Application of two magnetic nanoparticle-supported copper(I) catalysts for the synthesis of triazole derivatives
作者:Leila Mohammadi、Mohammad Ali Zolifgol、Meysam Yarie、Mahsa Ebrahiminia、Kenneth P. Roberts、Syed R. Hussaini
DOI:10.1007/s11164-019-03864-7
日期:2019.10
Catalytic performance of two magnetically recoverable copper(I) complexes is reported for the synthesis of 1,2,3-triazole derivatives. Boronic acids and alkyl halides, in the presence of either catalyst, react with terminal alkynes and NaN3, forming 1,2,3-triazole derivatives in good yields. Both catalysts are easily recoverable and show a high potential of reusability.
Synthesis of nanomagnetic supported thiourea-copper(I) catalyst and its application in the synthesis of triazoles and benzamides
作者:Leila Mohammadi、Mohammad Ali Zolfigol、Ardeshir Khazaei、Meysam Yarie、Samira Ansari、Saeid Azizian、Maryam Khosravi
DOI:10.1002/aoc.3933
日期:2018.1
A novel nanomagnetic supported thiourea–copper(I) complex and inorganic–organic Takemoto‐like hybrid nanomagnetic catalyst was designed, and synthesized. The prepared naomagnetic catalyst was characterized using Fourier transform infrared spectroscopy, X‐ray diffraction, energy‐dispersive X‐ray analysis, transmission and scanning electron microscopies, thermogravimetry, nitrogen adsorption/desorption
Dendrimer-encapsulated copper(II) immobilized on Fe3O4@SiO2 NPs: a robust recoverable catalyst for click synthesis of 1,2,3-triazole derivatives in water under mild conditions
In this paper, we have introduced Fe3O4@SiO2-dendrimer-encapsulated Cu(II) as a heterogeneous reusable catalyst for Cu-catalyzed azide-alkyne cycloaddition (CuAAC) reaction in good to excellent yields at ambient temperature in water without requiring ligands, reducing agents and bases. This present methodology is a clean, and environmentally friendly approach that offers many advantages including excellent yields, operational simplicity, short reaction time, and absence of any tedious workup or purification. Moreover, of interesting features are the stability of the catalyst toward leaching and the possibility of catalyst recycling without any significant loss of activity. In this paper, we have introduced Fe3O4@SiO2-dendrimer-encapsulated Cu(II) as a heterogeneous reusable catalyst for Cu-catalyzed azide-alkyne cycloaddition reaction (CuAAC) in good to excellent yields at ambient temperature in water without requiring ligands, reducing agents and bases.
Stoichiometric sensitivity and structural diversity in click-active copper(<scp>i</scp>) N,S-heterocyclic carbene complexes
作者:Xiaoyan Han、Zhiqiang Weng、David James Young、Guo-Xin Jin、T. S. Andy Hor
DOI:10.1039/c3dt52059e
日期:——
A series of novel Cu(I) N,S-heterocycliccarbene (NSHC) complexes [Cu(μ-Br)(NSHC)]2, [Cu(μ-X)(NSHC)]4 (X = Br or I), [(NSHC)2Cu(μ-Br)2Cu(NSHC)], and [(NSHC)2CuBr] have been isolated from in situ generated CuOtBu and N-substituted benzothiazolium halides and characterized by X-ray crystallography. Five structural motifs were observed, viz. MxLy where x : y = 2 : 2, 4 : 4, 2 : 3, 1 : 2 and 2 : 4, with
一系列新颖的Cu(I)N,S-杂环卡宾(NSHC)配合物[Cu(μ-Br)(NSHC)] 2,[Cu(μ-X)(NSHC)] 4(X = Br或I) ,[(NSHC)2 Cu(μ-Br)2 Cu(NSHC)]和[(NSHC)2 CuBr]已从原位生成的CuO t Bu和N-取代的苯并噻唑鎓卤化物中分离出来,并通过X射线晶体学表征。观察到五个结构基序,即。M x L y其中x : y= 2:2、4:4、2:3、1:2和2:4,Cu⋯Cu的间距跨度范围为2.5626(7)至3.4725(7)Å。对这些化合物的催化活性的初步研究表明,不寻常的单核络合物6 [(NSHC)2 CuBr]是叠氮化物和炔烃的Huisgen 1,3-偶极环加成反应的活性催化剂,而络合物1-5和7则微不足道。不太活跃。
Green Catalytic Process for Click Synthesis Promoted by Copper Oxide Nanocomposite Supported on Graphene Oxide
作者:V. Hanuman Reddy、Y. V. Rami Reddy、B. Sridhar、B. V. Subba Reddy
DOI:10.1002/adsc.201501072
日期:2016.3.31
graphene oxide supported copper oxide (CuO–GO) has been investigated in Click synthesis of 1,2,3‐triazole derivatives under green reaction conditions. In the context of green approach, water is used as solvent under ligand free and aerobic conditions at room temperature, with lowcatalystloading (0.2 mol %) while ensuring the recovery and reusability of the catalyst. The catalyst affords excellent selectivity