.201500068
日期:2015.7.13
A trimetallic palladium/copper/silver system has been developed that allows the decarboxylativeHiyamacoupling of ortho‐substituted aryl carboxylates with trialkoxyarylsilanes to give the corresponding biaryls. The cross‐coupling is catalyzed by a Pd/N‐heterocyclic carbene complex with silver carbonate aiding its reoxidation. Copper(II) fluoride acts as decarboxylation catalyst, stoichiometric oxidant
Compounds effective in inhibiting replication of Hepatitis C virus (“HCV”) or other viruses are disclosed. This invention is also directed to compositions comprising such compounds, co-formulation or co-administration of such compounds with other anti-viral or therapeutic agents, processes and intermediates for the syntheses of such compounds, and methods of using such compounds for the treatment of HCV or other viral infections.