- N -Arylation of (hetero)arylamines using aryl sulfamates and carbamates via C-O bond activation enabled by a reusable and durable nickel(0) catalyst
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An effective and general aryl amination protocol has been developed using a magnetically recoverable Ni(0) based nanocatalyst. This new stable catalyst was prepared on Fe3O4@SiO2 modified by EDTA and investigated by FT-IR, EDX, TEM, XRD, DLS, FE-SEM, XPS, NMR, TGA, VSM, ICP and elemental analysis techniques. The reaction proceeded via carbon-oxygen bond cleavage of (hetero)aryl carbamates and sulfamates under simple and mild conditions without the use of any external ligands. This method demonstrated functional group tolerance in the N-arylation of various nitrogen-containing compounds as well as aliphatic amines, anilines, pyrroles, pyrazoles, imidazoles, indoles, and indazoles with good to excellent yields. Furthermore, the catalyst could be easily recovered by using an external magnetic field and directly reused at least six times without notable reduction in its activity. This journal is
- Dindarloo Inaloo, Iman,Majnooni, Sahar,Eslahi, Hassan,Esmaeilpour, Mohsen
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p. 13266 - 13278
(2020/10/07)
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- N-(1-Oxy-2-picolyl)oxalamic acids as a new type of O,O-ligands for the Cu-catalyzed N-arylation of azoles with aryl halides in water or organic solvent
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N-(1-Oxy-pyridin-2-ylmethyl)oxalamic acids (L3-L5) were identified as novel efficient ligands for copper-catalyzed C-N cross-coupling of azoles and aryl halides in water. The N-arylation of imidazoles, indoles and pyrazoles proceeded with moderate to excellent yields and complete selectivity over aromatic amines and phenols. Moreover, L5, which is also efficient in organic solvent with low catalyst loading, can be used to promote the N-arylation reactions with water-sensitive materials. The catalytic mechanism was proposed based on the results of several verification experiments which indicated that the ligands as new-type chelators may coordinate to Cu(i) with two oxygen atoms of N-oxide and amide in the coupling process. This journal is
- Wang, Yongbin,Zhang, Yu,Yang, Beibei,Zhang, Ao,Yao, Qizheng
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p. 4101 - 4114
(2015/03/30)
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- An in situ generated CuI/metformin complex as a novel and efficient catalyst for C-N and C-O cross-coupling reactions
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An in situ generated complex of copper(I) and a biguanide, namely metformin, was found to be a highly efficient homogeneous catalyst in N/O-arylation reactions. The O-arylation of substituted phenols with various aryl iodides and bromides was also achieved using this copper catalyst to afford diaryl ethers in good to excellent yields in DMF. This heterogeneous copper catalyst also promotes the N-arylation of imidazole with a variety of aryl halides (Cl, Br, I) in acetonitrile.
- Ghorbani-Vaghei, Ramin,Hemmati, Saba,Veisi, Hojat
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p. 7095 - 7099
(2013/12/04)
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- Efficient use of a surfactant for copper-catalyzed coupling reaction of arylboronic acids with imidazoles in water
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Copper-catalyzed oxidative coupling of arylboronic acids with imidazoles in water was realized by using an amphiphilic surfactant. By choosing an appropriate surfactant, reactions of a variety of arylboronic acids proceeded smoothly under mild and base-fr
- Inamoto, Kiyofumi,Nozawa, Kanako,Kadokawa, Jun,Kondo, Yoshinori
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experimental part
p. 7794 - 7798
(2012/09/22)
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- Highly efficient ci￡n bond forming reactions in water catalyzed by copper(i) iodide with calix[4]arene supported amino acid ionic liquid
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A novel and effective protocol has been developed for the Ullmann-type Ci￡N coupling reaction catalyzed by calix[4]arene supported amino acid ionic liquid and copper(I) iodide in water under microwave irradiation condition. The protocol uses calix[4]arene supported amino acid ionic liquid as double function of the ligand and phase-transfer catalyst, and shows good tolerance in good to excellent yields. A novel and effective protocol has been developed for the Ullmann-type Ci￡N coupling reaction catalyzed by calix[4]arene supported amino acid ionic liquid and copper(I) iodide in water under microwave irradiation condition. The protocol uses calix[4]arene supported amino acid ionic liquid as double function of the ligand and phase-transfer catalyst, and shows good tolerance in good to excellent yields. Copyright
- Huang, Li,Jin, Can,Su, Weike
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p. 2394 - 2400
(2013/01/15)
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- Salts Comprising Aryl-Alkyl-Substituted Imidazolium and Triazolium Cations and the Use Thereof
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The present invention relates to salts comprising novel aryl-alkyl-substituted imidazolium and triazolium cations and arbitrary anions. The invention further relates to methods for the chemical conversion and separation of substances, comprising the salts
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Page/Page column 8-9; 11
(2011/05/08)
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- PH-Responsive chelating N-heterocyclic dicarbene palladium(ii) complexes: Recoverable precatalysts for Suzuki-Miyaura reaction in pure water
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A hydrophobic palladium complex of the chelating N-heterocyclic dicarbene (NHDC) (3) was synthesized through in situ deprotonation of a bisimidazolium salt (2) by Pd(OAc)2 in DMSO, subsequent basic hydrolysis and acidification resulted in the formation of four NHDC palladium complexes bearing carboxylic functional groups (4-7). Complexes 4-7 are air-stable, pH-responsive and water-soluble under basic conditions due to deprotonation of the carboxylic groups. The catalytic activities of the hydrophilic catalytic systems from 4-7 were preliminarily evaluated using the Suzuki-Miyaura cross-coupling reaction in pure water, high catalytic activity and chemical selectivity were observed in comparison with their hydrophobic analogue from 3. Either the catalytic aqueous solution or the pH-responsive catalysts were easily separated and could be recycled at least four times. TEM analysis revealed that Pd(0) nanoparticles were formed after the catalytic reaction.
- Li, Liuyi,Wang, Jinyun,Zhou, Chunshan,Wang, Ruihu,Hong, Maochun
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body text
p. 2071 - 2077
(2011/09/16)
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- Electronic effects of para-substitution on the melting points of TAAILs
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Owing to numerous new applications, the interest in "task- specific" ionic liquids increased significantly over the last decade. But, unfortunately, the imidazolium-based ionic liquids (by far the most frequently used cations) have serious limitations whe
- Schulz, Tobias,Ahrens, Sebastian,Meyer, Dirk,Allolio, Christoph,Peritz, Anke,Strassner, Thomas
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supporting information; experimental part
p. 863 - 867
(2011/10/05)
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- Copper-catalyzed C-N coupling of amides and nitrogen-containing heterocycles in the presence of cesium fluoride
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The copper-catalyzed C-N coupling of amides to aryl halides usually requires the use of strong alkali metal bases, such as K2CO3, K3PO4, and Cs2CO3, at high temperature. We discovered that
- Phillips, Dean P.,Zhu, Xue-Feng,Lau, Thomas L.,He, Xiaohui,Yang, Kunyong,Liu, Hong
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supporting information; experimental part
p. 7293 - 7296
(2010/03/03)
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- Highly functional group tolerance in copper-catalyzed N-arylation of nitrogen-containing heterocycles under mild conditions
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A copper-catalyzed process has been developed for the N-arylation reaction under very mild conditions in the absence of additional ligand. This protocol could not only tolerate an array of thermally sensitive functional groups, but also achieve high chemoselectivity.
- Zhu, Liangbo,Li, Gaocan,Luo, Liang,Guo, Peng,Lan, Jingbo,You, Jingsong
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supporting information; experimental part
p. 2200 - 2202
(2009/07/01)
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- A concept of supported amino acid ionic liquids and their application in metal scavenging and heterogeneous catalysis
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Novel supported task-specific ionic liquids have been developed for the first time via the ionic-pair coupling of imidazolium cation of the modified polystyrene support with L-proline. The materials have shown an efficient metal scavenging ability (e.g., Cul, Pd(OAc)2, Pd0, and IrCl3) without the aid of a nonimmobilized ionic liquid, which relies on the highly synergistic effect of the coordination with the nitrogen atom and the COO- group of the L-proline moiety, electrostatic forces, and steric protection. The resulting metal-soaked supported ionic liquids can be used as efficient heterogeneous catalysts. These materials have been investigated in the Cul-catalyzed N-arylation of nitrogen-containing heterocycles and exhibit much higher catalytic activity and a more extensive structural range of aryl and heteroaryl halides than those exhibited by free L-proline in combination with Cul both in the ionic liquid ([BMIM][BF 4]) and in the corresponding homogeneous reaction conditions. The Cul-soaked catalyst 4a-2 can be recycled for nine runs at least without any considerable loss of activity. To the best of our knowledge, our catalytic process is among the most efficient approaches to the N-arylation of imidazoles with aryl halides so far reported. Furthermore, the Pd-soaked material 4a-2 also shows higher catalytic activity in the solvent-free hydrogenation of styrene to ethylbenzene. This new concept is generally applicable and may easily be extended to other supported task-specific ionic liquids.
- Chen, Wen,Zhang, Yuanyuan,Zhu, Liangbo,Lan, Jingbo,Xie, Rugang,You, Jingsong
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p. 13879 - 13886
(2008/09/16)
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- Simple copper salt-catalyzed N-arylation of nitrogen-containing heterocycles with aryl and heteroaryl halides
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(Chemical Equation Presented) Relatively mild and highly efficient CuI-catalyzed N-arylation procedures for nitrogen-containing heterocycles (e.g., imidazoles, benzimidazoles, pyrroles, pyrazoles, indoles, triazoles, etc.) with aryl and heteroaryl halides have been developed. The protocols can be performed easily and tolerate a number of functional groups, such as ester, nitrile, nitro, ketone, free hydroxyl, and free primary amine on the aryl halide.
- Zhu, Liangbo,Guo, Peng,Li, Gaocan,Lan, Jingbo,Xie, Rugang,You, Jingsong
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p. 8535 - 8538
(2008/03/11)
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- Highly efficient copper-catalyzed N-arylation of nitrogen-containing heterocycles with aryl and heteroaryl halides
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(Chemical Equation Presented) New (S)-pyrrolidinylmethylimidazole ligands (4a-c) have been readily synthesized in a straightforward fashion from least expensive starting materials in short steps in high yields. Relatively mild and highly efficient Cul-catalyzed N-arylation procedures for imidazoles with aryl and heteroaryl bromides or chlorides have been developed in the presence of 4a and Cs2CO3. It is important to note that the protocol could tolerate functional groups such as ester, nitrile, nitro, ketone, free hydroxyl, and free primary amine on the aryl halide. The protocol could also be applicable to other π-electron-rich nitrogen heterocycles (pyrrole, pyrazole, indole, benzimidazole, and triazole), affording the N-arylazoles in good to excellent yields.
- Zhu, Liangbo,Cheng, Liang,Zhang, Yuxi,Xie, Rugang,You, Jingsong
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p. 2737 - 2743
(2008/02/05)
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- Copper-catalyzed N-arylation of imidazoles and benzimidazoles
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(Chemical Equation Presented) 4,7-Dimethoxy-1,10-phenanthroline (L1c) was found to be an efficient ligand for the copper-catalyzed N-arylation of imidazoles and benzimidazoles with both aryl iodides and bromides under mild conditions. Further optimization of the system has revealed that the addition of poly(ethylene glycol) accelerates this reaction. A variety of hindered and functionalized imidazoles, benzimidazoles, and aryl halides were transformed in good to excellent yields. Heteroaryl halides were also coupled in moderate to good yields. We also present the results obtained from a series of coupling reactions, which directly compare the use of L1c with other recently reported ligands.
- Altman, Ryan A.,Koval, Erica D.,Buchwald, Stephen L.
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p. 6190 - 6199
(2008/02/10)
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- 4,7-Dimethoxy-1,10-phenanthroline: An excellent ligand for the Cu-catalyzed N-arylation of imidazoles
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4,7-Dimethoxy-1,10-phenanthroline (L) was found to be an efficient ligand for the copper-catalyzed N-arylation of imidazole with aryl iodides and bromides under mild conditions. A variety of hindered and functionalized imidazoles and aryl halides were transformed in good to excellent yields.
- Altman, Ryan A.,Buchwald, Stephen L.
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p. 2779 - 2782
(2007/10/03)
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- Synthesis, structure and stability of new PtII-bis(N- heterocyclic carbene) complexes
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The use of metal acetates has allowed the synthesis of NHC complexes without isolation of the free carbene. This route is very useful in cases where the metal acetates are readily available and has been used, for example, for the synthesis of bis(N-hetero
- Ahrens, Sebastian,Herdtweck, Eberhardt,Goutal, Sigrid,Strassner, Thomas
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p. 1268 - 1274
(2007/10/03)
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- Sulfonamide derivatives, their production and use
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The present invention provides compounds which specifically inhibit FXa, which are effective when orally administered and which are useful as a safe medicine for the prevention or treatment of diseases caused by thrombus or infarction. Compounds of this invention are piperazinones of the formula: wherein R1is an optionally substituted hydrocarbon group or an optionally substituted heterocyclic group; the ring A is an optionally substituted divalent nitrogen-containing heterocyclic group, in addition to being substituted by the group of the formula: and the group of the formula: Y is an optionally substituted divalent hydrocarbon group or an optionally substituted divalent heterocyclic group; X is a direct bond or an optionally substituted alkylene chain; Z is (1) an amino group substituted with an optionally substituted hydrocarbon group, (2) an optionally substituted imino group or (3) an optionally substituted nitrogen-containing heterocyclic group; provided that when X is a direct bond and Z is an optionally substituted 6-membered nitrogen-containing aromatic heterocyclic group, Y is an optionally substituted divalent hydrocarbon group or an optionally substituted divalent unsaturated heterocyclic group; or a salt thereof.
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Referential example 16
(2010/11/29)
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- N-imidazolyl derivatives of substituted tetrahydrocarbazole and cyclohept (B) indole
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The invention provides new N-imidazolyl derivatives of substituted tetrahydrocarbazoles and cyclopent[b]indoles of general formula (I) STR1 wherein n is 1 or 2; p is an integer of 1 to 4; A is a straight or branched C1 -C4 alkylene c
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- Aromatic hydrazides as specific inhibitors of bovine serum amine oxidase
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New hydrazides were synthesized in search for specific inhibitors of bovine serum amine oxidase: a series of benzoic and phenylacetic acid hydrazides containing the 1H-imidazol-1-yl or the 1H-imidazol-1-ylmethyl group as (o,m,p)-substituent in the phenyl ring; an analogous series of p-substituted phenylhydrazides with 5 or 6-membered heterocyclic ring as substituent, and a series of similar phenylpropionic hydrazides. The longer and more flexible phenylacetic hydrazides, and to a somewhat lesser extent the phenylpropionic ones, were better specific inhibitors of bovine serum amine oxidase than the benzoic hydrazides, which were also bound by the enzyme with high affinity, but at a slow rate. Derivatives with p- and m-substituents were more reactive than the o-substituted ones. The chemical nature of the substituent was less important than its position in the phenyl ring and the presence of methylene spacers. These data point to the presence of a hydrophobic site at short distance from the protein carbonyl cofactor, so that simultaneous interaction of the 2 ends of the inhibitor molecule can occur at the 2 sites. The presence of the hydrophobic site was confirmed by the capability of some molecule deprived of the hydrazidic group to act as mild inhibitors. All hydrazides were less reactive by 2-3 orders of magnitude towards pig kidney diamine oxidase and FAD-dependent monoamine oxidase from rat brain mitochondria, while the other compounds showed similar inhibition power against all proteins. The specificity for the bovine enzyme seems therefore to be related to the concerted action of the 2 moieties of the inhibitor molecule.
- Artico,Silvestri,Stefancich,Avigliano,Di Giulio,Maccarrone,Agostinelli,Mondovi,Morpurgo
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p. 219 - 228
(2007/10/02)
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- Novel N-(3-hydroxy-4-piperidinyl)benzamide derivatives
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Novel N-(3-hydroxy-4-piperidinyl)benzamides and derivatives thereof, said compounds being useful as stimulators of the motility of the gastro-intestinal system.
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