31121-09-2Relevant articles and documents
Cellulose sulfate: An efficient heterogeneous catalyst for the ring-opening of epoxides with alcohols and anilines
Chaudhary, Pooja,Deepa,Meena, Dhan Raj,Aalam, Mohd Jubair,Yadav, Geeta Devi,Singh, Surendra
supporting information, p. 1834 - 1846 (2021/05/10)
Cellulose sulfate was synthesized by esterification of α-cellulose with concentrated sulfuric acid at ?10°C in ethanol. Cellulose is mainly sulfated on 3-, 6- and 3, 6-positions of the cellulose. It acts as a heterogeneous catalyst for the ring-opening of epoxides with alcohols or anilines and the Friedel-Crafts reaction between N-benzylindole and crotonaldehyde at room temperature. Methanolysis of cyclic epoxides, styrene oxide, terminal aliphatic epoxides, and glycidyl ethers were carried out using the catalyst (0.4–6.8 mg/mmol of epoxide) and afforded the corresponding products in 53–97% isolated yields after 10 min–24 h. Cellulose sulfate was successfully recycled and reused up to 3 catalytic cycles for the ring-opening of styrene oxide with methanol.
STRONGLY LEWIS ACIDIC METAL-ORGANIC FRAMEWORKS FOR CONTINUOUS FLOW CATALYSIS
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Paragraph 0214-0215; 0239; 0249, (2021/02/26)
Lewis acidic metal-organic framework (MOF) materials comprising triflate-coordinated metal nodes are described. The materials can be used as heterogenous catalysts in a wide range of organic group transformations, including Diels-Alder reactions, epoxide-ring opening reactions, Friedel-Crafts acylation reactions and alkene hydroalkoxylation reactions. The MOFs can also be prepared with metallated organic bridging ligands to provide heterogenous catalysts for tandem reactions and/or prepared as composites with support particles for use in columns of continuous flow reactor systems. Methods of preparing and using the MOF materials and their composites are also described.
Tb2(WO4)3@N-GQDs-FA as an efficient nanocatalyst for the efficient synthesis of β-aminoalcohols in aqueous solution
Azizi, Sajjad,Darroudi, Mahdieh,Soleymani, Jafar,Shadjou, Nasrin
, (2021/02/12)
In the current study, Tb2(WO4)3@N-(GQDs) modified with folic acid (FA) was synthesized during the chemical reaction of terbium (III) tungstate nanoparticles with nitrogen doped graphene quantum dots (N-GQDs) and introduced
M-Type SrFe12O19Ferrite: An Efficient Catalyst for the Synthesis of Amino Alcohols under Solvent-Free Conditions
Laayati, Mouhsine,Hasnaoui, Ali,Abdallah, Nayad,Oubaassine, Saadia,Fkhar, Lahcen,Mounkachi, Omar,El Houssame, Soufiane,Ait Ali, Mustapha,El Firdoussi, Larbi
, (2020/08/05)
Magnetically separable strontium hexaferrite SrFe12O19 was prepared using the chemical coprecipitation method, and the nanostructured material was characterized by X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and BET analysis. The SEM images showed the homogeneity of the chemical composition of SrFe12O19 and uniform distribution of size and morphology. The pore size of the nanomaterial and its specific area were determined by BET measurements. Strontium hexaferrite SrFe12O19 exhibited a strong magnetic field, which is highly suitable in the heterogeneous catalysis as it can be efficiently separated from the reaction. The magnetic nanocatalyst showed high activity and environmentally benign heterogeneous catalysts for the epoxide ring-opening with amines affording β-amino alcohols under solvent-free conditions. When unsymmetrical epoxides were treated in the presence of aromatics amines, the regioselectivity was influenced by the electronic and steric factors. Total regioselectivity was observed for the reactions performed with aliphatic amines. The magnetically SrFe12O19 nanocatalyst showed excellent recyclability with continuously good catalytic activities after four cycles.
Highly regioselective ring-opening of epoxides with amines: A metal- A nd solvent-free protocol for the synthesis of β-amino alcohols
Li, Dong,Wang, Jing,Yu, Shibo,Ye, Silei,Zou, Wenjie,Zhang, Hongbin,Chen, Jingbo
supporting information, p. 2256 - 2259 (2020/03/04)
We herein report a metal- A nd solvent-free acetic acid-mediated ring-opening reaction of epoxides with amines. This process provides β-amino alcohols in high yields with excellent regioselectivity. Importantly, this epoxide ring-opening protocol can be used for the introduction of amines in natural products during late-stage transformations.
Reaction Mechanism of CO2and Styrene Oxide Catalyzed by Ionic Liquids: A Combined DFT Calculation and Experimental Study
Chen, Jian,Ding, Tong,Gao, Guohua,Wang, Rong,Xia, Fei,Zha, Jinyin
, p. 7991 - 7998 (2020/11/27)
Bioactive compound 3-aryl-2-oxazolidinone could be synthesized by a green method mixing carbon dioxide, aniline, and ethylene oxide. Our group previously proposed a parallel mechanism for this conversion catalyzed by ionic liquids. Recently, a new study o
X-ray structurally characterized Mo (VI), Fe (III) and Cu (II) complexes of amide-imine conjugate: (bio)catalytic and histidine recognition studies
Ta, Sabyasachi,Ghosh, Milan,Salam, Noor,Das, Jayanta,Islam, Manirul,Brand?o, Paula,Félix, Vítor,Sanmartin, Jesus,Das, Debasis
, (2020/07/13)
An amide-imine conjugate, (E)-N′-((2-hydroxybenzen-1-yl) methylene)-4-methylbenzohydrazide (H2LPTASAL), derived from 4-methyl-benzoic acid hydrazide (PTA) and 2-hydroxybenzaldehyde is used to prepare Mo (VI), Cu (II) and Fe (III) complexes. The X-ray structurally characterized complexes have been explored as catalyst for amine assisted asymmetric ring opening (ARO) of epoxide, carbon-heteroatom cross-coupling and ethyl benzene oxidation. In addition, their catecholase like activities have thoroughly been investigated. Moreover, the Cu (II) complex selectively recognizes histidine by fluorescence spectroscopy.
Ru-g-C3N4as a highly active heterogeneous catalyst for transfer hydrogenation of α-keto amide into β-aminol or α-hydroxyl amide
Bhanage, Bhalchandra M.,Chaurasia, Shivkumar R.,Mishra, Ashish A.
, p. 10578 - 10585 (2020/07/14)
This work reports a sustainable route for the catalytic transfer hydrogenation (CTH) of α-keto amide into β-aminol via an efficient heterogeneous catalyst wherein ruthenium is incorporated on an active graphite sheet of a carbon nitride support (Ru-g-C3N4). Other different metals like Ni or Pd were also screened with the same support but none of them showed efficient activity. Although, partial hydrogenation of ketone to alcohol has also been observed based on the optimization of the reaction parameters using all of the above catalysts. The catalyst has been characterized using field emission gun scanning electron microscopy (FEG-SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), infra-red (IR) spectroscopy and thermogravimetric analysis (TGA). Furthermore, the catalyst has been recycled and further characterized and does not show any significant changes in its reactivity for the CTH process. Ru-g-C3N4 as a recyclable heterogenous catalyst has been used for the first time for the CTH of α-keto amide into β-aminol, making the process sustainable because economical and environmentally benign isopropyl alcohol is used as a solvent system. The proposed catalytic system shows a wide scope of substrates for α-hydroxyamide and β-aminol derivatives, which were confirmed from 1H and 13C-NMR. This journal is
Synthesis of 1,2-amino alcohols by decarboxylative coupling of amino acid derived α-amino radicals to carbonyl compounds: Via visible-light photocatalyst in water
Pan, Shulei,Jiang, Min,Hu, Jinjin,Xu, Ruigang,Zeng, Xiaofei,Zhong, Guofu
supporting information, p. 336 - 341 (2020/02/13)
A general and efficient visible-light photoredox-catalysed decarboxylative radical coupling reaction of N-aryl amino acids with aldehydes or ketones for the synthesis of various 1,2-amino alcohols by using water as the solvent at room temperature is described. This protocol is characterised by broad substrate scopes, mild reaction conditions and amenability to gram-scale synthesis, which opens up a simple, mild but effective method to produce 1,2-amino alcohols from readily available starting materials.
Synthesis, structure, and catalytic performance of heterobimetallic coordination polymers with β-diketone containing imidazole group
Huang, Yan,Yang, Ping
, p. 47 - 54 (2018/11/21)
Four heterobimetallic coordination polymers [Cd[Al(L)3]2(NO3)2 (1), Zn[Al(L)3]2(NO3)2 (2), Zn[Fe(L)3]2(NO3)2 (3), and [ZnFe
