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Elattar KM, El-Mekabaty A. Bicyclic 5-6 Systems: Comprehensive Synthetic Strategies for the Annulations of Pyrazolo[ 1,5-a]pyrimidines. Curr Org Synth 2021; 18:547-586. [PMID: 33966620 DOI: 10.2174/1570179418666210509015108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 03/16/2021] [Accepted: 03/25/2021] [Indexed: 11/22/2022]
Abstract
Pyrazolopyrimidines are a privileged class of 5-6 bicyclic systems with three or four nitrogen atoms, including four possible isomeric structures. The significance of this class of compounds is that they can be applied in medical and pharmaceutical fields due to their unlimited biological aptitude, hence it is the basic skeleton of several synthetic drugs. The current review aimed to highlight all the synthetic routes that have been applied to construct the pyrazolo[1,5-a]pyrimidine ring systems up to date. The sections in this study included the synthesis of pyrazolo[1,5- a]pyrimidines by condensation reactions of 5-aminopyrazoles with each of β-diketones, 1,5-diketones, β- ketoaldehydes, α-cyanoaldehydes, β-enaminones, enamines, enaminonitriles, ethers, with unsaturated ketones, unsaturated thiones, unsaturated esters, unsaturated dienones "1,2-allenic", unsaturated aldehydes, unsaturated imines, and unsaturated nitriles. The routes adopted to synthesize this class of heterocyclic compounds were extended for ring construction from acyclic reagents and multicomponent reactions under catalytic or catalyst-free conditions.
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Affiliation(s)
- Khaled M Elattar
- Chemistry Department, Faculty of Science, Mansoura University, El-Gomhoria Street, Mansoura, 35516, Egypt
| | - Ahmed El-Mekabaty
- Chemistry Department, Faculty of Science, Mansoura University, El-Gomhoria Street, Mansoura, 35516, Egypt
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2
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Jismy B, Guillaumet G, Akssira M, Tikad A, Abarbri M. Efficient microwave-assisted Suzuki–Miyaura cross-coupling reaction of 3-bromo pyrazolo[1,5- a]pyrimidin-5(4 H)-one: towards a new access to 3,5-diarylated 7-(trifluoromethyl)pyrazolo[1,5- a]pyrimidine derivatives. RSC Adv 2021; 11:1287-1302. [PMID: 35747396 PMCID: PMC9134006 DOI: 10.1039/d0ra07959f] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 12/06/2020] [Indexed: 12/24/2022] Open
Abstract
A convenient and efficient synthetic route to C3-arylated 7-trifluoromethylpyrazolo[1,5-a]pyrimidin-5-one derivatives has been reported starting from 3-bromo-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-5-one through a Suzuki–Miyaura cross-coupling reaction. The arylation (heteroarylation) strategy can be performed using a wide variety of aryl and heteroaryl boronic acids and requiring a tandem catalyst XPhosPdG2/XPhos to avoid the debromination reaction. These optimized conditions were successfully extended to the synthesis of 7-, 8- and 9-arylated pyrimido[1,2-b]indazol-2-ones from their corresponding brominated starting materials. Furthermore, the second C-5 arylation of C3-arylated pyrazolo[1,5-a]pyrimidin-5-ones was achieved under standard Suzuki–Miyaura cross-coupling conditions, after activating the C–O bond of the lactam function with PyBroP, giving access to a small library of 3,5-diarylated 7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidines in good to excellent yields. The interest of this approach has been highlighted by the synthesis of a known anti-inflammatory agent. Additionally, a preliminary biological evaluation has revealed that a number of derivatives display micromolar IC50 values against monoamine oxidase B, an important target in the field of neurodegenerative disorders. A convenient and efficient synthetic route to C3-arylated 7-trifluoromethylpyrazolo[1,5-a]pyrimidin-5-one derivatives has been reported starting from 3-bromo-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-5-one through a Suzuki–Miyaura cross-coupling reaction.![]()
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Affiliation(s)
- Badr Jismy
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E). EA 6299
- Faculté des Sciences
- 37200 Tours
- France
| | - Gérald Guillaumet
- Institut de Chimie Organique et Analytique (ICOA)
- Université d'Orléans
- UMR CNRS 7311
- France
| | - Mohamed Akssira
- Laboratoire de Chimie Physique et de Chimie Bioorganique
- URAC 22
- 28800 Mohammedia
- Morocco
| | - Abdellatif Tikad
- Laboratoire de Chimie Moléculaire et Substances Naturelles
- Faculté des Sciences
- Département de Chimie
- Université Moulay Ismail
- Meknès 50050
| | - Mohamed Abarbri
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l'Energie (PCM2E). EA 6299
- Faculté des Sciences
- 37200 Tours
- France
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Elattar KM, El‐Mekabaty A. Heterocyclic steroids: Synthetic routes and biological characteristics of steroidal fused bicyclic pyrimidines. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4174] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Khaled M. Elattar
- Chemistry Department, Faculty of Science Mansoura University Mansoura Egypt
| | - Ahmed El‐Mekabaty
- Chemistry Department, Faculty of Science Mansoura University Mansoura Egypt
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Jismy B, Guillaumet G, Allouchi H, Akssira M, Abarbri M. Concise and Efficient Access to 5,7-Disubstituted Pyrazolo[1,5-a]pyrimidines by Pd-Catalyzed Sequential Arylation, Alkynylation and SNArReaction. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701024] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Badr Jismy
- Département de Chimie; Université François Rabelais; Laboratoire d'Infectiologie et Santé Publique (UMR 1282); équipe Recherche et Innovation en Chimie Médicinale; Parc de Grandmont 37200 Tours France
- Laboratoire de Chimie Physique et de Chimie Bioorganique; Département de Chimie Université Hassan II de Casablanca; URAC 22; 28800 Mohammedia Maroc
| | - Gérald Guillaumet
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans; UMR CNRS 7311; BP 6759, rue de Chartres 45067 Orléans Cedex2 France
| | - Hassan Allouchi
- Département de Chimie; Université François Rabelais; Laboratoire d'Infectiologie et Santé Publique (UMR 1282); équipe Recherche et Innovation en Chimie Médicinale; Parc de Grandmont 37200 Tours France
| | - Mohamed Akssira
- Laboratoire de Chimie Physique et de Chimie Bioorganique; Département de Chimie Université Hassan II de Casablanca; URAC 22; 28800 Mohammedia Maroc
| | - Mohamed Abarbri
- Département de Chimie; Université François Rabelais; Laboratoire d'Infectiologie et Santé Publique (UMR 1282); équipe Recherche et Innovation en Chimie Médicinale; Parc de Grandmont 37200 Tours France
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Zemlyanaya NI, Borodina VV, Musatov VI, Shishkina SV, Sofronov DS, Lipson VV. Cyclocondensations of 3-alkylpyrazol-5-amines with 3-arylprop-2-enals and cyclic 1,3-diketones. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1070428017040145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lipson VV, Borodina VV, Zemlyanaya NI, Shirobokova MG, Musatov VI, Shishkina SV, Sofronov DS. Domino reactions of 3-methyl-5-aminopyrazole with aryl(hetaryl)aldehydes, cyclopentanone, cyclopentan-1,3-dione, and 1,3-indanedione. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2015. [DOI: 10.1134/s1070428015050206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Petrova ON, Zamigajlo LL, Ostras KS, Shishkina SV, Shishkin OV, Borisov AV, Musatov VI, Shirobokova MG, Lipson VV. Multicomponent Reaction of 2-aminobenzimidazole, Arylglyoxals, and 1,3-cyclohexanedione. Chem Heterocycl Compd (N Y) 2015. [DOI: 10.1007/s10593-015-1700-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Synthesis and biological evaluation of 7-trifluoromethylpyrazolo[1,5- a ]pyrimidines as anti-inflammatory and antimicrobial agents. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2014.08.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Li M, Zhao BX. Progress of the synthesis of condensed pyrazole derivatives (from 2010 to mid-2013). Eur J Med Chem 2014; 85:311-40. [PMID: 25104650 DOI: 10.1016/j.ejmech.2014.07.102] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Revised: 07/25/2014] [Accepted: 07/26/2014] [Indexed: 01/08/2023]
Abstract
Condensed pyrazole derivatives are important heterocyclic compounds due to their excellent biological activities and have been widely applied in pharmaceutical and agromedical fields. In recent years, numerous condensed pyrazole derivatives have been synthesized and advanced to clinic studies with various biological activities. In this review, we summarized the reported synthesis methods of condensed pyrazole derivatives from 2010 until now. All compounds are divided into three parts according to the rings connected to pyrazole-ring, i.e. [5, 5], [5,F 6], and [5, 7]-condensed pyrazole derivatives. The biological activities and applications in pharmaceutical fields are briefly introduced to offer an orientation for the design and synthesis of condensed pyrazole derivatives with good biological activities.
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Affiliation(s)
- Meng Li
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China
| | - Bao-Xiang Zhao
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China.
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10
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A facile one-pot synthesis of 7-substituted pyrazolo[1,5-a]pyrimidines by base induced three-component reaction. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Three-Component Synthesis of 4-Aroyl-2(1),4,5,7-Tetrahydropyrazolo[3,4-b]Pyridin-6-Ones and Their Properties. Chem Heterocycl Compd (N Y) 2014. [DOI: 10.1007/s10593-014-1502-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Kaishap PP, Baruah S, Shekarrao K, Gogoi S, Boruah RC. A facile method for the synthesis of steroidal and nonsteroidal 5-methyl pyrazolo[1,5-a]pyrimidines. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.04.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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13
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Hossein nia R, Mamaghani M, Shirini F, Tabatabaeian K. A Convenient One-Pot Three-Component Approach for Regioselective Synthesis of Novel Substituted Pyrazolo[1,5-a]pyrimidines Using Fe+3-Montmorillonite as Efficient Catalyst. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.1576] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Roghayeh Hossein nia
- Department of Chemistry, Faculty of Sciences; University of Guilan; P.O. Box 41335-1914 Rasht Iran
| | - Manouchehr Mamaghani
- Department of Chemistry, Faculty of Sciences; University of Guilan; P.O. Box 41335-1914 Rasht Iran
| | - Farhad Shirini
- Department of Chemistry, Faculty of Sciences; University of Guilan; P.O. Box 41335-1914 Rasht Iran
| | - Khalil Tabatabaeian
- Department of Chemistry, Faculty of Sciences; University of Guilan; P.O. Box 41335-1914 Rasht Iran
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14
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Cyclocondensation of 3(5)-Aminopyrazoles with Arylglyoxals and Cyclohexane-1,3-diones. Chem Heterocycl Compd (N Y) 2013. [DOI: 10.1007/s10593-013-1332-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Affiliation(s)
- Wafaa S. Hamama
- a Chemistry Department, Faculty of Science , Mansoura University , Mansoura , Egypt
| | - Mona E. Ibrahim
- a Chemistry Department, Faculty of Science , Mansoura University , Mansoura , Egypt
| | - Hanafi H. Zoorob
- a Chemistry Department, Faculty of Science , Mansoura University , Mansoura , Egypt
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16
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17
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Hamama WS, Ibrahim ME, Zoorob HH. Efficient Regioselective Synthesis and Potential Antitumor Evaluation of Isoxazolo[5,4-b]pyridines and Related Annulated Compounds. Arch Pharm (Weinheim) 2012; 345:468-75. [DOI: 10.1002/ardp.201100258] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 12/12/2011] [Accepted: 12/20/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Wafaa S Hamama
- Faculty of Science, Department of Chemistry, Mansoura University, Mansoura, Egypt.
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18
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Portilla J, Quiroga J, Nogueras M, Cobo J. Regioselective synthesis of fused pyrazolo[1,5-a]pyrimidines by reaction of 5-amino-1H-pyrazoles and β-dicarbonyl compounds containing five-membered rings. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.12.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Zhang ZT, Ma YQ, Liang Y, Xue D, He Q. An efficient one-pot synthesis of diarylpyrazolo[1,5-a]pyrimidine from isoflavones. J Heterocycl Chem 2010. [DOI: 10.1002/jhet.546] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Petrov AA, Kasatochkin AN, Emelina EE, Nelyubina YV, Antipin MY. α-Amino azoles in the synthesis of heterocycles: VI. Synthesis and structure of cycloalkane-annulated pyrazolo[1,5-a]pyrimidines. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2009. [DOI: 10.1134/s1070428009090139] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Lipson VV, Gorobets NY. One hundred years of Meldrum’s acid: advances in the synthesis of pyridine and pyrimidine derivatives. Mol Divers 2009; 13:399-419. [DOI: 10.1007/s11030-009-9136-x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2008] [Accepted: 02/25/2009] [Indexed: 11/28/2022]
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22
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Quiroga J, Cruz S, Insuasty B, Abonia R, Cobo J, Sánchez A, Nogueras M, Low JN. Synthesis and structural analysis of 5-cyanodihydropyrazolo[3,4-b]pyridines. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.5570380108] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Lipson VV, Karnozhitskaya TM, Shishkina SV, Shishkin OV, Turov AV. Reactions of α-aminoazoles with (2E)-3-phenylacryloyl chloride. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2008. [DOI: 10.1134/s1070428008110225] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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Regioselective synthesis of novel substituted pyrazolo[1,5-a]pyrimidines under solvent-free conditions. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.08.044] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Quiroga J, Portilla J, Abonía R, Insuasty B, Nogueras M, Cobo J. Regioselective synthesis of novel polyfunctionally substituted pyrazolo[1,5-a]pyrimidines under solvent-free conditions. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.041] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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26
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Tu S, Wang Q, Zhang Y, Xu J, Zhang J, Zhu X, Shi F. Design and synthesis of new and significative bifunctional compounds containing two pyrazolo[3,4-b]pyridine nucleis through multicomponent reaction under microwave irradiation. J Heterocycl Chem 2007. [DOI: 10.1002/jhet.5570440409] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Lipson VV, Borodina VV, Shirobokova MG, Desenko SM, Shishkin OV, Zubatyuk RI. Interaction of aminoazoles with Meldrum’s acid and dialkyl ketones or cyclohexanone. Chem Heterocycl Compd (N Y) 2007. [DOI: 10.1007/s10593-007-0071-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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28
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Lipson VV, Karnozhitskaya TM, Desenko SM, Shishkina SV, Shishkin OE, Musatov VI. Reactions of α-aminoazoles with diethyl benzylidenemalonate. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2007. [DOI: 10.1134/s1070428007020169] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Lipson VV, Shirobokova MG, Shishkin OV, Shishkina SV. Synthesis of partially hydrogenated pyrazolo[3,4-b]quinolinones by condensation of 3-amino-5-methylpyrazole with aromatic aldehydes and dimedone. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2006. [DOI: 10.1134/s1070428006070141] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Lipson VV, Desenko SM, Shirobokova MG, Shishkin OV, Shishkina SV. Heterocyclizations of 5-methylpyrazol-3-amine with unsaturated arylaliphatic carboxylic acid derivatives. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2006. [DOI: 10.1134/s1070428006070153] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sekhar BC. Cyclic 1,3-diones and their derivatives-As versatile reactive intermediates in the syntheses of condensed fused ring heterocyles. J Heterocycl Chem 2004. [DOI: 10.1002/jhet.5570410601] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Quiroga J, Insuasty B, Abonía R, Hernandez P, Nogueras M, Sánchez A. Synthesis of Pyrazolo[3,4-b]pyridines and Pyrido[2,3-d]pyrimidinones by Hetero-Diels-Alder Reaction of Pyrazolyl- and Pyrimidinilimines under Microwave Irradiation in Dry Media. HETEROCYCL COMMUN 2000. [DOI: 10.1515/hc.2000.6.4.345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Quiroga J, Alvarado M, Insuasty B, Moreno R, Raviña E, Estevez I, De Almeida S. RH. Synthesis of 5-cyanopyrazolo[3,4-b]pyridines in the reaction of 5-amino-3-methyl-1-phenylpyrazole with arylidene derivatives of malonodinitrile and ethyl cyanoacetate. J Heterocycl Chem 1999. [DOI: 10.1002/jhet.5570360533] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Chapter 6.2 Six-membered ring systems: Diazines and benzo derivatives. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0959-6380(99)80016-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Quiroga J, Insuasty B, Hormaza A, Gamenara D, Dominguez L, Saldaña J. Synthesis, characterization andin vitroanthelmintic activity againstNippostrongylus brasiliensisof new 5-aryl-2-phenyl-6,7-dihydropyrazolo[1,5-a]pyrimidines. J Heterocycl Chem 1999. [DOI: 10.1002/jhet.5570360102] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Quiroga J, Insuasty B, Hormaza A, Cabildo P, Claramunt R, Elguero J. SYNTHESIS, MOLECULAR STRUCTURE AND TAUTOMERISM OF 1(2)H-DIHYDROPYRAZOLO[3,4-b]PYRIDIN-6-ONES. HETEROCYCL COMMUN 1999. [DOI: 10.1515/hc.1999.5.2.115] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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