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Calabretta LO, Petri YD, Raines RT. Fluorescent Guanidinium-Azacarbazole for Oxoanion Binding in Water. J Org Chem 2023; 88:11694-11701. [PMID: 37530571 PMCID: PMC10530381 DOI: 10.1021/acs.joc.3c00982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
Oxoanions such as carboxylates, phosphates, and sulfates play important roles in both chemistry and biology and are abundant on the cell surface. We report on the synthesis and properties of a rationally designed guanidinium-containing oxoanion binder, 1-guanidino-8-amino-2,7-diazacarbazole (GADAC). GADAC binds to a carboxylate, phosphate, and sulfate in pure water with affinities of 3.6 × 104, 1.1 × 103, and 4.2 × 103 M-1, respectively. Like 2-azacarbazole, which is a natural product that enables scorpions to fluoresce, GADAC is fluorescent in water (λabs = 356 nm, λem = 403 nm, ε = 13,400 M-1 cm-1). The quantum yield of GADAC is pH-sensitive, increasing from Φ = 0.12 at pH 7.4 to Φ = 0.53 at pH 4.0 as a result of the protonation of the aminopyridine moiety. The uptake of GADAC into live human melanoma cells is detectable in the DAPI channel at low micromolar concentrations. Its properties make GADAC a promising candidate for applications in oxoanion binding and fluorescence labeling in biological (e.g., the delivery of cargo into cells) and other contexts.
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Affiliation(s)
- Lindsey O. Calabretta
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Yana D. Petri
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Ronald T. Raines
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Soleymani M, Emamian S. A molecular electron density theory study on the Chichibabin reaction: The origin of regioselectivity. J Mol Graph Model 2022; 116:108240. [PMID: 35675725 DOI: 10.1016/j.jmgm.2022.108240] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 05/26/2022] [Accepted: 05/27/2022] [Indexed: 12/14/2022]
Abstract
A Molecular Electron Density Theory (MEDT) study was performed on the nucleophilic amination of pyridine and benzene to elucidate the observed regioselectivity in the Chichibabin reaction. For this purpose, three possible reaction paths were considered between NaNH2 and the 2-, 3- and 4-positions of pyridine. The reaction of NaNH2 and benzene was also investigated. The results indicated that in each reaction, the first step involves the nucleophilic attack of the NH2‾ ion toward the aromatic system to produce an anionic intermediate. The second step, proceeds via hydride elimination of the anionic intermediate to produce the corresponding aromatic amine. This step is more favourable both kinetically and thermodynamically for the reaction at the 2-position of pyridine relative to the 4-position. In contrast to the Parr functions analysis which indicates that the 4-position is activated more electrophilically in pyridine, the PES analysis reveals that the 2-position attack with the NH2‾ ion is more favourable both thermodynamically and kinetically. The results for the reaction of sodium amide and benzene indicated that this reaction is not feasible due to the high activation barriers. In consistent with the experimental results, the ELF analysis indicated that in the first step of the reaction between pyridine and sodium amide, the formation of the C2-N bond takes place via a pseudoradical coupling between the C2 carbon atom of pyridine and the N atom of NaNH2. These variations occur in the second-half of the first step of the reaction. NCI analysis on the reaction revealed that the more attractive forces between the fragments, make the transition states for the 2-position attack more stable relative to the others. Thus, the NCI analysis can satisfactorily describe the observed regioselectivity in the Chichibabin reaction.
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Affiliation(s)
- Mousa Soleymani
- Chemistry Department, Faculty of Science, Ayatollah Boroujerdi University, Boroujerd, Iran.
| | - Saeedreza Emamian
- Chemistry Department, Shahrood Branch, Islamic Azad University, Shahrood, Iran.
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Affiliation(s)
| | | | - Shunsuke Chiba
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University
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Pozharskii AF, Ozeryanskii VA, Dyablo OV, Pogosova OG, Borodkin GS, Filarowski A. Nucleophilic Substitution of Hydrogen Atom in Initially Inactivated Pyrrole Ring. Org Lett 2019; 21:1953-1957. [PMID: 30854860 DOI: 10.1021/acs.orglett.8b04098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
It has been found that 1-dialkylamino-8-(pyrrolyl-1)naphthalenes 1 and 6, upon treatment with an equimolar amount of HBF4 under ambient conditions, produce 1-dialkylammonium salts which are transformed into 7,7-dialkyl-7 H-pyrrolo[1,2- a]perimidine-7-ium tetrafluoroborates 5 and 7, respectively. The reaction proceeds in a highly selective manner and represents the first case of nucleophilic substitution of hydrogen in the initially inactivated pyrrole ring. The scope and limitations of the transformation, apparently operating due to the joint action of the "proximity effect" and proton catalysis, are outlined.
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Affiliation(s)
- Alexander F Pozharskii
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Valery A Ozeryanskii
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Olga V Dyablo
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Olga G Pogosova
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Gennady S Borodkin
- Institute of Physical and Organic Chemistry , Southern Federal University , Stachki Ave 194/2 , 344090 Rostov-on-Don , Russian Federation
| | - Aleksander Filarowski
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland and Institute of Chemistry , St. Petersburg State University , Universitetskij pr 26 , 198504 St. Petersburg , Russian Federation
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Pang JH, Kaga A, Roediger S, Lin MH, Chiba S. Revisiting the Chichibabin Reaction: C2 Amination of Pyridines with a NaH−Iodide Composite. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900094] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jia Hao Pang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
| | - Atsushi Kaga
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
| | - Sven Roediger
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
| | - Min Htoo Lin
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
| | - Shunsuke Chiba
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
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Lewis DE. Aleksei Yevgen'evich Chichibabin (1871-1945): A Century of Pyridine Chemistry. Angew Chem Int Ed Engl 2017; 56:9660-9668. [PMID: 28605569 DOI: 10.1002/anie.201611724] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 11/06/2022]
Abstract
Tutor, journalist, patriot, and defector: Aleksei Yevgen'evich Chichibabin made seminal contributions to the chemistry of pyridines. As the Chichibabin reaction enters its second century, it is appropriate to re-examine the life of this remarkable chemist and his legacy to heterocyclic chemistry.
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Affiliation(s)
- David E Lewis
- Department of Chemistry, University of Wisconsin-Eau Claire, Eau Claire, WI, 54702-4004, USA
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Lewis DE. Alexei Jewgenjewitsch Tschitschibabin (1871–1945): ein Jahrhundert Pyridinchemie. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- David E. Lewis
- Department of ChemistryUniversity of Wisconsin-Eau Claire Eau Claire WI 54702-4004 USA
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Froidevaux V, Negrell C, Caillol S, Pascault JP, Boutevin B. Biobased Amines: From Synthesis to Polymers; Present and Future. Chem Rev 2016; 116:14181-14224. [DOI: 10.1021/acs.chemrev.6b00486] [Citation(s) in RCA: 349] [Impact Index Per Article: 43.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Vincent Froidevaux
- Institut Charles Gerhardt UMR 5253–CNRS, UM, ENSCM, 8 rue de l’Ecole Normale, F-34296 Montpellier Cedex 5, France
| | - Claire Negrell
- Institut Charles Gerhardt UMR 5253–CNRS, UM, ENSCM, 8 rue de l’Ecole Normale, F-34296 Montpellier Cedex 5, France
| | - Sylvain Caillol
- Institut Charles Gerhardt UMR 5253–CNRS, UM, ENSCM, 8 rue de l’Ecole Normale, F-34296 Montpellier Cedex 5, France
| | - Jean-Pierre Pascault
- INSA-Lyon, IMP, UMR5223, F-69621 Villeurbanne, France
- Université de Lyon, F-69622 Lyon, France
| | - Bernard Boutevin
- Institut Charles Gerhardt UMR 5253–CNRS, UM, ENSCM, 8 rue de l’Ecole Normale, F-34296 Montpellier Cedex 5, France
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Khutorianskyi VV, Sonawane M, Pošta M, Klepetářová B, Beier P. Oxidative nucleophilic aromatic amination of nitrobenzenes. Chem Commun (Camb) 2016; 52:7237-40. [PMID: 27152372 DOI: 10.1039/c6cc02235a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Nitrobenzenes substituted with electron-acceptor groups such as halogen, nitro, trifluoromethyl, pentafluorosulfanyl, or cyano underwent oxidative nucleophilic substitution with lithium salts of arylamines to afford N-aryl-2-nitroanilines.
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Affiliation(s)
- V V Khutorianskyi
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10 Prague, Czech Republic.
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Sun K, Wang X, Liu L, Sun J, Liu X, Li Z, Zhang Z, Zhang G. Copper-Catalyzed Cross-Dehydrogenative C–N Bond Formation of Azines with Azoles: Overcoming the Limitation of Oxidizing N–O Activation Strategy. ACS Catal 2015. [DOI: 10.1021/acscatal.5b02411] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Kai Sun
- College
of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
- Collaborative
Innovation Center of Henan Province for Green Manufacturing of Fine
Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Xin Wang
- College
of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
| | - Lulu Liu
- College
of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
| | - Jingjing Sun
- College
of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
| | - Xin Liu
- College
of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
| | - Zhenduo Li
- College
of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, P. R. China
| | - Zhiguo Zhang
- Collaborative
Innovation Center of Henan Province for Green Manufacturing of Fine
Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Guisheng Zhang
- Collaborative
Innovation Center of Henan Province for Green Manufacturing of Fine
Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
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Chen X, Li X, Qu Z, Ke D, Qu L, Duan L, Mai W, Yuan J, Chen J, Zhao Y. H-Phosphonate-Mediated Amination of QuinolineN-Oxides with Tertiary Amines: A Mild and Metal-Free Synthesis of 2-Dialkylaminoquinolines. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301065] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Breuker K, van Der Plas H, van Veldhuizen A. The Chichibabin Amination of 5-Phenylpyrimidine and Phenylpyrazine [1,2]. Isr J Chem 2013. [DOI: 10.1002/ijch.198600012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Pastýříková T, Iakobson G, Vida N, Pohl R, Beier P. Direct Amination of Nitro(pentafluorosulfanyl)benzenes through Vicarious Nucleophilic Substitution of Hydrogen. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200127] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Gulevskaya AV, Pozharskii AF. Nucleophilic Aromatic Substitution of Hydrogen as a Tool for Heterocyclic Ring Annulation. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 93 2007. [DOI: 10.1016/s0065-2725(06)93002-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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15
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Kiselyov AS. Reaction of N-fluoropyridinium fluoride with isonitriles: a convenient route to picolinamides. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.02.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Makosza M, Wojciechowski K. Nucleophilic Substitution of Hydrogen in Heterocyclic Chemistry. Chem Rev 2004; 104:2631-66. [PMID: 15137803 DOI: 10.1021/cr020086+] [Citation(s) in RCA: 289] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mieczysław Makosza
- Institute of Organic Chemistry, Polish Academy of Sciences, Ul. Kasprzaka 44/52, P.O. Box 58, 01-224 Warszawa 42, Poland.
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17
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van der Plas H. Oxidative Amino-Dehydrogenation of Azines. ADVANCES IN HETEROCYCLIC CHEMISTRY 2004. [DOI: 10.1016/s0065-2725(03)86001-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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18
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6,8-Dimethylpyrimido[4,5-c]pyridazine-5,7(6H,8H)-dione: new heterocyclizations based on SNH-methodology. Unexpected formation of the first iso-π-electronic analogue of the still unknown dibenzo[a,o]pycene. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.08.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Palucki M, Hughes DL, Yasuda N, Yang C, Reider PJ. A highly efficient synthesis of 2-[3-aminopropyl]-5,6,7,8-tetrahydronaphthyridine via a double Suzuki reaction and a Chichibabin cyclization. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01424-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Ma̧kosza M, Białecki M. Nitroarylamines via the Vicarious Nucleophilic Substitution of Hydrogen: Amination, Alkylamination, and Arylamination of Nitroarenes with Sulfenamides. J Org Chem 1998. [DOI: 10.1021/jo970582b] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mieczysław Ma̧kosza
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44, 01-224 Warsaw, Poland
| | - Maciej Białecki
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44, 01-224 Warsaw, Poland
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Guram AS, Rennels RA, Buchwald SL. Eine einfache katalytische Methode zur Synthese von Arylaminen aus Arylbromiden. Angew Chem Int Ed Engl 1995. [DOI: 10.1002/ange.19951071216] [Citation(s) in RCA: 155] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Kiselyov AS, Strekowski L. Carboxamidation of Pyridines by the System of Elemental Fluorine-Carbonitrile-Water: A Useful Alternative to the Chichibabin Amination. SYNTHETIC COMMUN 1994. [DOI: 10.1080/00397919408019063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Purines, pyrimidines and condensed systems based on them. 10. Reactivity of 1,3-dimethyl-6-chlorolumazine with respect to amines: Competition of aminodechlorination and aminodehydrogenation reactions. Chem Heterocycl Compd (N Y) 1992. [DOI: 10.1007/bf00531478] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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25
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Woźniak M, Barański A, Szpakiewicz B. Regioselectivity of the amination of some 3-nitropyridines by liquid ammonia/potassium permanganate. ACTA ACUST UNITED AC 1991. [DOI: 10.1002/jlac.1991199101151] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Vorbrüggen H. Advances in Amination of Nitrogen Heterocycles. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 49 1990. [DOI: 10.1016/s0065-2725(08)60554-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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27
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Reactions of Azines with Bifunctional Nucleophiles: Cyclizations and Ring Transformations. ADVANCES IN HETEROCYCLIC CHEMISTRY 1988. [DOI: 10.1016/s0065-2725(08)60256-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Belen'Kii L. The Literature of Heterocyclic Chemistry, Part III. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 44 1988. [DOI: 10.1016/s0065-2725(08)60264-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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30
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Mcgill CK, Rappa A. Advances in the Chichibabin Reaction. ADVANCES IN HETEROCYCLIC CHEMISTRY VOLUME 44 1988. [DOI: 10.1016/s0065-2725(08)60261-5] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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31
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Tondys H, Plas HCVD. Amination of 4-nitropyridazine 1-oxides by liquid ammonia/potassium permanganate. J Heterocycl Chem 1986. [DOI: 10.1002/jhet.5570230263] [Citation(s) in RCA: 16] [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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Postovskii IY, Chupakhin ON, Matern AI. Mechanism of hydride transfer in dihydropyridines and their analogs (review). Chem Heterocycl Compd (N Y) 1984. [DOI: 10.1007/bf00503590] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ponasenkova TF, Akhvlediani RN, Dikopolova VV, Suvorov NN. Pyrroloquinolines and pyrroloisoquinolines. 4. Nucleophilic substitution in the pyrroloisoquinoline series. Chem Heterocycl Compd (N Y) 1984. [DOI: 10.1007/bf00513854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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35
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Research on the chemistry of heterocycles at Rostov State University (review). Chem Heterocycl Compd (N Y) 1982. [DOI: 10.1007/bf00506604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Imidazole derivatives that contain potentially labile groupings attached to the N atom. 7. Synthesis of 1-substituted 2-aminobenzimidazoles by ammonolysis of 1-R-3-methoxybenzimidazolium salts. Chem Heterocycl Compd (N Y) 1982. [DOI: 10.1007/bf00506589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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38
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Concept of ?-deficiency in the chemistry of heteroaromatic compounds (review). Chem Heterocycl Compd (N Y) 1979. [DOI: 10.1007/bf00473831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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39
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Doron'kin VN, Pozharskii AF, Kashparov IS. Effect of benzo annelation on the Chichibabin reaction. Chem Heterocycl Compd (N Y) 1979. [DOI: 10.1007/bf00480372] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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