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Maraf MB, Idrice AA, Mekoung Pélagie MA, Zintchem AAA, Bebga G, Rhyman L, Ibrahim MN, Ramasami P. Decoding the reaction mechanism of the cyclocondensation of ethyl acetate2-oxo-2-(4-oxo-4H-pyrido [1.2-a] pyrimidin-3-yl) polyazaheterocycle and ethylenediamine using bond evolution theory. J Comput Chem 2022; 43:972-985. [PMID: 35383996 DOI: 10.1002/jcc.26853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 02/05/2022] [Accepted: 02/28/2022] [Indexed: 11/12/2022]
Abstract
We investigated the flow of electron density along the cyclocondensation reaction between ethyl acetate 2-oxo-2-(4-oxo-4H-pyrido[1.2-a]pyrimidin-3-yl) polyazaheterocycle (1) and ethylenediamine (2) at the ωB97XD/6-311++G(d,p)computational method within of bond evolution theory (BET). The exploration of potential energy surface shows that this reaction has three channels (1-3) with the formation of product 3 via channel-2 (the most favorable one) as the main product and this is in good agreement with experimental observations. The BET analysis allows identifying unambiguously the main chemical events happening along channel-2. The mechanism along first step (TS2-a) is described by a series of four structural stability domains (SSDs), while five SSDs for the last two steps (TS2-b and TS2-c). The first and third steps can be summarized as follows, the formation of N1-C6 bond (SSD-II), then, the restoration of the nitrogen N1 lone pair (SSD-III), and finally, the formation of the last O1-H1 bond (SSD-IV). For the second step, the formation of hydroxide ion is noted, as a result of the disappearance of V(C6,O7) basin and the transformation of C6-N1 single bond into double one (SSD-IV). Finally, the appearance of V(O7,H2) basin lead to the elimination of water molecule within the last domain is observed.
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Affiliation(s)
- Mbah Bake Maraf
- Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Adjieufack Abel Idrice
- Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon.,Laboratory of Theoretical Chemistry (LCT) and Namur Institute of Structured Matter (NISM), University of Namur, Namur, Belgium
| | - Manwal A Mekoung Pélagie
- Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.,Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Auguste Abouem A Zintchem
- Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Gouet Bebga
- Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Lydia Rhyman
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
| | - Mbouombouo Ndassa Ibrahim
- Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Ponnadurai Ramasami
- Computational Chemistry Group, Department of Chemistry, Faculty of Science, University of Mauritius, Réduit, Mauritius.,Centre for Natural Product Research, Department of Chemical Sciences, University of Johannesburg, Doornfontein, South Africa
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Kolesnik IА, Petkevich SK, Kurman PV, Lyakhov AS, Ivashkevich LS, Zhou H, Potkin VI. Synthesis and Structure of 2-Arylamino-Substituted 4-(Dichloromethylidene)-3-Nitro-4h-Pyrido[1,2-a]Pyrimidines. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02796-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhou X, Huang F, Tang C, Zhuo Q, Chen Z, Zhang H, Xia H. A missing member of conjugated N-heterocycles: realizing pyrido[1,2-α]azepine by reacting ruthenium alkenylcarbene complex with alkyne. Chem Commun (Camb) 2018; 54:4009-4012. [PMID: 29617019 DOI: 10.1039/c8cc00758f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Despite the excellent chemical properties of N-heterocycles, pyrido[1,2-α]azepine remains elusive due to its potential antiaromaticity and lability. Herein, we demonstrate the synthesis and characterization of the first bicyclic pyrido[1,2-α]azepine that leverages the coordination to the ruthenium center to promote the stability of N-bridged bicycle.
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Affiliation(s)
- Xiaoxi Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
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Cui SS, Huang R, Luo DY, Yan SJ, Lin J. Selective Synthesis of Highly Functionalized Bicyclic Pyridinone and 1,3-Oxazinane Derivatives. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700283] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Shi-Sheng Cui
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University); Ministry of Education; School of Chemical Science and Technology; Yunnan University; 650091 Kunming P. R. China
| | - Rong Huang
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University); Ministry of Education; School of Chemical Science and Technology; Yunnan University; 650091 Kunming P. R. China
| | - Da-Yun Luo
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University); Ministry of Education; School of Chemical Science and Technology; Yunnan University; 650091 Kunming P. R. China
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University); Ministry of Education; School of Chemical Science and Technology; Yunnan University; 650091 Kunming P. R. China
| | - Jun Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University); Ministry of Education; School of Chemical Science and Technology; Yunnan University; 650091 Kunming P. R. China
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5
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Campos PT, Rodrigues LV, Belladona AL, Bender CR, Bitencurt JS, Rosa FA, Back DF, Bonacorso HG, Zanatta N, Frizzo CP, Martins MAP. Regiochemistry of cyclocondensation reactions in the synthesis of polyazaheterocycles. Beilstein J Org Chem 2017; 13:257-266. [PMID: 28326135 PMCID: PMC5331339 DOI: 10.3762/bjoc.13.29] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 01/30/2017] [Indexed: 11/23/2022] Open
Abstract
The syntheses of several polyazaheterocycles are demonstrated. The cyclocondensation reactions between β-enaminodiketones [CCl3C(O)C(=CNMe2)C(O)-CO2Et] and aromatic amidines resulted in glyoxalate-substituted pyrido[1,2-a]pyrimidinone, thiazolo[3,2-a]pyrimidinone and pyrimido[1,2-a]benzimidazole. Pyrazinones and quinoxalinones were obtained through the reaction of these glyoxalates with ethylenediamine and 1,2-phenylenediamine derivatives. On the other hand, the reaction of glyoxalates with amidines did not lead to the formation of imidazolones, but rather N-acylated products were obtained. All the products were isolated in good yields. DFT-B3LYP calculations provided HOMO/LUMO coefficients, charge densities, and the stability energies of the intermediates, and from these data it was possible to explain the regiochemistry of the products obtained. Additionally, the data were a useful tool for elucidating the reaction mechanisms.
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Affiliation(s)
- Patrick T Campos
- IFSul Campus de Pelotas, Instituto Federal de Educação, Ciência e Tecnologia Sul-Rio-Grandense, 96.015-360, Pelotas, RS, Brazil
| | - Leticia V Rodrigues
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Andrei L Belladona
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Caroline R Bender
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Juliana S Bitencurt
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Fernanda A Rosa
- Departamento de Química, Centro de Ciências Exatas, Universidade Estadual de Maringá, 87020-900,Maringa, PR, Brazil
| | - Davi F Back
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
| | - Helio G Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Clarissa P Frizzo
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
| | - Marcos A P Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97.105-900, Santa Maria, RS, Brazil
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Bui HTB, Vo DD, Chau YNT, Tu CTK, Mai HV, Truong KV. Facile Synthesis of 4-Oxo-4H-quinolizine-2-carboxamide Derivatives. SYNTHETIC COMMUN 2015. [DOI: 10.1080/00397911.2015.1112918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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7
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Christmann M, Hu J, Kitamura M, Stoltz B. Tetrahedron reports on organic chemistry. Tetrahedron 2015. [DOI: 10.1016/s0040-4020(15)00744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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8
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Rosas-Sánchez A, Toscano RA, López-Cortés JG, Ortega-Alfaro MC. An expedient approach to synthesize fluorescent 3-substituted 4H-quinolizin-4-ones via (η4-vinylketene)-Fe(CO)3 complexes. Dalton Trans 2015; 44:578-90. [DOI: 10.1039/c4dt03021d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
From simple starting materials, an efficient methodology for the synthesis of 3-substituted 4H-quinolizin-4-ones using (η4-vinylketene)-Fe(CO)3 complexes as key intermediates was developed. Fluorescent properties and quantum yields were determined.
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Affiliation(s)
| | - Rubén A. Toscano
- Instituto de Química
- UNAM
- Circuito Exterior
- Ciudad Universitaria
- México
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Palladium(II)-catalyzed cyclization of heterocyclic ketene aminals with (E)-ethyl 2,3-diiodoacrylates: selective synthesis of bicyclic pyrroles and bicyclic pyridones. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.05.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2013. [DOI: 10.1016/s0040-4020(13)01252-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Zhang Z, Zhang P, Kang T, Zhu M. Microwave Irradiation for Accelerating Synthesis of Diarylimidizo[1,5-a]pyrimidine Based on Isoflavones. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201100405] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Synthesis of quinolizin-2-one and pyrido[1,2-a]azepin-2-one derivatives from difluoroboron complexes of aroylacetones and O-methyllactims. Russ Chem Bull 2011. [DOI: 10.1007/s11172-011-0308-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Hamama WS, Ismail MA, Soliman M, Shaaban S, Zoorob HH. Behavior of 2-iminothiazolidin-4-one with different reagents. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.628] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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14
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2011. [DOI: 10.1016/s0040-4020(11)00770-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2010. [DOI: 10.1016/s0040-4020(10)01735-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Zhang ZT, Liang Y, Ma YQ, Xue D, Yang JL. One-step synthesis of diarylpyrazolo[3,4-b]pyridines from isoflavones. ACTA ACUST UNITED AC 2010; 12:600-3. [PMID: 20524639 DOI: 10.1021/cc1000506] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new concise, facile, and efficient method for the synthesis of 3-hydroxy-5,6-diphenylpyrazolo[3,4-b]pyridine derivatives has been described. The cyclocondensation of isoflavones with 3-amino-5-hydroxypyrazole in the presence of sodium methoxide gave fused heteroaromatic 3-hydroxy-5,6-diphenylpyrazolo[3,4-b]pyridines in moderate to good yields.
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Affiliation(s)
- Zun-Ting Zhang
- Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest of China, PR China.
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Zhang A, Zheng X, Fan J, Shen W. Synthesis of imidazo[1,5-a]pyridines from 1,1-dibromo-1-alkenes. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2009.12.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hamdy NA, Gamal-Eldeen AM, Abdel-Aziz HA, Fakhr IM. Modulation of carcinogen metabolizing enzymes by new fused heterocycles pendant to 5,6,7,8-tetrahydronaphthalene derivatives. Eur J Med Chem 2010; 45:463-70. [DOI: 10.1016/j.ejmech.2009.10.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2009] [Accepted: 10/15/2009] [Indexed: 10/20/2022]
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Al-Omran FA, El-Khair AA. Studies withS-alkylpyrimidine: New route for the synthesis derivatives of isoxazol, pyrazolo[1,5-a]pyrimidine, pyridazine, pyridine, thieno[2,3-b]pyridine and thiophene of potential anti-HIV. J Heterocycl Chem 2008. [DOI: 10.1002/jhet.5570450417] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Tetrahedron reports on organic chemistry. Tetrahedron 2008. [DOI: 10.1016/s0040-4020(08)00897-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Shaabani A, Rezayan AH, Sarvary A, Khavasi HR. A novel pyridine-based three-component condensation reaction: synthesis of highly substituted quinolizines. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.01.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ismail MA, Arafa RK, Wenzler T, Brun R, Tanious FA, Wilson WD, Boykin DW. Synthesis and antiprotozoal activity of novel bis-benzamidino imidazo[1,2-a]pyridines and 5,6,7,8-tetrahydro-imidazo[1,2-a]pyridines. Bioorg Med Chem 2007; 16:683-91. [PMID: 17976993 DOI: 10.1016/j.bmc.2007.10.042] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2007] [Revised: 10/08/2007] [Accepted: 10/12/2007] [Indexed: 11/25/2022]
Abstract
The key dinitrile intermediates 4a-d were synthesized by reaction of phenacyl bromide 1 and the appropriate 2-amino-5-bromopyridines to yield 3a-d. Suzuki coupling of 3a-d with 4-cyanophenylboronic acid yielded the 2,6-bis(4-cyanophenyl)-imidazo[1,2-a]pyridine derivatives 4a-d. The bis-amidoximes 5a-d, obtained from 4a-d by the action of hydroxylamine, were converted to the bis-O-acetoxyamidoximes which on catalytic hydrogenation in a mixture of ethanol/ethyl acetate gave the acetate salts of 2,6-bis[4-(amidinophenyl)]-imidazo[1,2-a]pyridines 7a-d. In contrast, catalytic hydrogenation of the bis-O-acetoxyamidoxime of 5a in glacial acetic acid gave the saturated analogue 2,6-bis[4-(amidinophenyl)]-5,6,7,8-tetrahydro-imidazo[1,2-a]pyridine 8. O-Methylation of the amidoximes 5a-d gave the N-methoxyamidines 6a-d. The diamidines showed strong DNA binding affinity, were very active in vitro against T. b. r. exhibiting IC(50) values between 7 and 38nM, but were less effective against P. f. with IC(50) values between 23 and 92nM. Two of the diamidines 7c and 7d were slightly more active than furamidine but less active than azafuramidine in the T. b. r. STIB900 mouse model. Only one prodrug 6b showed moderate activity in the same mouse model.
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Affiliation(s)
- Mohamed A Ismail
- Department of Chemistry and Center for Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303-3083, USA
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Tetrahedron reports on organic chemistry. Tetrahedron 2007. [DOI: 10.1016/s0040-4020(07)01371-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Tetrahedron reports on organic chemistry. Tetrahedron 2007. [DOI: 10.1016/s0040-4020(07)00834-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Tetrahedron reports on organic chemistry. Tetrahedron 2007. [DOI: 10.1016/s0040-4020(07)00205-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lectka T, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2006. [DOI: 10.1016/s0040-4020(06)01801-1] [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]
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Hamama WS, El-Magid OMA, Zoorob HH. Chemistry of quinuclidines as nitrogen bicyclic bridged-ring structures. J Heterocycl Chem 2006; 43:1397-1420. [DOI: 10.1002/jhet.5570430601] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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29
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Lectka T, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2006. [DOI: 10.1016/s0040-4020(06)00771-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Belen’kii L, Gramenitskaya V, Evdokimenkova Y. The Literature of Heterocyclic Chemistry, Part IX, 2002–2004. ADVANCES IN HETEROCYCLIC CHEMISTRY 2006. [DOI: 10.1016/s0065-2725(06)92004-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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31
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2004. [DOI: 10.1016/s0040-4020(04)01396-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ismail MA, Brun R, Wenzler T, Tanious FA, Wilson WD, Boykin DW. Novel dicationic imidazo[1,2-a]pyridines and 5,6,7,8-tetrahydro-imidazo[1,2-a]pyridines as antiprotozoal agents. J Med Chem 2004; 47:3658-64. [PMID: 15214792 DOI: 10.1021/jm0400092] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
2-[5-(4-Amidinophenyl)-furan-2-yl]-5,6,7,8-tetrahydro-imidazo[1,2-a]pyridine-6-carboxamidine acetate salt (7) was synthesized from 2-[5-(4-cyanophenyl)-furan-2-yl]-imidazo[1,2-a]pyridine-6-carbonitrile (4a), through the bis-O-acetoxyamidoxime followed by hydrogenation in glacial acetic acid. Compound 4a was obtained in four steps starting with two successive brominations of 2-acetylfuran first with N-bromosuccinimide, and second with bromine to form alpha-bromo-2-acetyl-5-bromofuran (2) in a moderate yield. The product (3a), of the condensation reaction between 6-amino-nicotinonitrile and 2, undergoes Suzuki coupling with 4-cyanophenylboronic acid to furnish 4a in good yield. Acetate salt of 2-[5-(4-amidinophenyl)-furan-2-yl]-imidazo[1,2-a]pyridine-6-carboxamidine (8a) was obtained from 4a, through the bis-O-acetoxyamidoxime followed by hydrogenation in a mixture of ethanol/ethyl acetate. N-Methoxy-2-(5-[4-(N-methoxyamidino)-phenyl]-furan-2-yl)-imidazo[1,2-a]pyridine-6-carboxamidine (6) was prepared via methylation of the respective diamidoxime 5a with dimethyl sulfate. By these approaches eight new diamidines and four potential prodrugs were prepared. All of the diamidines showed strong DNA affinities as judged by high DeltaT(m) values. Six of the eight diamidines gave in vitro IC(50) values of 63 nM or less vs T. b. rhodesiense with two exhibiting values of 6 nM and 1 nM. Also, six of the eight diamidines gave in vitro IC(50) values of 88 nM or less vs P. falciparum with two exhibiting values of 14 nM. Excellent in vivo activity in the trypanosomal STIB900 mouse model was found for five of the diamidines on ip dosage; these compounds gave 4/4 cures in this model. The oral activity of the prodrugs was modest with only one showing 2/4 cures in the same mouse model.
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Affiliation(s)
- Mohamed A Ismail
- Department of Chemistry and Center for Biotechnology and Drug Design, Georgia State University, Atlanta, GA 30303-3083, USA
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Tetrahedron reports on organic chemistry. Tetrahedron 2004. [DOI: 10.1016/s0040-4020(04)00315-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)01884-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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35
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)01130-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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36
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00841-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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37
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Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00323-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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38
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Palacios F, Alonso C, Rubiales G, Tobillas C, María Ezpeleta J. [4+2] Cycloaddition Reactions of Neutral 2-Azadienes with Electron-deficient Dienophiles. HETEROCYCLES 2003. [DOI: 10.3987/com-03-s65] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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39
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Posner G, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01503-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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