- 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
-
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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- Tungstic acid (H4WO5) immobilized on magnetic-based zirconium amino acid metal–organic framework: An efficient heterogeneous Br?nsted acid catalyst for l-(4-phenyl)-2,4-dihydropyrano[2,3c]pyrazole derivatives preparation
-
A new magnetic nanocatalyst based on the immobilization of tungstic acid onto new design robust, cost-effective, green, and scalable zirconium-L-aspartate amino acid metal–organic framework (MOF)-grafted L-(+)-tartaric acid stabilized magnetite nanopartic
- Khademi, Shima,Zahmatkesh, Saeed,Aghili, Alireza,Badri, Rashid
-
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- Sugarcane Bagasse Ash-Based Silica-Supported Boric Acid (SBA-SiO2-H3BO3): A Versatile and Reusable Catalyst for the Synthesis of 1,4Dihydropyrano[2,3c]pyrazole Derivatives
-
Abstract: A simple, green, and efficient protocol has been developed for the synthesis of biologically active 1,4dihydropyrano[2,3c]pyrazole derivatives via one-pot four-component reaction of various substituted benzaldehydes, hydrazine hydrate or phenylh
- Kumar, A.,Pandey, A. K.,Shrivastava, S. C.
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p. 653 - 660
(2021/06/02)
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- Synthesis, characterization and application of Fe3O4@SiO2@CPTMO@DEA-SO3H nanoparticles supported on bentonite nanoclay as a magnetic catalyst for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles
-
Fe3O4 nanoparticles were prepared and decorated on the surface of nanobentonite (NB), and subsequently modified by the organic and inorganic linkers and then sulfonic acid immobilization on the nanoparticles. The NB-Fe3Os
- Eftekhari far, Behrouz,Nasr-Esfahani, Masoud
-
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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
-
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
-
-
- Application of Yttrium Iron Garnet as a Powerful and Recyclable Nanocatalyst for One-Pot Synthesis of Pyrano[2,3-c]pyrazole Derivatives under Solvent-Free Conditions
-
The application of yttrium iron garnet (YIG) superparamagnetic nanoparticles as a new recyclable and highly efficient heterogeneous magnetic catalyst for one-pot synthesis of pyrano[2,3-c]pyrazole derivatives under solvent-free conditions, as well as etherification and esterification reactions are described. The advantages of the proposed method include the lack of organic solvents, clean reaction, rapid removal of the catalyst, short reaction times, excellent yields, and recyclability of the catalyst.
- Sedighinia,Badri,Kiasat
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p. 1755 - 1763
(2020/01/11)
-
- Zn(L-proline)2 as an efficient and reusable catalyst for the multi-component synthesis of pyran-annulated heterocyclic compounds
-
We have developed a simple, straightforward and highly efficient multi-component one-pot synthesis of 2-amino-3-cyano-4H-pyrans and pyran-annulated heterocyclic compounds. Zn(L-proline)2 has been utilized as a mild and efficient Lewis acid cata
- Tahmassebi, Daryoush,Blevins, John E.,Gerardot, Shori S.
-
-
- 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
-
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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- Preparation, characterization and catalytic application of molybdenum Schiff-base complex immobilized on silica-coated Fe3O4 as a reusable catalyst for the synthesis of pyranopyrazole derivatives
-
A recoverable molybdenum Schiff-base complex immobilized on silica-coated Fe3O4 nanoparticles was prepared and characterized. This superparamagntic nanocatalyst, which is separable using an external magnet, can be used as an efficien
- Hamrahian, Seyedeh Aghigh,Salehzadeh, Sadegh,Rakhtshah, Jamshid,Haji babaei, Farshid,Karami, Niloofar
-
-
- Environmentally benign synthesis of pyranopyrazole derivatives by cobalt Schiff-base complexes immobilized on magnetic iron oxide nanoparticles
-
In this work, an efficient and straight procedure has been described for one-pot three-component synthesis of pyranopyrazole derivatives in the presence of a new cobalt Schiff-base complex immobilized on silica-coated Fe3O4 nanoparti
- Shaabani, Behrouz,Maleki, Hossein,Rakhtshah, Jamshid
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p. 139 - 147
(2019/07/10)
-
- SBA-Pr-NH2 catalyzed preparation of pyrano[2, 3-c]pyrazoles under solvent-free conditions
-
This report provides a description of an efficient and simple procedure for the synthesis of pyrano[2, 3-c]pyrazole derivatives via a one-pot three-component reaction of arylmethylidene malononitrile, ethylacetoacetate and phenylhydrazine in the presence of amino-functionalized SBA-15 as a highly effective heterogeneous solid basic catalyst under solvent-free conditions. The remarkable advantages are the simplicity of the experimental procedures, high yields, short reaction times, and reusability of the catalyst.
- Zainali, Mahnaz,Amrollahi, Mohammad A.
-
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- A ternary hybrid system based on combination of mesoporous silica, heteropolyacid and double-layered clay: an efficient catalyst for the synthesis of 2,4-dihydro-3H-pyrazol-3-ones and pyranopyrazoles in aqueous medium: studying the effect of the synthetic
-
SBA/hydrotalcite/heteropolyacid nanocomposite is synthesized via a novel procedure in which the as-prepared heteropolyacid-loaded SBA-15 was impregnated with calcined hydrotalcite. The ternary hybrid system was characterized by using SEM/EDS, XRD, BET, TP
- Sadjadi, Samahe,Heravi, Majid M.,Zadsirjan, Vahideh,Farzaneh, Vahid
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p. 6765 - 6785
(2018/07/13)
-
- Synthesis and antimicrobial screening of pyrimidine annulated dihydropyrano[2, 3-c] pyrazole derivatives
-
A series of pyrimidine annulated dihydropyrano[2, 3-c]pyrazole derivatives were synthesized and screened for their antimicrobial activity. The precursor, dihydropyrano[2, 3-c]pyrazole was synthesised under catalyst free condition using PEG-400 as reaction
- Hegde, Hemant,Ahn, Chuljin,Waribam, Preeti,Shetty, Nitinkumar S.
-
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- Amino acid ionic liquid-based titanomagnetite nanoparticles: An efficient and green nanocatalyst for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles
-
The amino acid ionic liquid tetrabutylammonium asparaginate (TBAAsp) was immobilized on titanomagnetite (Fe3?xTixO4) nanoparticles in a facile one-pot process using an organosilane compound (TMSP) as spacer. The modified F
- Azarifar, Davood,Badalkhani, Omolbanin,Abbasi, Younes
-
-
- One-pot three-component process for the synthesis of substituted pyrano[2,3-c]pyrazoles catalyzed by nanostructured FSM-16-SO3H
-
A three-component process for the one-pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles by the reaction of aldehydes, 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one, and malononitrile in the presence of FSM-16-SO3/s
- Hashemi-Uderji, Somayeh,Abdollahi-Alibeik, Mohammad
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p. 1709 - 1719
(2018/07/06)
-
- Spirocyclopropanes from Intramolecular Cyclopropanation of Pyranopyrazoles and Pyranopyrimidine-diones and Lewis Acid Mediated (3 + 2) Cycloadditions of Spirocyclopropylpyrazolones
-
A robust intramolecular cyclopropanation reaction was first performed on pyranopyrazole and pyranopyrimidine-dione derivatives to obtain spirocyclopropylpyrazolones and barbiturates, using iodosylbenzene (PhIO) or the combination of iodobenzene diacetate (PIDA)/molecular iodine (I2), under mild reaction conditions. Syntheses of functionally and stereochemically diversified, novel spiropyrazolone fused 2-iminothiophene and spiropyrazolone fused pyrroline scaffolds were also demonstrated via Lewis acid catalyzed highly diastereoselective (3 + 2) cycloaddition reactions of the synthesized spiro-cyclopropyl pyrazolones with phenyl isothiocyanate and benzonitrile, respectively.
- Mukherjee, Prasun,Das, Asish R.
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p. 2794 - 2802
(2017/03/14)
-
- Amberlite-supported L-prolinate: A novel heterogeneous organocatalyst for the three-component synthesis of 4H-pyrano[2,3-c]pyrazole derivatives
-
This report describes a new and convenient procedure for heterogenization of L-proline organocatalyst, which is based on non-covalent immobilization of L-proline on the surface of anion-exchange resin amberlite IRA900OH (AmbIRA900OH) as an efficient, chea
- Nazari,Keshavarz
-
p. 539 - 545
(2017/05/01)
-
- Application of a biological-based nanomagnetic catalyst in the synthesis of bis-pyrazols and pyrano[3,2-c]pyrazoles
-
{Fe3O4@SiO2@(CH2)3-thiourea dioxide-SO3H/HCl}, a newly reported nanomagnetic core–shell supported solid acid catalyst, was successfully employed in the preparation of 4,4′-(arylmethylene)bi
- Zolfigol, Mohammad Ali,Navazeni, Mahdiyeh,Yarie, Meysam,Ayazi-Nasrabadi, Roya
-
-
- Synthesis of Novel Tacrine Analogs as Acetylcholinesterase Inhibitors
-
In this work, a wide range of novel pyrazolo[4′,3′:5,6]pyrano[2,3-b]quinolin-5-amines were synthesized as tacrine analogs. At first, reaction of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one, aromatic aldehydes, and malononitrile gave 6-amino-4-aryl-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles. Then, reaction of the latter compounds with cyclohexanone led to the formation of the title compounds. Also, they were evaluated for their in vitro acetylcholinesterase and butyrylcholinesterase inhibitory activities. Interestingly, most of them showed good inhibitory activity comparing with rivastigmine as the reference drug.
- Mahdavi, Mohammad,Saeedi, Mina,Gholamnia, Laleh,Jeddi, Seyed Amir Behzad,Sabourian, Reyhaneh,Shafiee, Abbas,Foroumadi, Alireza,Akbarzadeh, Tahmineh
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p. 384 - 390
(2017/02/05)
-
- Morpholine triflate promoted one-pot, four-component synthesis of dihydropyrano[2,3-c]pyrazoles
-
A one-pot, four-component reaction of ethyl acetoacetate, hydrazine hydrate, aldehydes, and malononitrile was discussed using Lewis acid catalyst morpholine triflate (MorT) to afford a series of dihydropyrano[2,3-c]pyrazoles, which were generally catalyze
- Zhou, Chen-Feng,Li, Jian-Jun,Su, Wei-Ke
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p. 1686 - 1690
(2016/11/11)
-
- Applications of a novel nano magnetic catalyst in the synthesis of 1,8-dioxo-octahydroxanthene and dihydropyrano[2,3-c]pyrazole derivatives
-
Imidazole-based ionic liquid-stabilized on silica coated Fe3O4 magnetic nano particles [nano-Fe3O4SiO2(CH2)3-Imidazole-SO3H]Cl as a novel heterogeneous acidic catalyst
- Zolfigol, Mohammad Ali,Ayazi-Nasrabadi, Roya,Baghery, Saeed,Khakyzadeh, Vahid,Azizian, Saeid
-
-
- Aqua-mediated multicomponent synthesis of various 4H-pyran derivatives catalyzed by poly(4-vinylpyridine)-supported copper iodide nanoparticle catalyst
-
A green and efficient approach for synthesis of some new 4H-pyran derivatives is reported, catalyzed by green recyclable poly(4-vinylpyridine)-supported copper iodide nanoparticle catalyst in water. This procedure has many advantages such as operational s
- Albadi, Jalal,Mansournezhad, Azam
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p. 5739 - 5752
(2016/06/01)
-
- 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
-
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)
-
- Green synthesis of tetrahydrobenzo[b] pyrans, pyrano[2,3-c] pyrazoles and spiro[indoline-3,4′-pyrano[2,3-c] pyrazoles catalyzed by nano-structured diphosphate in water
-
A green and recoverable nano-structured diphosphate (Na2CaP2O7) was synthesized and fully characterized using FT-IR spectra, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray
- Maleki, Behrooz,Nasiri, Negar,Tayebee, Reza,Khojastehnezhad, Amir,Akhlaghi, Hossien Ali
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p. 79128 - 79134
(2016/09/09)
-
- Identification of benzochromene derivatives as a highly specific NorA efflux pump inhibitor to mitigate the drug resistant strains of s. aureus?
-
Increased expression of efflux transport proteins confers the Multi Drug Resistant (MDR) phenotype to drug resistant bacteria, which can be mitigated by efflux pump inhibitors (EPI). EPI's have the dual advantage of restoring efficacy of antibiotics and retarding the evolution of drug resistant mutants. In this study, 17 heterocyclic derivatives synthesized by a polyethylenimine (PEI) catalyzed one-pot protocol were evaluated for their EPI potential. Based on in silico studies and in vitro studies, 5 benzochromene (BC) based compounds (among 17 heterocyclic derivatives), were observed to significantly potentiate the effect of ciprofloxacin (CPX) and displayed a best modulation factor of 32, against the NorA overexpressed mutant SA-1199B. Toxicity analyses using the zebrafish model showed that, from all the benzochromene compounds evaluated, BC9 exhibited low toxicity. BC9 inhibited the NorA efflux pump at a minimum effective concentration (MEC) of 2 mg ml1 (4.03 mM) and even at subinhibitory concentrations, and it was effective in reversing the CPX MIC of both the ATCC strain and a clinical isolate of MRSA by 128 and 4 fold respectively. Our results show that benzochromene derivative BC9 is a highly specific NorA inhibitor that can be employed to mitigate MDR strains of S. aureus that overexpress the NorA efflux pump.
- Ganesan, Asaithampi,Christena, Lowrence Rene,Subbarao, Himesh Makala Venkata,Venkatasubramanian, Ulaganathan,Thiagarajan, Raman,Sivaramakrishnan, Venkatabalasubramanian,Kasilingam, Kabilan,Saisubramanian, Nagarajan,Ganesan, Subramaniapillai Selva
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p. 30258 - 30267
(2018/04/26)
-
- Catalytic applications of {[HMIM]C(NO2)3}: As a nano ionic liquid for the synthesis of pyrazole derivatives under green conditions and a mechanistic investigation with a new approach
-
Catalytic applications of 1-methylimidazolium trinitromethanide {[HMIM]C(NO2)3}as the first nano ionic liquid (NIL) was studied. The described NIL was efficiently tested in the synthesis of 5-amino-pyrazole-4-carbonitrile derivatives
- Zolfigol, Mohammad Ali,Afsharnadery, Fatemeh,Baghery, Saeed,Salehzadeh, Sadegh,Maleki, Farahnaz
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p. 75555 - 75568
(2015/09/21)
-
- Magnetically recyclable nano-FDP: A novel, efficient nano-organocatalyst for the one-pot multi-component synthesis of pyran derivatives in water under ultrasound Irradiation
-
Highly stable, super-paramagnetic nanoparticle supported L-proline catalyst (nano-FDP) which shows extra-ordinary catalytic activity was synthesized for the first time from economical and easily available starting materials. Characterization of the synthe
- Dam, Binoyargha,Saha, Mithu,Pal, Amarta Kumar
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p. 1808 - 1816
(2019/11/28)
-
- BF3 bonded nano Fe3O4 (BF3/MNPs): An efficient magnetically recyclable catalyst for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives
-
A simple and efficient procedure for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives has been developed by a one-pot three-component reaction of various aldehydes with malononitrile and 3-methyl-1-phenyl-2-pyrazoline-5-one in the presence of
- Abdollahi-Alibeik, Mohammad,Moaddeli, Ali,Masoomi, Kianoosh
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p. 74932 - 74939
(2015/09/21)
-
- Tin sulfide nanoparticles supported on activated carbon as an efficient and reusable Lewis acid catalyst for three-component one-pot synthesis of 4H-pyrano[2,3-c]pyrazole derivatives
-
Tin sulfide nanoparticles (SnS-NPs) were prepared in aqueous solution at room temperature on the surface of activated carbon (AC) and were investigated using field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-r
- Iravani, Nasir,Keshavarz, Mosadegh,Shojaeian Kish, Hossein Ali,Parandvar, Rasool
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p. 626 - 633
(2015/09/28)
-
- HClO4-sio2 nanoparticles: An efficient and versatile catalyst for synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles
-
The reaction between aromatic aldehydes, malononitrile and 3-methyl-1-phenyl-2-pyrazoline-5-one catalysed by silica supported perchloric acid nanoparticles (HClO4-sio2 nanoparticles) in solvent H2O under reflux provided a
- Sadeghi, Bahareh,Shirkhani, Mona,Hassanabadi, Alireza
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p. 112 - 114
(2015/06/16)
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- Electro-catalyzed multicomponent transformation of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one to 1,4-dihydropyrano[2,3-c]pyrazole derivatives in green medium
-
Abstract An efficient and convenient synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives is described, using the electrogenerated anion of ethanol as the base in the presence of sodium bromide as an supporting electrolyte in a one-pot, three compone
- Vafajoo, Zahra,Hazeri, Nourallah,Maghsoodlou, Malek Taher,Veisi, Hojat
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supporting information
p. 973 - 976
(2015/08/18)
-
- Covalently supported sulfonic and acetic acids onto polypyrrole asgreen, cheap and recoverablesolid acid catalysts for the synthesis of 4H-pyrano[2,3-c]pyrazoles
-
Sulfonated polypyrrole nanospheres and polypyrrole N-functionalized acetic acid were synthesized. The catalytic efficiency of the prepared solid acid catalysts for the synthesis of 4Hpyrano[2,3-c]pyrazoles derivatives was evaluated and compared. The resul
- Fadavipoor, Elham,Nazari, Simin,Ahmadi, Amanollah Zarei,Gorjizadeh, Maryam,Afshari, Mozhgan,Keshavarz, Mosadegh
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p. 733 - 739
(2015/10/28)
-
- N,2-Dibromo-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide: An efficient and homogeneous catalyst for one-pot synthesis of 4H-pyran, pyranopyrazole and pyrazolo[1,2-b]phthalazine derivatives under aqueous media
-
N,2-Dibromo-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide (DCDBTSD) as a highly efficient and homogeneous catalyst was successfully applied for the synthesis of 4H-pyran, pyranopyrazole and pyrazolo[1,2-b]phthalazine derivat
- Khazaei, Ardeshir,Zolfigol, Mohammad Ali,Karimitabar, Fatemeh,Nikokar, Iraj,Moosavi-Zare, Ahmad Reza
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p. 71402 - 71412
(2015/09/08)
-
- Nano α-Al2O3 supported ammonium dihydrogen phosphate (NH4H2PO4/Al2O3): Preparation, characterization and its application as a novel and heterogeneous catalyst for the one-pot synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-c]pyrazole derivatives
-
A simple, efficient, and environmentally benign route was developed for the preparation of 2-amino-3-cyano-4-aryl-7,7-dimethyl-5,6,7,8-tetrahydrobenzo[b]pyrans and 6-amino-5-cyano-4-aryl-1,4-dihydropyrano[2,3-c]pyrazoles from the condensation of various aldehydes, malononitrile, and 1,3-dicarbonyl compounds (1,3-cyclohexanedione or 5,5-dimethyl-1,3-cyclohexanedione) or 3-methyl-1-phenyl-2-pyrazoline-5-one, using NH4H2PO4/Al2O3 with good yields. The use of easily available catalyst, shorter reaction times, better yields, the simplicity of the reaction, the heterogeneous system, and the easy work up are the advantages of the present method. Characterization of the catalyst was performed by FT-IR spectroscopy, X-ray diffraction (XRD) techniques, thermal analysis (TG/DTG) and Transmission electron microscopy (TEM).
- Maleki, Behrooz,Ashrafi, Samaneh Sedigh
-
p. 42873 - 42891
(2015/02/19)
-
- Nano-titania-supported Preyssler-type heteropolyacid: An efficient and reusable catalyst in ultrasound-promoted synthesis of 4H-chromenes and 4H-pyrano[2,3-c]pyrazoles
-
An efficient and convenient procedure has been described for one-pot multi-component synthesis of tetrahydrobenzo[b]pyrans known as 4H-chromenes and 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of nano-titania-supported Preyssler-type hete
- Azarifar, Davood,Khatami, Seyed-Mola,Nejat-Yami, Razieh
-
-
- Nano-titania-supported Preyssler-type heteropolyacid: An efficient and reusable catalyst in ultrasound-promoted synthesis of 4H-chromenes and 4H-pyrano[2,3-c]pyrazoles
-
An efficient and convenient procedure has been described for one-pot multi-component synthesis of tetrahydrobenzo[b]pyrans known as 4H-chromenes and 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of nano-titania-supported Preyssler-type hete
- Azarifar, Davood,Khatami, Seyed-Mola,Nejat-Yami, Razieh
-
-
- Nano-titania sulfuric acid-promoted synthesis of tetrahydrobenzo[b]pyran and 1,4-dihydropyrano[2,3-c]pyrazole derivatives under ultrasound irradiation
-
An efficient and convenient procedure has been described for one-pot synthesis of tetrahydrobenzo[b]pyran and 1,4-dihydropyrano[2,3-c]pyrazole derivatives in the presence of nano-titania sulfuric acid (15-nm TSA) as a heterogeneous catalyst. The catalyst
- Azarifar, Davood,Khatami, Seyed-Mola,Zolfigol, Mohammad Ali,Nejat-Yami, Razieh
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p. 1223 - 1230
(2014/08/05)
-
- Novel silica sodium carbonate (SSC): Preparation, characterization and its first catalytic application to the synthesis of new dihydropyrano[2,3-c] pyrazoles
-
In this study, a novel and highly efficient catalyst was produced from a reaction between silica chloride and sodium hydrogen carbonate. This novel catalyst was named silica sodium carbonate (SSC), and was characterized by FT-IR, XRD, XRF and TG-DT analys
- Eskandari, Khalil,Karami, Bahador,Khodabakhshi, Saeed
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p. 124 - 130
(2014/07/08)
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- An environmentally friendly synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives catalyzed by tungstate sulfuric acid
-
An efficient three-component synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles via a reaction between 3-methyl-1-phenyl-2-pyrazolin-5-one, aromatic aldehydes and malononitrile using tungstate sulfuric acid as a cataly
- Farahi, Mahnaz,Karami, Bahador,Sedighimehr, Iman,Tanuraghaj, Hamideh Mohamadi
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p. 1580 - 1582
(2015/02/02)
-
- Novel silica sodium carbonate (SSC): Preparation, characterization and its first catalytic application to the synthesis of new dihydropyrano[2,3-c]pyrazoles
-
In this study, a novel and highly efficient catalyst was produced from a reaction between silica chloride and sodium hydrogen carbonate. This novel catalyst was named silica sodium carbonate (SSC), and was characterized by FT-IR, XRD, XRF and TG-DT analys
- Eskandari, Khalil,Karami, Bahador,Khodabakhshi, Saeed
-
p. 124 - 130
(2015/03/18)
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- CTACl AS catalyst for four-component, one-pot synthesis of pyranopyrazole derivatives in aqueous medium
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An environmentally benign four-component reaction in aqueous medium in the presence of cetyltrimethylammonium chloride (CTACl) has been developed for the synthesis of 6-amino-3-methyl-4-aryl-/1-phenyl-1,4-dihydropyrano[2,3-c]pyrazole- 5-carbonitrile. The
- Wu, Mingshu,Feng, Qinqin,Wan, Dehui,Ma, Jinya
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p. 1721 - 1726
(2013/05/09)
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- Expeditious, four-component synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives catalyzed by trichloroacetic acid or ceric sulfate
-
Two efficient and convenient procedures for the synthesis of 6-amino-3-methyl-1,4-diphenyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile derivatives based on four-component reaction involving ethyl acetoacetate, phenylhydrazine, malononitrile, and vario
- Karimi-Jaberi, Zahed,Shams, Mohammad Mehdi Reyazo,Pooladian, Baharak
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p. 105 - 108
(2013/07/05)
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- Synthesis of pyran derivatives under ultrasound irradiation using Ni nanoparticles as reusable catalysts in aqueous medium
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Ni nanoparticles (NPs)-catalysed synthesis of pyran derivatives was achieved by one-pot three-component reactions of aryl aldehydes/ketone, malononitrile and C-H activated compounds in aqueous medium under ultrasound irradiation. The present approach offe
- Saha, Mithu,Das, Babulal,Pal, Amarta Kumar
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p. 1079 - 1085
(2013/12/04)
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- Synthesis, characterization, and in vitro biological studies of some novel pyran fused pyrimidone derivatives
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A variety of pyrano[2,3-d]pyrimidine-5-one derivatives 5,6(a-j) have been synthesized from 6-amino-4-(substituted phenyl)-5-cyano-3-methyl-1-phenyl-1,4- dihydropyrano[2,3-c]pyrazole derivatives 4(a-j) via cyclization using formic acid and acetic acid. All
- Mistry, Prashant T.,Kamdar, Nimesh R.,Haveliwala, Dhaval D.,Patel, Saurabh K.
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scheme or table
p. 349 - 357
(2012/06/30)
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- Trichloroacetic acid as a solid heterogeneous catalyst for the rapid synthesis of dihydropyrano[2,3-c]pyrazoles under solvent-free conditions
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A one-pot, three-component reaction of an aromatic aldehyde, malononitrile and 3-methyl-1-phenyl-2-pyrazolin-5-one in the presence of a catalytic amount of trichloroacetic acid produces a 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4- dihydropyrano[2,3-c]p
- Karimi-Jaberi, Zahed,Shams, Mohammad Mehdi Reyazo
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experimental part
p. 177 - 179
(2012/03/10)
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- Greener approach towards the facile synthesis of 1,4-dihydropyrano[2,3-c]pyrazol-5-yl cyanide derivatives at room temperature
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This report describes triethylammonium acetate (TEAA) ionic liquid catalyzed one pot synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles by the reaction of aromatic aldehyde, malononitrile and 3-methyl-1-phenyl-2-pyrazo
- Balaskar, Ravi S.,Gavade, Sandip N.,Mane, Madhav S.,Shingate, Bapurao B.,Shingare, Murlidhar S.,Mane, Dhananjay V.
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experimental part
p. 1175 - 1179
(2011/10/08)
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- H14[NaP5W30O110] catalyzed one-pot three-component synthesis of dihydropyrano[2,3-c]pyrazole and pyrano[2,3-d]pyrimidine derivatives
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This is a report of an efficient, clean and facile method for the synthesis of 1,4-dihydropyrano[2,3-c] pyrazole and pyrano[2,3d]pyrimidine derivatives via three-component one-pot condensation of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one or barbituric acid,
- Heravi,Ghods,Derikvand,Bakhtiari,Bamoharram
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experimental part
p. 615 - 620
(2010/11/05)
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- Synthesis of 3-methyl-6-amino-5-cyano-4-aryl-1-phenyl-1,4-dihydropyrano [2,3-c]pyrazole catalysed by KF-montmorillonite
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The reaction of substituted arylidenemalononitrilesand3-methyl-1-phenyl-2- pyrazolin-5-one in DMF in the presence of KF-montmorillonite provides a rapid synthesis of 3-methyl-6-amino-5-cyano-4-aryl-1-phenyl-1,4-dihydropyrano[2,3-c] pyrazole derivatives.
- Wu, Nan,Li, Xinnian,Wang, Yumei,Shi, Daqing
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- Sulfamic acid catalysed one-pot three-component condensation for the synthesis of 1,4-dihydropyrano[2,3-c]pyrazoles
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A clean and simple synthesis of 6-amino-4-aryl-3-methyl-1-phenyl-1,4- dihydropyrano[2,3-c]pyrazole-5-carbonitriles was accomplished in good to excellent yields via the one-pot three component condensation of 3-methyl-1-phenyl- 2-pyrazolin-5-one, an aromat
- Shinde, Sandeep V.,Jadhav, Wamanrao N.,Kondre, Jeevan M.,Gampawar, Sumit V.,Karade, Nandkishor N.
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experimental part
p. 278 - 279
(2009/04/06)
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- D,L-proline-catalyzed one-pot synthesis of pyrans and pyrano[2,3-c]pyrazole derivatives by a grinding method under solvent-free conditions
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D,L-Proline was found to efficiently catalyze the one-pot condensation of aromatic aldehydes, malononitrile, and dimedone (1,3-cyclohexanedione or 3-methyl-1-phenyl-2-pyrazolin-5-one) 2-Amino-3-cycano-4-aryl-7,7-dimethyl-5,6,7, 8-tetrahydrobenzo[b]pyrans
- Guo, Shao-Bo,Wang, Shu-Xiang,Li, Ji-Tai
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p. 2111 - 2120
(2008/02/05)
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