- Supported palladium oxide nanoparticles in Al-SBA-15 as an efficient and reusable catalyst for the synthesis of pyranopyrazole and benzylpyrazolyl coumarin derivatives via multicomponent reactions
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An eco-friendly method for diversity-oriented synthesis of substituted dihydropyrano[2,3-c]pyrazole and benzylpyrazolyl coumarin derivatives has been achieved via one-pot and multicomponent reaction in the presence of PdO/Al-SBA-15 as an efficient and rec
- Heravi, Majid M.,Malakooti, Reihaneh,Kafshdarzadeh, Kosar,Amiri, Zahra,Zadsirjan, Vahideh,Atashin, Hassan
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p. 203 - 234
(2022/01/19)
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- Magnetization of biochar nanoparticles as a novel support for fabrication of organo nickel as a selective, reusable and magnetic nanocatalyst in organic reactions
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Catalyst species are an important class of materials in chemistry, industry, medicine and biotechnology. Also, waste recycling is an important process in green chemistry and economic efficiency. Therefore, in order to recycle waste, biochar nanoparticles were prepared from chicken manure. Then, the biochar nanoparticles were magnetized under a green and environmentally friendly method. Finally, the surface of the magnetic biochar nanoparticles was modified and further they were applied as a novel support for fabrication of nickel as a homoselective and reusable catalyst in organic reactions. The structure of this organic-inorganic catalyst has been characterized by N2adsorption-desorption isotherms, and the SEM, EDS, WDX, XRD, TGA, AAS, FT-IR and VSM techniques. This magnetically recyclable catalyst was used in the homoselective synthesis of tetrazole and pyranopyrazole derivatives. This catalyst can be reused several times without significant loss of its catalytic efficiency. The heterogeneity and stability of this nanocatalyst were studied by hot filtration and the AAS technique. Also, the reused catalyst was characterized by the SEM, EDS, AAS and BET techniques.
- Moradi, Parisa,Hajjami, Maryam
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p. 2981 - 2994
(2021/02/26)
-
- Concentrated solar radiation-assisted one-pot/multicomponent synthesis of pyranopyrazole derivatives under neat condition
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Concentrated solar radiation (CSR)-assisted synthesis of pyranopyrazole derivatives under solvent and catalyst-free condition has been reported in the present protocol. One-pot multicomponent synthesis from aromatic/heteroaldehyde, ethyl acetoacetate, malononitrile, and hydrazine hydrate leads to the final desired compounds in a good yield. This operationally simple methodology has several advantages such as green and clean reaction profile, simple workup and purification procedures, extremely short reaction time, atom efficiency, and being economical. The current energy-efficient method saves almost 98% of energy as compared to the conventional method. Graphical abstract: [Figure not available: see fulltext.]
- Gadkari, Yatin U.,Hatvate, Navnath T.,Telvekar, Vikas N.
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p. 4245 - 4255
(2021/07/17)
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- Magnetized melamine-modified polyacrylonitrile (PAN@melamine/Fe3O4) organometallic nanomaterial: Preparation, characterization, and application as a multifunctional catalyst in the synthesis of bioactive dihydropyrano [2,3-c]pyrazole
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An efficient magnetic polymer-based nanomaterial was prepared in three main steps including synthesis of polyacrylonitrile (PAN), modification of PAN with melamine, and magnetization of the PAN@melamine compound by in situ construction of Fe3O
- Hassanzadeh-Afruzi, Fereshte,Dogari, Haniyeh,Esmailzadeh, Farhad,Maleki, Ali
-
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- Synthesis and characterization of pine-cone derived carbon-based solid acid: A green and recoverable catalyst for the synthesis of pyra-no_pyrazole, amino-benzochromene, amidoalkyl naphthol and thiazoli-dinedione derivatives
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In this report, SO3H-functionalized Carbon nanoparticles (Pine-SO3H) with high acid density have been synthesized by the thermal treatment of sulfuric acid with Pine-Cone as carbon-based at 180oC in a sealed autoclave in a
- Ghorbani, Fatemeh,Pourmousavi, Seied Ali,Kiyani, Hamzeh
-
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- An approach to the synthesis and characterization of HMS/Pr-Rh-Zr as efficient catalyst for synthesis of tetrahydrobenzo[b]pyran and 1,4-dihydropyrano[2,3-c]pyrazole derivatives
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The aim of present investigation is the synthesis of mesoporous catalyst based on hexagonal mesoporous silica. HMS support has exceptional properties such as easy synthesis, high surface area, large pore volume and wormhole pores. These distinctive charac
- Abdolahi, Sahar,Hajjami, Maryam,Gholamian, Fatemeh
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p. 1883 - 1904
(2021/02/26)
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- Magnesium ferrichromate nanoparticles: an efficient and recyclable catalyst in the synthesis of pyrano[2,3-c]pyrazole derivatives
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Magnetically separable magnesium ferrichromate nanoparticles (MgFeCrO4 NPs) were synthesized by aqueous combustion synthesis (ACS) using glycine as the fuel. The as-synthesized powder was characterized using XRD, FTIR, SEM–EDX and SQUID techniq
- Yellapurkar, Ishita,Bhabal, Sonal,Ramana,Jangam, Kundan,Salve, Vaibhav,Patange, Sunil,More, Paresh
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p. 2669 - 2687
(2021/03/22)
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- Nano cobalt ferrite encapsulated-silica particles bearing melamine as an easily recyclable catalyst for the synthesis of dihydropyrano[2,3-c]pyrazoles under green conditions
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In this research, it was displayed an efficient method for synthesis of 6-amino-2,4-dihydropyrano[2,3-c] pyrazol-5-carbonitrile derivatives by using CoFe2O4 silica supported bearing melamine as a magnetic nanocatalyst. This nanocompo
- Dadaei, Mahla,Naeimi, Hossein
-
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- Catalyst-free green synthesis of dihydropyrano[2,3-c]pyrazole scaffolds assisted by ethylene glycol (E-G) as a reusable and biodegradable solvent medium
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Abstract: We revealed a catalyst-free, green and rapid one-pot four-component tandem strategy for the preparation of dihydropyrano[2,3-c]pyrazoles – a biologically significant scaffold – via Knoevenagel-Michael cyclocondensation based on green chemistry p
- Mohamadpour, Farzaneh
-
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- Copper and nickel immobilized on cytosine@MCM-41: as highly efficient, reusable and organic–inorganic hybrid nanocatalysts for the homoselective synthesis of tetrazoles and pyranopyrazoles
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In this work, a green approach is reported for efficient synthesis of biologically active tetrazole and pyranopyrazole derivatives in the presence of Cu-Cytosine@MCM-41 and Ni-Cytosine@MCM-41 (copper (II) and nickel (II) catalyst on the modified MCM-41 us
- Nikoorazm, Mohsen,Tahmasbi, Bahman,Gholami, Shahab,Moradi, Parisa
-
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- Nano silica extracted from horsetail plant as a natural silica support for the synthesis of H3PW12O40 immobilized on aminated magnetic nanoparticles (Fe3O4@SiO2-EP-NH-HPA): a novel and effi
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Abstract: In this work, nanomesoporous silica has been prepared from horsetail (Equisetum arvense), which is a medicinal plant, with high surface area. This natural silica has been applied as a support to prepare H3PW12O40
- Hosseini Mohtasham, Nina,Gholizadeh, Mostafa
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p. 3037 - 3066
(2020/04/17)
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- DABA MNPs: A new and efficient magnetic bifunctional nanocatalyst for the green synthesis of biologically active pyrano[2,3-: C] pyrazole and benzylpyrazolyl coumarin derivatives
-
In this work, a new core-shell magnetic silica nanocatalyst functionalized with 3,4-diaminobenzoic acid (Fe3O4@SiO2@PTS-DABA) was successfully prepared and characterized using different spectroscopic methods or techniques including FT-IR, FE-SEM, VSM, XRD
- Karami, Shahriar,Dekamin, Mohammad G.,Valiey, Ehsan,Shakib, Peyman
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p. 13952 - 13961
(2020/09/03)
-
- Preparation and characterization of a novel organic–inorganic hybrid nanostructure: application in synthesis of spirocompounds
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Abstract: Immobilization and heterogenization of acidic/basic groups or organic tags on inorganic supports have found many important applications in recent years. In this investigation, a new hybrid organic–inorganic nanostructure was prepared. The struct
- Ahadi, Najmieh,Bodaghifard, Mohammad Ali,Mobinikhaledi, Akbar
-
p. 3277 - 3294
(2020/05/25)
-
- Green synthesis of pyranopyrazoles via biocatalytic one-pot Knoevenagel condensation–Michael-type addition–heterocyclization cascade in non-aqueous media
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Abstract: An efficient, green and facile route for the one-pot four-component synthesis of pyranopyrazole derivatives through the condensation of the aromatic aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate using baker’s yeast as biocat
- Pandey, Rajat,Pratap, Umesh,Shrivas, Prabhakar,Wankhade, Atul,Zodape, Sangesh
-
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- An inorganic–organic hybrid material based on a Keggin-type polyoxometalate@Dysprosium as an effective and green catalyst in the synthesis of 2-amino-4H-chromenes via multicomponent reactions
-
A novel inorganic–organic hybrid, [Dy4(PDA)4(H2O)11(SiMo12O40)]·7H2O denoted as (POM@Dy-PDA), based on a lanthanide cluster, a Keggin-type polyoxomolybdate, and PDA (1,10-phenant
- Hosseinzadeh-Baghan, Sara,Mirzaei, Masoud,Eshtiagh-Hosseini, Hossein,Zadsirjan, Vahideh,Heravi, Majid M.,Mague, Joel T.
-
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- Novel biocompatible core/shell Fe3O4?NFC?Co(ii) as a new catalyst in a multicomponent reaction: An efficient and sustainable methodology and novel reusable material for one-pot synthesis of 4: H -pyran and pyranopyrazole in aqueous media
-
Today, due to the developing need for inexpensive catalysts, recyclable magnetic nanocatalysts immobilized on polysaccharides possess many advantages over classical heterogeneous catalysts. However, cellulose has been an appealing material in catalysis sc
- Bagherzade, Ghodsieh,Eshghi, Hossein,Kargar, Pouya Ghamari
-
p. 37086 - 37097
(2020/10/27)
-
- An expedient and eco-friendly approach for multicomponent synthesis of dihydropyrano[2,3-c]pyrazoles using nano-Al2O3/BF3/Fe3O4 as reusable catalyst
-
The pyranopyrazole derivatives have many biological activities. They were synthesized via a four-component coupling of aromatic aldehyde, malononitrile, ethyl acetoacetate and hydrazine hydrate. In this study, dihydropyrano[2,3-c]pyrazoles have been synth
- Babaei, Elaheh,Mirjalili, Bi Bi Fatemeh
-
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- Copper-immobilized ionic liquid as an alternative to organic solvents in the one-pot synthesis of bioactive dihydropyrano[2,3-c]pyrazole derivatives
-
In this study, a novel Cu-immobilized ionic liquid (IL)was designed, characterized, and employed as both promoter and solvent in the synthesis of some dihydropyrano[2,3-c]pyrazoles. The synthesized ionic liquid was characterized by 1H NMR, sup
- Ghafuri, Hossein,Kazemnezhad Leili, Maede,Esmaili Zand, Hamid Reza
-
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- Synthesis and antimicrobial study of 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of amino-functionalized silica-coated cobalt oxide nanostructures as catalyst
-
In this research a series of pyranopyrazoles were efficiently synthesized via the one-pot four-component reactions of ethyl acetoacetate, hydrazinehydrate, aldehydes and malononitrile in the presence of Co3O4@SiO2-tNH
- Shahbazi, Shakiba,Ghasemzadeh, Mohammad Ali,Shakib, Pegah,Zolfaghari, Mohammad Reza,Bahmani, Mahmoud
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p. 172 - 179
(2019/06/18)
-
- Sodium gluconate: An efficient organocatalyst for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives
-
Sodium gluconate presented as a category of biomolecule found to be a proficient and recyclable organocatalyst for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives via one-pot multicomponent reaction of aryl aldehyde, malononitrile, ethyl acetoac
- Khandebharad, Amol,Sarda, Swapnil,Soni, Mahesh,Agrawal, Brijmohan
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p. 331 - 340
(2019/11/29)
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- Alpha-Casein: an efficient, green, novel, and eco-friendly catalyst for one-pot multi-component synthesis of bis (pyrazol-5-ols), dihydro-pyrano[2,3-c]pyrazoles and spiropyranopyrazoles in an environmentally benign manner
-
For the first time, alpha-Casein was used as an efficient and eco-friendly catalyst for an effective and facile preparation of dihydropyranopyrazoles and spiropyranopyrazoles. The synthesis of bis (pyrazol-5-ols) derivatives was developed via one-pot, pseudo-five-component condensation, and the target dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles were prepared by one-pot four-component reaction. This new method of employing alpha-Casein, which is a green, recyclable, non-toxic and commercially available catalyst, offers advantages such as mild condition, short reaction times, easy work-up, no need for column chromatography, and high yields of the products which make it more economic than other environmentally synthetic protocols.
- Milani, Jalili,Maghsoodlou, Malek Taher,Hazeri, Nourallah,Nassiri, Mahmoud
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p. 1651 - 1664
(2019/04/25)
-
- A convenient route toward one-pot multicomponent synthesis of spirochromenes and pyranopyrazoles accelerated via quinolinic acid
-
In the present work, the catalytic activity of quinolinic acid (QUIN) was studied for the synthesis of spirochromene and pyranopyrazole derivatives from readily available materials. The salient features of these one-pot multicomponent protocols are the clean reaction profile, easy isolation of products, no chromatographic separation techniques, high efficiency, short reaction time, and high yield of products plus using QUIN as a new, inexpensive, commercially available, and efficient organocatalyst.
- Oudi, Maryam,Sanchooli Tazeh, Kazem,Hazeri, Nourallah,Fatahpour, Maryam,Ahmadi, Raheleh
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p. 1721 - 1728
(2019/06/08)
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- A concise route for the one-pot multi-component synthesis of 4,6-disubstituted 2-aminopyridine-3-carbonitriles and pyranopyrazoles using cobalt (II) nitrate hexahydrate as catalyst
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Three facile and efficient routes for one-pot, cobalt (II) nitrate hexahydrate catalyzed multi-component synthesis of 2-amino-3-cyanopyridine and pyranopyrazole derivatives have been developed. The present protocols offer the products in good yields from the simple and readily available starting materials. The other salient features of these protocols are operational simplicity, easy isolation of product without the need of column chromatographic purification, and the use of cobalt (II) nitrate hexahydrate as an efficient catalyst.
- Pejman, Hamed,Hazeri, Nourallah,Fatahpour, Maryam,Faroughi Niya, Homayoun
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p. 241 - 247
(2019/07/31)
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- Novel task-specific ionic liquid [Et2NH(CH2)2CO2H][AcO] as a robust catalyst for the efficient synthesis of some pyran-annulated scaffolds under solvent-free conditions
-
A novel task-specific ionic liquid, 2-carboxy-N,N-diethylethanaminium acetate denoted as [Et2NH(CH2)2CO2H][AcO], is prepared in an easy process and fully characterized by using suitable methods such as FT-IR, 1H-NMR, 13C-NMR, and TG, DTG and DTA analyses. After preparation, the promoting ability of this catalyst for one-pot multicomponent synthesis of 2-amino-4H-chromenes, dihydropyrano[3,2-c]chromenes and dihydropyrano[2,3-c]pyrazoles using in situ-developed arylidenemalononitriles through Knoevenagel reaction under solvent-free conditions is described. The sustainable procedure, short reaction times (6–36?min), effortless work-up, non-chromatographic purification, good-to-excellent product yields (79–96%), ease of recovery and reusability of the catalyst up to six reaction runs without a decrease of activity are the notable features of the present protocol.
- Shaikh, Mohd Akmal,Farooqui, Mazahar,Abed, Syed
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p. 1595 - 1617
(2019/01/04)
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- A highly efficient and reusable catalyst for the synthesis of 4H-benzo[b]pyran derivatives
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A series of substituted 4H-pyrans derivatives were synthesized by a one-pot, multi-component reaction of aromatic aldehydes, malononitrile, and pyrazolone derivatives or active methylene carbonyl compounds such as dimedone, in the presence of 1,3-dimethyl
- Redouane, Mohamed Abdenour,Khiri-Meribout, Naima,Benzerka, Saida,Debache, Abdelmadjid
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p. 167 - 179
(2020/02/27)
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- Natural Phosphate K09 as a New Reusable Catalyst for the Synthesis of Dihydropyrano[2,3-c]Pyrazole Derivatives at Room Temperature
-
Abstract: In this study, we report a simple, efficient and green protocol for the synthesis of pyrano[2,3-c]pyrazole derivatives by the use of the natural phosphate K09 as a mild and efficient heterogeneous catalyst. The catalytic efficiency of K09 was compared with other heterogeneous catalysts to determine the best catalyst for said conversion. Easy recovery of the catalyst and its reusability, room temperature reaction conditions, short reaction time, excellent yields, are some of the important features of this protocol.
- El Mejdoubi,Sallek,Digua,Chaair,Oudadesse
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p. 536 - 542
(2019/09/04)
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- Design and development of a new functionalized cellulose-based magnetic nanocomposite: preparation, characterization, and catalytic application in the synthesis of diverse pyrano[2,3-c]pyrazole derivatives
-
In this work, a facile protocol for the preparation of a new cellulose-based functionalized magnetic nanocomposite catalyst is described. The structure and morphology of the prepared nanomaterial was characterized by scanning electron microscopy, energy-d
- Maleki, Ali,Eskandarpour, Vahid
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p. 1459 - 1472
(2019/06/10)
-
- MIL-53(Fe) Metal–Organic Frameworks (MOFs) as an Efficient and Reusable Catalyst for the One-Pot Four-Component Synthesis of Pyrano[2,3-c]-pyrazoles
-
A novel and simple approach for the efficient and rapid synthesis of pyrano[2,3-c]-pyrazoleshas been accomplished via the four-component condensation reaction of malononitrile, hydrazine hydrate, ethyl acetoacetate, and substituted aldehydes using MIL-53(
- Ghasemzadeh, Mohammad Ali,Mirhosseini-Eshkevari, Boshra,Abdollahi-Basir, Mohammad Hossein
-
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- Ce(III) immobilized on aminated poly(vinyl chloride): high-performance synergistic bifunctional acid–base catalyst for one-pot synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles
-
A bifunctional acid–base catalyst of CeIII immobilized on ethylenediamine (EDA)-grafted poly(vinyl chloride) (PVC) has been prepared by a simple approach. First, PVC was treated with EDA to afford aminated poly(vinyl chloride) (PVC–EDA). Therea
- Zhang, Tianzhu,Zhou, Junbin,Chen, Yang,Li, Yiqun
-
p. 5329 - 5344
(2018/08/21)
-
- An efficient protocol for the one-pot four-component synthesis of 6-amino-1,4-dihydropyrano[2,3-c]-pyrazole-5-carbonitrile derivatives using starch solution as a reaction media
-
An efficient, high-yielding and rapid protocol has been developed for the synthesis of 6-amino-l,4-dihydropyrano [2,3-c]pyrazol-5-carbonitrile derivatives through four-component, one-pot cyclocondensation reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes and malononitrile utilizing starch solution as a highly efficient homogenous catalyst. The use of a nontoxic, reusable and biodegradable catalyst is one of the superior advantagesof this protocol. Short reaction times, mild conditions, excellent product yields, simple work-up procedure and non use of toxic organic solvents are added advantages of this procedure.
- Vekariya, Rajesh H.,Patel, Kinjal D.,Patel, Hitesh D.
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p. 576 - 582
(2019/05/21)
-
- Synergetic effects of naturally sourced metal oxides in organic synthesis: a greener approach for the synthesis of pyrano[2,3-c]pyrazoles and pyrazolyl-4H-chromenes
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Abstract: A clean and more economic protocol for the synthesis of pyrano[2,3-c]pyrazoles and pyrazolyl-4H-chromenes has been carried out using bael fruit ash (BFA) as a non-conventional natural catalyst in aqueous condition at ambient temperature. The catalyst was obtained from renewable resources by simple thermal treatment to dry rind of Aegle marmelos (Bael) fruit and formation of its active phase was confirmed by AAS, DSC-TGA, XRD, FT-IR, and SEM techniques. The BFA catalyst was found to be a green, highly active, easily biodegradable, and recyclable without loss of activity after the fifth run. The methodology provides an alternative platform to the conventional catalyzed process. Graphical Abstract: [Figure not available: see fulltext.].
- Shinde, Sachin K.,Patil, Megha U.,Damate, Shashikant A.,Patil, Suresh S.
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p. 1775 - 1795
(2017/12/06)
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- Highly functionalized pyranopyrazoles: synthesis, antimicrobial activity, simulation studies and their structure activity relationships (SARs)
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Abstract: Development of potent antibacterial and antifungal agents is a permanently new and unremitting investigation in the therapeutic field. Still, medicinal research wants to find the best antimicrobial agent. To attain this goal , here, the present work synthesis, simulation, and antimicrobial studies of pyranopyrazole derivatives were discussed. Among the reported compounds, 4b has dominant antimicrobial activity that was due to its higher dipole moment. Also, this compound has the most hydrophilic nature and low Eg value. Besides, compound 4e has the next higher dipole moment, hydrophilic property and efficient biological activity. The rationale of these results explained that the comparison of electronic results with biological data is the better way to find the potent pharmaceutical drug compounds. Graphical abstract: [Figure not available: see fulltext.]
- Reddy, Guda Mallikarjuna,Sravya, Gundala,Yuvaraja, Gutha,Camilo, Alexandre,Zyryanov, Grigory V.,Garcia, Jarem Raul
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p. 7491 - 7507
(2018/08/25)
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- H5BW12O40 as a green and efficient homogeneous but recyclable catalyst in the synthesis of 4H-Pyrans via multicomponent reaction
-
Keggin-type heteropolyacid, H5BW12O40 (BWA) with a higher negative charge and stronger Br?nsted acidity comparing to Si and P derivatives was used as an efficient, green, and reusable catalyst in a three-component reaction
- Heravi, Majid M.,Mirzaei, Masoud,Beheshtiha, Seyed Yahya Shirazi,Zadsirjan, Vahideh,Mashayekh Ameli, Fatemeh,Bazargan, Maryam
-
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- Sodium ascorbate as an expedient catalyst for green synthesis of polysubstituted 5-aminopyrazole-4-carbonitriles and 6-amino-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles
-
Sodium ascorbate (SA) was used as a safe catalyst for the synthesis of 5-aminopyrazole-4-carbonitriles from the one-pot three-component cyclocondensation (3-CC) of aldehydes, phenylhydrazine, and malononitrile at 50?°C. This 3-CC proceeds in a mixture of
- Kiyani, Hamzeh,Bamdad, Maryam
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p. 2761 - 2778
(2018/01/27)
-
- One-pot four-component synthesis of 1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles catalyzed by potassium phthalimide
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The potassium phthalimide (PPI) promoted a domino Knoevenagel-Michael-cyclocondensation of a wide variety of aldehydes, ethyl acetoacetate, malononitrile, and hydrazine derivatives to afford the 1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles in high yie
- Kiyani, Hamzeh,Bamdad, Maryam
-
p. 221 - 226
(2017/07/22)
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- Using magnetized water as a solvent for a green, catalyst-free, and efficient protocol for the synthesis of pyrano[2,3-c]pyrazoles and pyrano[4′,3′:5,6]pyrazolo [2,3-d]pyrimidines
-
A facile, eco-friendly, and highly efficient one-pot four-component protocol is demonstrated for the synthesis of the pyrano[2,3-c]pyrazole and pyrano[4′,3′:5,6]pyrazolo [2,3-d]pyrimidine derivatives using magnetized water as a new green solvent. Simplici
- Bakherad, Mohammad,Keivanloo, Ali,Gholizadeh, Mostafa,Doosti, Rahele,Javanmardi, Mohaddese
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p. 1013 - 1029
(2017/02/10)
-
- Organocatalyzed domino reactions: diversity oriented synthesis of pyran-annulated scaffolds using in situ-developed benzylidenemalononitriles
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Molecular diversity for the synthesis of pyran annulated heterocyclic scaffolds has been achieved from the multicomponent reaction of aldehyde, malonitrile and a third participant such as dimedone, barbituric acid and 3-methyl-1H-pyrazol-5(4H)-one. The re
- Ahad, Abdul,Farooqui, Maqdoom
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p. 2445 - 2455
(2017/03/22)
-
- Aspirin: an efficient catalyst for synthesis of bis (pyrazol-5-ols), dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles in an environmentally benign manner
-
Abstract: This article aimed to present two facile and environmental friendly routes for the rapid assembly of?biologically active compounds including pyrazol core using aspirin as a novel and green catalyst. The synthesis of bis(pyrazol-5-ol) derivatives was developed via one-pot, pseudo-five-component condensation, and the target dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles were prepared by one-pot, four-component reaction. These reactions can be performed in tandem from readily available starting materials. The main merits of the present methods are operational simplicity, no need for column chromatography, inexpensive materials, avoidance of harmless and corrosive acid catalysts, short reaction times, good yields of the products, and utilization of aspirin as a non-toxic, cheap, commercially available, and efficient catalyst.
- Fatahpour, Maryam,Noori Sadeh, Fatemeh,Hazeri, Nourallah,Maghsoodlou, Malek Taher,Lashkari, Mojtaba
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p. 1945 - 1956
(2017/08/14)
-
- Synthesis of Pyranopyrazoles under Eco-friendly Approach by Using Acid Catalysis
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Multicomponent synthesis of pyranopyrazole derivatives by using montmorillonite K-10 as a reusable green acid catalyst under eco-friendly method in the presence of eco-friendly solvent leads to novel protocol. Moreover, catalyst could be reused five times for the reaction without noticeable loss of activity. The scope of this path was to develop new synthetic molecules by using green catalysis for further screenings such as starting molecules for organic electronic materials and biological assays.
- Reddy, Guda Mallikarjuna,Raul Garcia, Jarem
-
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- Bovine serum albumin: An efficient and green biocatalyst for the one-pot four-component synthesis of pyrano[2,3-c]pyrazoles
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The use of biocatalysts is attracting an increasing amount of attention in chemical catalysis. Here, we have shown that bovine serum albumin (BSA), a ubiquitous, inexpensive, non-enzymatic transport protein, can serve as an efficient, retrievable catalyst
- Huang, Xingtian,Li, Zhipeng,Wang, Dongyang,Li, Yiqun
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p. 1461 - 1467
(2016/10/04)
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- Fruit juice of Citrus limon as a biodegradable and reusable catalyst for facile, eco-friendly and green synthesis of 3,4-disubstituted isoxazol-5(4H)-ones and dihydropyrano[2,3-c]-pyrazole derivatives
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Abstract: Fruit juice of Citrus limon (lemon juice) has been utilized as a natural and renewable catalyst for the green and environmentally friendly preparation of 3,4-disubstituted isoxazol-5(4H)-one derivatives and 6-amino-1,4-dihydropyrano[2,3-c]-pyraz
- Vekariya, Rajesh H.,Patel, Kinjal D.,Patel, Hitesh D.
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p. 7559 - 7579
(2016/09/20)
-
- An Organobase (TBD)-Anchored Mesoporous Silica Nanoparticle-Catalyzed Green Synthesis of Dihydropyrano[2,3-c]pyrazoles
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An efficient, mild, and environmental friendly method has been developed for the synthesis of dihydropyrano[2,3-c]pyrazole in ethanolic water over 1,5,7-triazabicyclo-[4,4,0]-dec-1-ene (TBD)-anchored mesoporous silica nanoparticle catalyst. The method inv
- Karmakar, Bikash
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p. 1117 - 1123
(2016/10/13)
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- Glycerol mediated green and one-pot synthesis of 6-amino-1,4-dihydropyrano [2,3-c]-pyrazole-5-carbonitriles under catalyst free conditions
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A concise, facile and straightforward synthetic protocol has been described for the preparation of 6-amino-1,4-dihydropyrano[2,3-c]-pyrazole-5-carbonitrile derivatives by a one-pot, three-component reaction of ethyl acetoacetate, hydrazine hydrate, aryl a
- Vekariya, Rajesh H.,Patel, Hitesh D.
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p. 999 - 1006
(2017/11/10)
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- A green and one-pot synthesis of a library of 1,4-dihydropyrano[2,3-c]-pyrazole-5-carbonitrile derivatives using thiourea dioxide (TUD) as an efficient and reusable organocatalyst
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Abstract: The efficacy of thiourea dioxide (TUD) as an efficient, inexpensive, and readily accessible organocatalyst for the synthesis of 1,4-dihydropyrano[2,3-c]-pyrazole-5-carbonitrile derivatives via a four-component reaction of ethyl acetoacetate, hyd
- Vekariya, Rajesh H.,Patel, Kinjal D.,Patel, Hitesh D.
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p. 4683 - 4696
(2016/07/06)
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- Silica-coated magnetic NiFe2O4 nanoparticles-supported H3PW12O40; Synthesis, preparation, and application as an efficient, magnetic, green catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-c]pyrazole derivatives
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A powerful, magnetic, supported, acid catalyst, NiFe2O4@SiO2-H3PW12O40, was prepared by chemical support of Keggin (H3PW12O40) heteropolyacid (HPA) on silica-coated NiFe2O4 magnetic nanoparticles. XRD, TEM, SEM, VSM, and FTIR confirmed that the keggin HPA is well dispersed on the surface of silica-coated NiFe2O4 magnetic nanoparticles. The magnetically recoverable catalyst could be easily recycled at least six times without significant loss of catalytic activity. After full characterization, its catalytic activity was investigated in the synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-c]pyrazole derivatives. Graphical Abstract: (1) Novel silica-coated magnetic NiFe2O4 nanoparticles-supported H3PW12O40 was fabricated and characterized. (2) Recyclability of the catalyst. (3) Avoiding use of corrosive acid catalysts. (4) Green chemistry.
- Maleki, Behrooz,Eshghi, Hossein,Barghamadi, Mohammad,Nasiri, Negar,Khojastehnezhad, Amir,Sedigh Ashrafi, Samaneh,Pourshiani, Omid
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p. 3071 - 3093
(2016/04/05)
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