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Donaire-Arias A, Montagut AM, Puig de la Bellacasa R, Estrada-Tejedor R, Teixidó J, Borrell JI. 1 H-Pyrazolo[3,4- b]pyridines: Synthesis and Biomedical Applications. Molecules 2022; 27:2237. [PMID: 35408636 PMCID: PMC9000541 DOI: 10.3390/molecules27072237] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 03/16/2022] [Accepted: 03/23/2022] [Indexed: 11/29/2022] Open
Abstract
Pyrazolo[3,4-b]pyridines are a group of heterocyclic compounds presenting two possible tautomeric forms: the 1H- and 2H-isomers. More than 300,000 1H-pyrazolo[3,4-b]pyridines have been described which are included in more than 5500 references (2400 patents) up to date. This review will cover the analysis of the diversity of the substituents present at positions N1, C3, C4, C5, and C6, the synthetic methods used for their synthesis, starting from both a preformed pyrazole or pyridine, and the biomedical applications of such compounds.
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Affiliation(s)
| | | | | | | | | | - José I. Borrell
- Grup de Química Farmacèutica, IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, E-08017 Barcelona, Spain; (A.D.-A.); (A.M.M.); (R.P.d.l.B.); (R.E.-T.); (J.T.)
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2
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Synthesis of Pyrazolo-Fused 4-Azafluorenones in an Ionic Liquid. Mechanistic Insights by Joint Studies Using DFT Analysis and Mass Spectrometry. Catalysts 2019. [DOI: 10.3390/catal9100820] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of pyrazolo-fused 4-azafluorenones (indeno[1,2-b]pyrazolo[4,3-e]pyridines, IPP) were synthesized via the three-component reaction between arylaldehydes, 3-methyl-1H-pyrazol-5-amine and 1,3-indanedione in an ionic liquid as a catalyst at room temperature. The applied synthetic route has the advantages of easy work-up under mild reaction conditions presenting moderate yields and an environmentally benign procedure. A theoretical study based on conceptual-density functional theory has been done, bond reactivity indices have been calculated and an electrophilic and nucleophilic character of localized orbitals has been determined to analyze the possible electronic mechanisms.
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Abstract
The PVP and its derivatives have been broadly applied in polymers, organic
syntheses, and catalysis processes. The crosslinked PVP is a well-known polymer support
for numerous reagents and catalysts. Cross-linked PVPs are commercially available polymers
and have attracted much attention over the past due to their interesting properties
such as the facile functionalization, high accessibility of functional groups, being nonhygroscopic,
easy to prepare, easy filtration, and swelling in many organic solvents. A
brief explanation of the reported applications of PVPs in different fields followed by the
discussion on the implementation of methodologies for catalytic efficiency of PVP-based
reagents in the organic synthesis is included. The aim is to summarize the literature under
a few catalytic categories and to present each as a short scheme involving reaction conditions.
In the text, discussions on the synthesis and the structural determination of some typical polymeric reagents
are presented, and the mechanisms of some organic reactions are given. Where appropriate, advantages
of reagents in comparison with the previous reports are presented. This review does not include patent literature.
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Affiliation(s)
- Nader Ghaffari Khaligh
- Nanotechnology and Catalysis Research Center, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Hanna S. Abbo
- Department of Chemistry, University of Basrah, Basrah, Iraq
| | - Mohd Rafie Johan
- Nanotechnology and Catalysis Research Center, Institute of Postgraduate Studies, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Orrego-Hernández J, Lizarazo C, Cobo J, Portilla J. Pyrazolo-fused 4-azafluorenones as key reagents for the synthesis of fluorescent dicyanovinylidene-substituted derivatives. RSC Adv 2019; 9:27318-27323. [PMID: 35529179 PMCID: PMC9070601 DOI: 10.1039/c9ra04682h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Accepted: 08/24/2019] [Indexed: 12/21/2022] Open
Abstract
A green method for the three-component synthesis of an indeno[1,2-b]pyrazolo[4,3-e]pyridines library under microwave irradiation and their use in the preparation of novel fluorescent dicyanovinylidene-substituted derivatives is provided.
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Affiliation(s)
- Jessica Orrego-Hernández
- Bioorganic Compounds Research Group
- Department of Chemistry
- Universidad de los Andes
- Bogotá 111711
- Colombia
| | - Carolina Lizarazo
- Bioorganic Compounds Research Group
- Department of Chemistry
- Universidad de los Andes
- Bogotá 111711
- Colombia
| | - Justo Cobo
- Departamento de Química Orgánica e Inorgánica
- Universidad de Jaén
- 23071 Jaén
- Spain
| | - Jaime Portilla
- Bioorganic Compounds Research Group
- Department of Chemistry
- Universidad de los Andes
- Bogotá 111711
- Colombia
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5
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Shaabani A, Nazeri MT, Afshari R. 5-Amino-pyrazoles: potent reagents in organic and medicinal synthesis. Mol Divers 2018; 23:751-807. [PMID: 30552550 DOI: 10.1007/s11030-018-9902-8] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 12/04/2018] [Indexed: 12/31/2022]
Abstract
5-Amino-pyrazoles have proven to be a class of fascinating and privileged organic tools for the construction of diverse heterocyclic or fused heterocyclic scaffolds. This review presents comprehensively the applications of 5-amino-pyrazoles as versatile synthetic building blocks in the synthesis of remarkable organic molecules with an emphasis on versatile functionalities. Following a brief introduction of synthesis methods, planning strategies to construct organic compounds, particularly diverse heterocyclic scaffolds, such as poly-substituted heterocyclic compounds and fused heterocyclic compounds via 5-amino-pyrazoles, have been summarized. Fused heterocycles are classified as bicyclic, tricyclic, tetracyclic, and spiro-fused pyrazole derivatives. These outstanding compounds synthesized via wide variety of approaches include conventional reactions, one-pot multi-component reactions, cyclocondensation, cascade/tandem protocols, and coupling reactions. 5-Amino-pyrazoles represent a class of promising functional reagents, similar to the biologically active compounds, highlighted with diverse applications especially in the field of pharmaceutics and medicinal chemistry. Notably, this critical review covers the articles published from 1981 to 2018.
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Affiliation(s)
- Ahmad Shaabani
- Faculty of Chemistry, Shahid Beheshti University, G. C., P. O. Box 19396-4716, Tehran, Iran.
| | - Mohammad Taghi Nazeri
- Faculty of Chemistry, Shahid Beheshti University, G. C., P. O. Box 19396-4716, Tehran, Iran
| | - Ronak Afshari
- Faculty of Chemistry, Shahid Beheshti University, G. C., P. O. Box 19396-4716, Tehran, Iran
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6
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Murlykina MV, Morozova AD, Zviagin IM, Sakhno YI, Desenko SM, Chebanov VA. Aminoazole-Based Diversity-Oriented Synthesis of Heterocycles. Front Chem 2018; 6:527. [PMID: 30555815 PMCID: PMC6282055 DOI: 10.3389/fchem.2018.00527] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 10/11/2018] [Indexed: 02/02/2023] Open
Abstract
The comprehensive review contains the analysis of literature data concerning reactions of heterocyclization of aminoazoles and demonstrates the application of these types of transformations in diversity-oriented synthesis. The review is oriented to wide range of chemists working in the field of organic synthesis and both experimental and theoretical studies of nitrogen-containing heterocycles.
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Affiliation(s)
- Maryna V Murlykina
- Department of Organic and Bioorganic Chemistry, State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine (NAS), Kharkiv, Ukraine
| | - Alisa D Morozova
- Department of Organic and Bioorganic Chemistry, State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine (NAS), Kharkiv, Ukraine
| | - Ievgen M Zviagin
- Department of Organic and Bioorganic Chemistry, State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine (NAS), Kharkiv, Ukraine
| | - Yana I Sakhno
- Department of Organic and Bioorganic Chemistry, State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine (NAS), Kharkiv, Ukraine
| | - Sergey M Desenko
- Department of Organic and Bioorganic Chemistry, State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine (NAS), Kharkiv, Ukraine.,Chemistry Faculty, Karazin Kharkiv National University, Kharkiv, Ukraine
| | - Valentyn A Chebanov
- Department of Organic and Bioorganic Chemistry, State Scientific Institution "Institute for Single Crystals", National Academy of Sciences of Ukraine (NAS), Kharkiv, Ukraine.,Chemistry Faculty, Karazin Kharkiv National University, Kharkiv, Ukraine
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7
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Advancements in tetronic acid chemistry. Part 2: Use as a simple precursor to privileged heterocyclic motifs. Mol Divers 2016; 20:989-999. [DOI: 10.1007/s11030-016-9683-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 06/06/2016] [Indexed: 11/26/2022]
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8
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Asadi S, Ziarani GM. The molecular diversity scope of 1,3-indandione in organic synthesis. Mol Divers 2016; 20:111-152. [PMID: 25957619 DOI: 10.1007/s11030-015-9589-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Accepted: 03/25/2015] [Indexed: 11/30/2022]
Abstract
Indandione is an important starting material that has drawn great attention in various organic transformations because of its attributes, such as low cost, easy to handle and eco-friendliness generally affording the corresponding products in excellent yields. In this review, we summarize recent data describing the most important MCRs reactions in which one of the starting materials is indandione. This review will also present two-, three-, four-, and five-component and one-pot reactions for the functionalization of indandione with the to increase awareness on the versatility of using this compound among organic chemists.
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Affiliation(s)
- Shima Asadi
- Department of Chemistry, School of Sciences, Alzahra University, Vanak, Tehran, Iran
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9
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Petrova ON, Lipson VV, Zamigailo LL, Shirobokova MG, Musatov VI, Baumer VN, Sofronov DS. Synthesis and chemical properties of 4-aroyl-3-methyl-4,10-dihydroindeno[1,2-b]pyrazolo-[4,3-e]pyridin-5-ones. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2015. [DOI: 10.1134/s1070428015110147] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Khaligh NG. Introduction 1,1′-butylenebis(3-methyl-3H imidazol-1-ium) Hydrogen Sulfate as an Efficient Binuclear Brönsted Acidic Ionic Liquid for Three-Component and One-Pot Synthesis of Benzo[f]indenoquinoline Derivatives. Polycycl Aromat Compd 2015. [DOI: 10.1080/10406638.2014.935448] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Xu BH, Tu MS, Liu YP, Jiang B, Wang XH, Tu SJ. Microwave-Assisted Three-Component Reactions Leading to Pyrano-Fused Pyrazolo[3,4- b]pyridines. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.1597] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bi-Hui Xu
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Xuzhou Normal University; Xuzhou Jiangsu 221116 China
| | - Man-Su Tu
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Xuzhou Normal University; Xuzhou Jiangsu 221116 China
| | - Yin-Ping Liu
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Xuzhou Normal University; Xuzhou Jiangsu 221116 China
| | - Bo Jiang
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Xuzhou Normal University; Xuzhou Jiangsu 221116 China
| | - Xing-Hang Wang
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Xuzhou Normal University; Xuzhou Jiangsu 221116 China
| | - Shu-Jiang Tu
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Xuzhou Normal University; Xuzhou Jiangsu 221116 China
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12
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13
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Allais C, Grassot JM, Rodriguez J, Constantieux T. Metal-Free Multicomponent Syntheses of Pyridines. Chem Rev 2014; 114:10829-68. [DOI: 10.1021/cr500099b] [Citation(s) in RCA: 363] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Christophe Allais
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397 MARSEILLE, France
| | - Jean-Marie Grassot
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397 MARSEILLE, France
| | - Jean Rodriguez
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397 MARSEILLE, France
| | - Thierry Constantieux
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397 MARSEILLE, France
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14
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3-Methyl-1-sulfonic acid imidazolium hydrogen sulfate-catalyzed three-component, one-pot synthesis of 13-aryl-12H-benzo[f]indeno[1,2-b]quinoline-12-one derivatives. RESEARCH ON CHEMICAL INTERMEDIATES 2014. [DOI: 10.1007/s11164-014-1642-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Khaligh NG. Three-component, one-pot synthesis of benzo[f]indenoquinoline derivatives catalyzed by poly(4-vinylpyridinium) hydrogen sulfate. CHINESE JOURNAL OF CATALYSIS 2014. [DOI: 10.1016/s1872-2067(12)60752-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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An Efficient Synthesis of Isoxazoles and Pyrazoles under Ultrasound Irradiation. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Wu LQ, Dong RY, Yang CG, Yan FL. Synthesis of 4-Aryl-3-Methyl-1-Phenyl-1H-Benzo[h]Pyrazolo[3,4-b]Quinoline-5,10-diones Using Diammonium Hydrogen Phosphate as an Efficient and Versatile Catalyst in Water. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201000003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Shi DQ, Li Y, Wang HY. Synthesis of Indeno[2′,1′:5,6]pyrido[2,3-d]pyrimidine Derivatives and Their Recognition Properties as New Type Anion Receptors. J Heterocycl Chem 2012. [DOI: 10.1002/jhet.941] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Da-Qing Shi
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou; 215123; People's Republic of China
| | - Yan Li
- School of Chemistry and Chemical Engineering; Xuzhou Normal University; Xuzhou; 221116; People's Republic of China
| | - Hai-Ying Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; Suzhou; 215123; People's Republic of China
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19
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Eckert H. Diversity oriented syntheses of conventional heterocycles by smart multi component reactions (MCRs) of the last decade. Molecules 2012; 17:1074-102. [PMID: 22267194 PMCID: PMC6268852 DOI: 10.3390/molecules17011074] [Citation(s) in RCA: 133] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 01/11/2012] [Accepted: 01/12/2012] [Indexed: 11/16/2022] Open
Abstract
A collection of smart multicomponent reactions (MCRs) with continuative post condensation cyclizations (PCCs) is presented to construct conventional three- to seven-membered heterocyclic compounds in diversity oriented syntheses (DOS). These will provide a high degree of applying economical and ecological advantages as well as of practicability. Water, ionic liquids, and solvent-less syntheses as well as use of various forms of energy as microwave and ultrasonic irradiation are examined and discussed.
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Affiliation(s)
- Heiner Eckert
- Department Chemie, Technische Universität München, Lichtenbergstr. 4, Garching 85747, Germany.
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20
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Wang JX, Shen GL, Shi DQ. An efficient three-component synthesis of hexahydroquinoline derivatives in ionic liquid. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.703] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Shi DQ, Zou Y, Hu Y, Wu H. Improved synthesis of dihydrothiophenes derivatives under ultrasound irradiation. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.662] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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22
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Liu H, Zou Y, Hu Y, Shi DQ. An efficient one-pot synthesis of dispiropyrrolidine derivatives through 1,3-dipolar cycloaddition reactions under ultrasound irradiation. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.654] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Huang Z, Hu Y, Zhou Y, Shi D. Efficient one-pot three-component synthesis of fused pyridine derivatives in ionic liquid. ACS COMBINATORIAL SCIENCE 2011; 13:45-9. [PMID: 21247124 DOI: 10.1021/co1000162] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient one-pot synthesis of fused pyridine derivatives (including pyrazolo[3,4-b]pyridine and pyrido[2,3-d]pyrimidine) by three-component reaction of aldehyde, acyl acetonitrile, and electron-rich amino heterocycles (including aminopyrazole and aminouracils) in ionic liquid is reported. This new protocol has the advantages of environmental friendliness, higher yields, shorter reaction times, and convenient operation.
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Affiliation(s)
- Zhibin Huang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Yu Hu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Yao Zhou
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Daqing Shi
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
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Isambert N, Sanchez Duque MDM, Plaquevent JC, Génisson Y, Rodriguez J, Constantieux T. Multicomponent reactions and ionic liquids: a perfect synergy for eco-compatible heterocyclic synthesis. Chem Soc Rev 2011; 40:1347-57. [PMID: 20963207 DOI: 10.1039/c0cs00013b] [Citation(s) in RCA: 303] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Nicolas Isambert
- Aix-Marseille Université-Institut des Sciences Moléculaires de Marseille-UMR CNRS 6263 iSm2, Centre Saint Jérôme, Service 531, 13397, Marseille Cedex 20, France
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Shi DQ, Yang F. An efficient synthesis of pyrazolo[3,4-b]quinolin-5(6H)-one derivatives in ionic liquid. J Heterocycl Chem 2010. [DOI: 10.1002/jhet.538] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Wang S, Ma N, Zhang G, Shi F, Jiang B, Lu H, Gao Y, Tu S. An efficient and clean synthesis of indeno[1,2-b]pyrazolo[4,3-e] pyridin-5(1H)-one derivatives under microwave irradiation in water. J Heterocycl Chem 2010. [DOI: 10.1002/jhet.468] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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27
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Shi DQ, Zhou Y, Liu H. An efficient synthesis of pyrido[2,3- d]pyrimidine derivatives in ionic liquid. J Heterocycl Chem 2010. [DOI: 10.1002/jhet.281] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Shi DQ, Yao H. Clean synthesis of furo[3,4-e]pyrazolo[3,4-b]pyridine-5-one derivatives in aqueous media. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.224] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Valizadeh H, Fakhari A. Facile, efficient, and eco-friendly synthesis of benzo[b]pyran-2-imines over MgO and transformation to the coumarin derivatives. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.265] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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