2-(1-Benzotriazolyl)pyridine: A Robust Bidentate Ligand for the Palladium-Catalyzed CC (Suzuki, Heck, Fujiwara-Moritani, Sonogashira), CN and CS Coupling Reactions
作者:Akhilesh K. Verma、Rajeev R. Jha、Ritu Chaudhary、Rakesh K. Tiwari、Abhinandan K. Danodia
DOI:10.1002/adsc.201200583
日期:2013.2.1
designed and employed for the palladium-catalyzed CC (Suzuki, Heck, Fujiwara–Moritani, and Sonogashira), CN and CS coupling reactions. The ligand was found to be inexpensive, thermally stable, easy to synthesize from easily accessible starting materials on a multigram scale, show simplicity in use, and robustness in application, making this ligand effective for different coupling reactions. Suitably, the
设计了一种新型的双齿配体1-(吡啶-2-基)-1 H-苯并[ d ] [1,2,3]三唑,并用于钯催化的CC(Suzuki,Heck,Fujiwara– Moritani和Sonogashira),CN和CS偶联反应。发现该配体便宜,热稳定,易于以几克规模由容易获得的起始原料合成,显示出使用简单性和在应用中的坚固性,从而使该配体对于不同的偶联反应有效。适当地,苯并三唑环的NN键的供体能力和吡啶环的N上的孤对电子增强了配体的二齿能力。
l-(+)-Tartaric acid and choline chloride based deep eutectic solvent: An efficient and reusable medium for synthesis of N-substituted pyrroles via Clauson-Kaas reaction
作者:Ping Wang、Fei-Ping Ma、Zhan-Hui Zhang
DOI:10.1016/j.molliq.2014.07.015
日期:2014.10
l-(+)-Tartaric acid–choline chloride based deep eutectic solvent has been found to be an effective promoted medium for Clauson-Kaas reaction of aromatic amines and 2,5-dimethoxytetrahydrofuran. Structurally diverse N-substituted pyrroles were obtained in high to excellent yields under mild conditions. The deep eutectic solvent is inexpensive, non-toxic, reusable and biodegradable.
reaction for N-substituted pyrrole synthesis using 2,5-dimethoxytetrahydrofuran with variously substituted aromatic amines has been developed (up to 89% yield). This interesting neat strategy is free from additives including co-catalysts, ligands, and acids. Relatively low cost, environmentally benign, and handy Mn(NO3)2·4H2O is employed as the catalyst undermicrowave conditions with a very short reaction
Palladium-Catalyzed Direct Synthesis of Phosphole Derivatives from Triarylphosphines through Cleavage of Carbon-Hydrogen and Carbon-Phosphorus Bonds
作者:Katsuaki Baba、Mamoru Tobisu、Naoto Chatani
DOI:10.1002/anie.201307115
日期:2013.11.4
(Phosp)hole in one: A palladium‐catalyzed synthesis for directly assembling phosphole skeletons fromtriarylphosphinesthrough CH and CP bond cleavage was developed. This approach overcomes several of the limitations of the so far reported methods. Phospholes bearing a range of functionalities (including Br, F, CO2Me, Ac, and CN) and an array of fused rings (naphthalenes, anthracenes, furans, and
在一个(Phosp)孔:一个钯催化合成的用于从至C三芳基膦直接组装磷杂环骨架 H和13 C P键裂解被开发。这种方法克服了迄今为止报道的方法的一些局限性。可以容易地合成具有一系列功能性(包括Br,F,CO 2 Me,Ac和CN)的磷脂和一系列稠环(萘,蒽,呋喃和吡咯)。
Palladium-Catalyzed Cyclocoupling of 2-Halobiaryls with Isocyanides via the Cleavage of Carbon−Hydrogen Bonds
2-halobiaryls with isocyanides was developed. The reaction afforded an array of fluorenone imine derivatives via the cleavage of a C−H bond at the 2′-position of 2-halobiaryls. The use of 2,6-disubstitutedphenyl isocyanide was crucial for this catalytic cyclocoupling reaction to proceed. The reaction was applicable to heterocyclic and vinylic substrates, allowing the construction of a wide range of
为了证明异氰化物在催化CH键官能化反应中的实用性,开发了2-卤代双芳基与异氰化物的钯催化的环偶联反应。该反应通过在2-卤代联芳基的2'-位上的CH键断裂,提供了一系列芴酮亚胺衍生物。2,6-二取代的苯基异氰化物的使用对于进行该催化环偶联反应至关重要。该反应适用于杂环和乙烯基底物,从而允许构建广泛的环系统。观察到的大的动力学同位素效应(k H / k D = 5.3)表明,CH键的活化是该催化作用中的周转限制步骤。