1
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George RF, Kandeel M, El-Ansary DY, El Kerdawy AM. Some 1,3,5-trisubstituted pyrazoline derivatives targeting breast cancer: Design, synthesis, cytotoxic activity, EGFR inhibition and molecular docking. Bioorg Chem 2020; 99:103780. [PMID: 32224337 DOI: 10.1016/j.bioorg.2020.103780] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 03/17/2020] [Accepted: 03/19/2020] [Indexed: 01/09/2023]
Abstract
Different 1,3,5-trisubstituted pyrazoline derivatives 2a-c, 3-c, 4a-f, 6a-c, 7a-f and 8a-d were prepared via condensation reaction of the appropriate chalcone 1a-c or 5a-c with various hydrazine derivatives. All compounds were screened for their cytotoxicity against breast MCF-7 cancer cell line and the normal fibroblasts WI-38. Thirteen compounds 2a, 3a, 3c, 4a-d, 6c, 7d, 7e, 8b, 8d and 8f revealed promising cytotoxicity against MCF-7 compared to the reference standard staurosporine and they were safe to the normal fibroblasts WI-38. In addition, compounds 3c, 6c, 7d, 8b and 8d elicited higher cytotoxicity than erlotinib and exhibited promising EGFR inhibitory activity at submicromolar level comparable to that of erlotinib except for compound 8b that may exert its cytotoxicity via another mechanism besides EGFR inhibition. Molecular docking of 3c, 6c, 7d, 8b and 8d in the active site of EGFR confirmed the obtained results.
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Affiliation(s)
- Riham F George
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt.
| | - Manal Kandeel
- Pharmaceutical Chemistry Department, Faculty of Pharmaceutical Sciences and Pharmaceutical Industries, Future University in Egypt, Cairo, Egypt
| | - Dina Y El-Ansary
- Pharmaceutical Chemistry Department, Faculty of Pharmaceutical Sciences and Pharmaceutical Industries, Future University in Egypt, Cairo, Egypt
| | - Ahmed M El Kerdawy
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt; Department of Pharmaceutical Chemistry, Faculty of Pharmacy, New Giza University, Newgiza, km 22 Cairo-Alexandria Desert Road, Cairo, Egypt.
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2
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Soltani M, Memarian HR, Sabzyan H. Photooxidation of 3,5-diaryl-1-phenyl-2-pyrazolines: Experimental and computational studies. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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3
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Kulkarni P, Gawade S. Potassium Carbonate Assisted Synthesis Of α, β, γ, δ-Unsaturated Ketones. FRENCH-UKRAINIAN JOURNAL OF CHEMISTRY 2020. [DOI: 10.17721/fujcv8i2p17-25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The Cinnamylideneacetophenones derivative is shows important medicinal properties and intermediate in organic synthesis. Several substituted α, β, γ, δ-Unsaturated Ketones were prepared in high yield and purity by direct reaction of substituted cinnamaldehyde and ketones in the presence of potassium carbonate as a base in ethanol at 50ºC. The merit of the method is short reaction times, high yield, easy work-up and purification process, inexpensive and easily available catalyst.
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Affiliation(s)
- Pramod Kulkarni
- Post graduate center in Organic Chemistry and Department of Chemistry Hutatma Rajguru Mahavidyalaya
| | - Sammer Gawade
- Post graduate center in Organic Chemistry and Department of Chemistry Hutatma Rajguru Mahavidyalaya
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4
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Rocha S, Sousa A, Ribeiro D, Correia CM, Silva VLM, Santos CMM, Silva AMS, Araújo AN, Fernandes E, Freitas M. A study towards drug discovery for the management of type 2 diabetes mellitus through inhibition of the carbohydrate-hydrolyzing enzymes α-amylase and α-glucosidase by chalcone derivatives. Food Funct 2019; 10:5510-5520. [PMID: 31414099 DOI: 10.1039/c9fo01298b] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The inhibition of carbohydrate-hydrolyzing enzymes, α-amylase and α-glucosidase, is one of the major therapeutic strategies for the treatment of type 2 diabetes mellitus. Chalcones have been recognized for their multiple biological activities, including antidiabetic properties, through unclear mechanisms. In the present work, a panel of chalcones bearing hydroxy, methoxy, methyl, nitro, chloro, fluoro and bromo substituents were evaluated against α-amylase and α-glucosidase activities, most of them for the first time. The results showed that the substitution patterns and the type of substituents of chalcones influence their inhibitory activity. The presence of hydroxy groups at C-2'- and C-4' of the A ring and at C-3 and C-4 of the B ring favors the intended effect. Chalcones holding nitro groups and chloro substituents, together with a hydroxy group in the chalcone scaffold, showed strong inhibition of the α-glucosidase activity. The present study provides related scaffolds that may serve as the basis for the design and synthesis of new structures in order to obtain the ideal antidiabetic chalcone.
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Affiliation(s)
- Sónia Rocha
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal.
| | - Adelaide Sousa
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal.
| | - Daniela Ribeiro
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal.
| | - Catarina M Correia
- QOPNA & LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Vera L M Silva
- QOPNA & LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Clementina M M Santos
- QOPNA & LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Aveiro, Portugal and Centro de Investigação de Montanha (CIMO) Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
| | - Artur M S Silva
- QOPNA & LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Alberto N Araújo
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal.
| | - Eduarda Fernandes
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal.
| | - Marisa Freitas
- LAQV, REQUIMTE, Laboratory of Applied Chemistry, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal.
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5
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Memarian HR, Minakar R. Thermal electron-transfer-induced oxidation of 2-pyrazolines. Mol Divers 2019; 23:953-964. [PMID: 30712117 DOI: 10.1007/s11030-019-09922-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 01/18/2019] [Indexed: 11/29/2022]
Abstract
Various 3,5-diaryl-1-phenyl-2-pyrazolines were synthesized, and their thermal oxidation to their corresponding 2-pyrazoles was investigated using tetrabutylammonium peroxydisulfate in acetonitrile solution. Compared to the reported oxidative methods, this oxidizing agent provides a clean and non-expensive oxidative reaction in a short reaction time. Based on the proposed reaction mechanism, the extent of co-planarity of the C3-aryl ring toward C3=N2 double bond of the heterocyclic ring affects the electron-donating ability of the heterocyclic ring and decreases the time of oxidative reaction. The experimental results are supported by cyclic voltammetric measurements.
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Affiliation(s)
- Hamid Reza Memarian
- Department of Chemistry, University of Isfahan, Isfahan, 81746-73441, Islamic Republic of Iran.
| | - Reza Minakar
- Department of Chemistry, University of Isfahan, Isfahan, 81746-73441, Islamic Republic of Iran
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6
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Santos Bubniak LD, Gaspar PC, de Moraes ACR, Bigolin A, de Souza RK, Buzzi FC, Corrêa R, Filho VC, Bretanha LC, Micke GA, Nunes RJ, Santos-Silva MC. Effects of 1,3,5-triphenyl-4,5-dihydro-1H-pyrazole derivatives on cell-cycle and apoptosis in human acute leukemia cell lines. Can J Physiol Pharmacol 2017; 95:548-563. [DOI: 10.1139/cjpp-2016-0222] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Pyrazoline is an important 5-membered nitrogen heterocycle that has been extensively researched. Ten derivatives were synthesized and tested for antileukemic effects on 2 human acute leukemia cell lines, K562 and Jurkat. The most cytotoxic of these derivatives, compound 21, was chosen for investigation of cytotoxicity mechanisms. The results obtained with selectivity calculations revealed that compound 21 is more selective for acute leukemia (K562 and Jurkat cell lines) than for other tumor cell lines. Moreover, compound 21 was not cytotoxic to normal cell lines, indicating a potential use in clinical tests. Compound 21 caused a significant cell cycle arrest in the S-phase in Jurkat cells and increased the proportion of cells in the sub G0/G1 phase in both cell lines. Cells treated with compound 21 demonstrated morphological changes characteristic of apoptosis in the EB/AO assay, confirmed by externalization of phosphatidylserine by the annexin V – fluorescein isothiocyanate method and by DNA fragmentation. An investigation of cytotoxicity mechanisms suggests the involvement of an intrinsic apoptosis pathway due to mitochondrial damage and an increase in the ratio of mitochondrial Bax/Bcl2. Pyrazoline 21 obeyed Lipinski’s “rule of five” for drug-likeness. Based on these preliminary results, the antileukemic activity of compound 21 makes it a potential anticancer agent.
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Affiliation(s)
- Lorena dos Santos Bubniak
- Departamento de Análises Clínicas, Universidade Federal de Santa Catarina - UFSC, 89, Campus Trindade, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Pâmela Cristina Gaspar
- Departamento de Análises Clínicas, Universidade Federal de Santa Catarina - UFSC, 89, Campus Trindade, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Ana Carolina Rabello de Moraes
- Departamento de Análises Clínicas, Universidade Federal de Santa Catarina - UFSC, 89, Campus Trindade, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Alisson Bigolin
- Departamento de Análises Clínicas, Universidade Federal de Santa Catarina - UFSC, 89, Campus Trindade, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Rubia Karine de Souza
- Departamento de Análises Clínicas, Universidade Federal de Santa Catarina - UFSC, 89, Campus Trindade, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Fátima Campos Buzzi
- Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale de Itajaí, UNIVALI, CEP - Itajaí, Santa Catarina, Brazil
| | - Rogério Corrêa
- Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale de Itajaí, UNIVALI, CEP - Itajaí, Santa Catarina, Brazil
| | - Valdir Cechinel Filho
- Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale de Itajaí, UNIVALI, CEP - Itajaí, Santa Catarina, Brazil
| | - Lizandra Czermainski Bretanha
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Gustavo Amadeu Micke
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Ricardo José Nunes
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Maria Cláudia Santos-Silva
- Departamento de Análises Clínicas, Universidade Federal de Santa Catarina - UFSC, 89, Campus Trindade, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
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7
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1,1′-{1,4-Phenylene bis[3-(6-chloro-2-methyl-4-phenylquinolin-3-yl)-4,5-dihydro-1H-pyrazole-5,1-diyl]}dibutan-1-one. MOLBANK 2015. [DOI: 10.3390/m868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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8
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Moon HR, Yu J, Kim KH, Kim JN. Synthesis of Pyrazolo[1,5-a]quinolines from 1-Aryl-5-styrylpyrazoles via Intramolecular Friedel-Crafts Reaction/Aerobic Oxidation. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10225] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hye Ran Moon
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
| | - Jin Yu
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
| | - Ko Hoon Kim
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
| | - Jae Nyoung Kim
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
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9
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Resende DI, Guieu S, Oliva CG, Silva AM. Synthesis of 2,6-diaryl-1,2-dihydropyridines through a 6π-electrocyclization of N-sulfonylazatrienes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.10.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Kankala S, Kankala RK, Kommidi DR, Mudithanapelli C, Balaboina R, Vadde R, Jonnalagadda SB, Vasam CS. Synthesis and anti-cancer evaluation of steroidal diglycoside–pyrazoline hybrids. RSC Adv 2014. [DOI: 10.1039/c4ra05599c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A new series of pyrazoline-steroidal diglycoside hybrids were synthesized via catalyzed cyclocondensation of the corresponding chalcones, screened for in vitro cytotoxic activity and the SAR deduced.
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Affiliation(s)
- Shravankumar Kankala
- Department of Chemistry
- Kakatiya University
- Warangal, India
- School of Chemistry & Physics
- University of Kwazulu-Natal
| | - Ranjith Kumar Kankala
- Institute of Biotechnology
- National Dong-Hwa University
- Hualien 974, Republic of China
| | | | | | | | - Ravinder Vadde
- Department of Chemistry
- Kakatiya University
- Warangal, India
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11
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Cardia MC, Sanna ML, Meleddu R, Distinto S, Yañez M, Viña D, Lamela M, Maccioni E. A Novel Series of 3,4-Disubstituted Dihydropyrazoles: Synthesis and Evaluation for MAO Enzyme Inhibition. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.1072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Maria Cristina Cardia
- Dipartimento Farmaco Chimico Tecnologico; Università degli Studi di Cagliari; Via Ospedale; 72, 09124; Cagliari; Italy
| | - Maria Luisa Sanna
- Dipartimento Farmaco Chimico Tecnologico; Università degli Studi di Cagliari; Via Ospedale; 72, 09124; Cagliari; Italy
| | - Rita Meleddu
- Dipartimento Farmaco Chimico Tecnologico; Università degli Studi di Cagliari; Via Ospedale; 72, 09124; Cagliari; Italy
| | - Simona Distinto
- Dipartimento di Scienze Farmaco Biologiche; University “Magna Graecia” of Catanzaro; Campus “S. Venuta,”; 88100; Catanzaro (CZ); Italy
| | - Matilde Yañez
- Departamento de Farmacología and Instituto de Farmacia Industrial; Universidad de Santiago de Compostela, Campus Universitario Sur; E-15782; Santiago de Compostela; Spain
| | - Dolores Viña
- Departamento de Farmacología and Instituto de Farmacia Industrial; Universidad de Santiago de Compostela, Campus Universitario Sur; E-15782; Santiago de Compostela; Spain
| | - Manuel Lamela
- Departamento de Farmacología and Instituto de Farmacia Industrial; Universidad de Santiago de Compostela, Campus Universitario Sur; E-15782; Santiago de Compostela; Spain
| | - Elias Maccioni
- Dipartimento Farmaco Chimico Tecnologico; Università degli Studi di Cagliari; Via Ospedale; 72, 09124; Cagliari; Italy
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12
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Iványi Z, Szabó N, Huber J, Wölfling J, Zupkó I, Szécsi M, Wittmann T, Schneider G. Synthesis of D-ring-substituted (5'R)- and (5'S)-17β-pyrazolinylandrostene epimers and comparison of their potential anticancer activities. Steroids 2012; 77:566-74. [PMID: 22342542 DOI: 10.1016/j.steroids.2012.02.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 01/11/2012] [Accepted: 02/02/2012] [Indexed: 11/26/2022]
Abstract
Various steroidal benzylidenes were synthetized from pregnenolone with benzaldehyde and p-substituted benzaldehydes. The resulting 17β-chalconyl derivatives of pregnenolone were reacted with hydrazine hydrate in acetic acid solution. Regardless of the starting material, the ring-closure reaction afforded (in contrast with the literature data) a mixture of two steroidal pyrazoline epimers. The epimers were critical isomer pairs, which could be separated only in their acetylated form; their structures were investigated by NMR techniques. The in vitro inhibition of rat testicular C(17,20)-lyase activity and the antiproliferative effects on four human cancer cell lines were measured, and the results obtained from the two epimer series were compared.
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Affiliation(s)
- Zoltán Iványi
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
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13
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Silva VLM, Silva AMS, Pinto DCGA, Elguero J, Cavaleiro JAS. Synthesis of New 1H-Indazoles through Diels-Alder Transformations of 4-Styrylpyrazoles under Microwave Irradiation Conditions. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900513] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Tóth G, Simon A, Jenei A, Jeko J, Lévai A. NMR spectroscopic elucidation of the structure and stereochemistry of tricyclic 3-styrylpyrazolines. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:1025-1029. [PMID: 18803345 DOI: 10.1002/mrc.2309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Diastereomeric mixtures of tricyclic 3-styrylpyrazolines have been prepared by the reaction of 3-cynnamylidenechroman-4-ones and their 1-thio analogs with hydrazine in hot acetic acid or propionic acid solutions. The diastereomeric mixtures were separated by column chromatography to obtain the pure diastereomers. The elucidation of their structure and stereochemistry and complete (1)H and (13)C assignments have been performed by a combination of various one- and two-dimensional NMR experiments.
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Affiliation(s)
- Gábor Tóth
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary.
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Xie Z, Mo X, Liu G, Liu F. Synthesis and crystal structure of 5-pyrazol-4,5-dihydropyrazoles derivatives. J Heterocycl Chem 2008. [DOI: 10.1002/jhet.5570450539] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Kéki S, Nagy L, Török J, Tóth K, Lévai A, Zsuga M. Energy-variable collision-induced dissociation study of 1,3,5-trisubstituted 2-pyrazolines by electrospray mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:1799-808. [PMID: 17486690 DOI: 10.1002/rcm.3029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The pathways of the ([M+H](+)) ions generated from electrosprayed solutions of nine 1,3,5-trisubstituted 2-pyrazoline derivatives were studied using energy-variable collision-induced dissociation (CID) and pseudo-MS(3) (in-source CID combined with MS/MS) methods. It was shown that under CID conditions several structurally important product ions such as the 2,4-substituted azete and 1,2-substituted aziridine ions were formed. The compositions of the product ions were unambiguously supported by accurate mass measurement (mass accuracy was within +/- 8 ppm). The fragmentation pathways of 1,3,5-trisubstituted 2-pyrazolines were established by means of pseudo-MS(3). It was found that a substituent at the N-1 position greatly affects the fragmentation pathways of the 2-pyrazoline derivatives. The 1-acetyl- and 1-propionyl-2-pyrazoline derivatives dissociate mainly through formation of a pyrazolium cation, while in the case of 1-phenyl-2-pyrazoline derivatives product ions arising from the consecutive fragmentation of 2,4-substituted azete and 1,2-substituted aziridine ions dominate. Another interesting finding is the formation of a radical cation from the 2,4-substituted azete by loss of a methyl radical. The fragmentation yield as a function of the collision energy for each of the 1,3,5-trisubstituted 2-pyrazolines was determined. Based on the fragmentation yield versus collision energy curves the relative fragmentation stabilities for the 1,3,5-trisubstituted 2-pyrazoline derivatives were also evaluated.
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Affiliation(s)
- Sándor Kéki
- Department of Applied Chemistry, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary
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17
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Lévai A, Jekó J. Synthesis of 1-substituted 5-aryl-3-styryl-2-pyrazolines and 3-aryl-5-styryl-2-pyrazolines by the reaction of dibenzylideneacetones andE,E-cinnamylideneacetophenones with hydrazines. J Heterocycl Chem 2006. [DOI: 10.1002/jhet.5570430524] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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18
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Lévai A, Jekö J. Synthesis of 1-substituted 3,5-diaryl-2-pyrazolines by the reaction of α,β-unsaturated ketones with hydrazines. J Heterocycl Chem 2006. [DOI: 10.1002/jhet.5570430117] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Yaylı N, Sivrikaya SÖ, Yaşar A, Üçüncü O, Güleç C, Kolaylı S, Küçük M, Çelik E. Intramolecular 4π photocyclization of chalconoid-like compounds in solution and antimicrobial activities. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2005.03.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Lévai A, Jekö J, Brahmbhatt DI. Synthesis of 1-substituted 5-aryl-3-(3-coumarinyl)-2-pyrazolines by the reaction of 3-aryl-1-(3-coumarinyl)propen-1-ones with hydrazines. J Heterocycl Chem 2005. [DOI: 10.1002/jhet.5570420633] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Guirado A, Martiz B, Andreu R. First synthesis of 3-aryl-5-dichloromethyl-2-pyrazolines. The electrochemical generation of 2,2-dichlorovinylacetophenones as a key step. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Pinheiro JM, Ismael MI, Figueiredo JA, Silva AMS. Synthesis of new isoxazoles derivatives attached to sugar moieties. J Heterocycl Chem 2004. [DOI: 10.1002/jhet.5570410605] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Lévai A. Oxazepines and thiazepines. 41 . Synthesis of 4-aryl-2,3-dihydro-2-styryl-1,5-benzothiazepines by the reaction of (E,E)-cinnamylideneacetophenones with 2-aminothiophenol and their conversion into 2,2-disubstituted 3-acetyl-2,3-dihydrobezothiazoles. J Heterocycl Chem 2004. [DOI: 10.1002/jhet.5570410315] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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FUSED HETEROCYCLES 10* SYNTHESIS OF TRICYCLIC FUSED PYRAZOLINES BY THE REACTION OF (Z)-3-ARYLIDENE-1-THIOFLAVANONES WITH HYDRAZINES. HETEROCYCL COMMUN 2003. [DOI: 10.1515/hc.2003.9.3.287] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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