Cross-Coupling Reactions of Aryl Halides with Amines, Phenols, and Thiols Catalyzed by an N,N′-Dioxide-Copper(I) Catalytic System
作者:Haitao Yang、Chao Xi、Zhiwei Miao、Ruyu Chen
DOI:10.1002/ejoc.201100274
日期:2011.6
reactions of various N, O, and S nucleophilic reagents with aryl halides have been successfully carried out under mild conditions by using a novel chiral N,N′-dioxide–copper(I) catalytic system as the catalyst. This versatile and efficient catalyst system has been demonstrated to facilitate the cross-coupling reactions of aryl halides with amines,phenols, and thiols to afford the corresponding desired
通过使用新型手性 N,N'-二氧化物-铜 (I) 催化体系作为催化剂,各种 N、O 和 S 亲核试剂与芳基卤化物的偶联反应已在温和条件下成功进行。这种多功能且高效的催化剂体系已被证明可促进芳基卤化物与胺、酚和硫醇的交叉偶联反应,从而以良好至极好的收率提供相应的所需产物。
Regioselective Synthesis of 1,5-Diaryl-1<i>H</i>-imidazoles by Palladium-Catalyzed Direct Arylation of 1-Aryl-1<i>H</i>-imidazoles
作者:Fabio Bellina、Silvia Cauteruccio、Luisa Mannina、Renzo Rossi、Stéphane Viel
DOI:10.1021/jo050274a
日期:2005.5.1
A variety of 1,5-diaryl-1H-imidazoles have been regioselectively synthesized by direct coupling of 1-aryl-1H-imidazoles with aryl iodides or bromides in DMF in the presence of CsF as the base and a catalyst precursor consisting of a mixture of Pd(OAc)2 and AsPh3. The data obtained in this synthetic study support a reaction mechanism involving an electrophilic attack of an arylpalladium(II) halide species
Dimetallic Palladium‐NHC Complexes: Synthesis, Characterization, and Catalytic Application for Direct C−H Arylation Reaction of Heteroaromatics with Aryl Chlorides
作者:Jhen‐Yi Lee、Debalina Ghosh、Ya‐Ting Kuo、Hon Man Lee
DOI:10.1002/adsc.201901189
日期:2020.2.6
A series of dimetallic palladium(II)‐NHC complexes comprised of 1,4‐naphthalenyl or 9,10‐anthracenyl spacer sandwiched between two imidazole rings was successfully synthesized. These complexes were characterized by 1H and 13C1H} NMR spectroscopy and elemental analysis. The structures of two dimetallic palladium complexes and a related mononuclear palladium complex to be used for comparative studies
成功合成了一系列由1,4-萘基或9,10-蒽基间隔基夹在两个咪唑环之间的双金属钯(II)-NHC配合物。这些配合物的特征在于1 H和13 C 1 H} NMR光谱法和元素分析。X射线衍射进一步表征了用于比较研究的两种双金属钯配合物和一个相关的单核钯配合物的结构。具有9,10-蒽基连接基的双金属钯配合物在催化杂芳族化合物(咪唑,咪唑[1,2- a]吡啶和噻唑)与各种芳基氯化物,使用1.5摩尔%的中等单钯负载量。它允许有效地使用芳基氯化物来制备芳基化的杂环,以前只能与反应性较强的溴化物对应物接触。重要的是,发现双金属预催化剂的催化活性高于类似的单核配合物。
Salen complex of Cu(II) supported on superparamagnetic Fe3O4@SiO2 nanoparticles: an efficient and magnetically recoverable catalyst for N-arylation of imidazole with aryl halides
economical, and magnetically recoverable heterogeneouscatalyst for the selective and efficient N-(hetero)arylation of imidazole. Only by adding a small amount of the catalyst (0.4 mol% Cu) to the reactants and heating under air, the new presented method provides a variety of functionalized and hindered N-(hetero)arylimidazoles in good to excellent yields within short reaction times. The catalyst could be
摘要据报道,Fe 3 O 4 @SiO 2 / Salen-Cu(II)纳米催化剂是一种热和空气稳定,经济,可磁回收的非均相催化剂,用于咪唑的选择性和有效的N-(杂)芳基化。仅通过向反应物中添加少量催化剂(0.4 mol%Cu)并在空气中加热,新提出的方法即可提供多种功能化和受阻的氮-(杂)芳基咪唑在较短的反应时间内即可获得良好至极好的收率。借助永磁体可以很容易地回收催化剂,并且可以连续使用多达五次而又不会明显丧失活性。而且,在第五次循环之后,铜的浸出量可以忽略不计。特别地,使用(杂)芳基碘化物或溴化物作为芳基化剂,并且仅需要少量的可磁回收的非均相铜基纳米催化剂使该方法低成本,对环境无害且易于使用。 图形概要
Commercial drug norfloxacin as a novel ligand for the copper‐catalyzed N‐arylation of imidazole with aryl halides
Norfloxacin was used as an efficient ligand for the CuBr‐catalyzed C‐N coupling reaction of imidazole and arylhalides. The protocol presented good functional group compatibility, permitting many arylhalides to react with imidazole to form the desired products in good to excellent yields.