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Koning N, Strand D. A C-H Activation Approach to the Tricyclic Core of Glionitrin A and B. ACS OMEGA 2022; 7:12329-12341. [PMID: 35449932 PMCID: PMC9016890 DOI: 10.1021/acsomega.2c00810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
Synthesis of diketopiperazines has been of long-standing interest in both natural product synthesis and medicinal chemistry. Here, we present an operationally convenient and efficient approach to the fused indoline-diketopiperazine tricyclic core of glionitrin A/B and related structures using a Pd-catalyzed C-H activation reaction to form the indoline five-membered ring. Exploratory work aimed at elaborating the tricyclic structures into the corresponding natural products is discussed.
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3
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Pyridinesilver Tetraoxometallate Complexes: Overview of the Synthesis, Structure, and Properties of Pyridine Complexed AgXO4 (X = Cl, Mn, Re) Compounds. INORGANICS 2021. [DOI: 10.3390/inorganics9110079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We reviewed the synthesis, structure, and properties of pyridine complexes of AgXO4 (X = Cl, Mn, and Re) compounds with various compositions ([AgPy2] XO4, [AgPy2XO4]·0.5Py, [AgPy4] XO4, and 4 [AgPy2XO4] [AgPy4] XO4). We also clarified the controversial information about the existence and composition of pyridine complexes of silver permanganate, used widely as mild and selective oxidants in organic chemistry. We discussed in detail the available structural and spectroscopic (IR, Raman, and UV) data and thermal behavior, including the existence and consequence of quasi-intramolecular reactions between the reducing ligand and anions containing oxygen.
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4
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Ryazantsev MN, Strashkov DM, Nikolaev DM, Shtyrov AA, Panov MS. Photopharmacological compounds based on azobenzenes and azoheteroarenes: principles of molecular design, molecular modelling, and synthesis. RUSSIAN CHEMICAL REVIEWS 2021. [DOI: 10.1070/rcr5001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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5
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Kilgore HR, Olsson CR, D'Angelo KA, Movassaghi M, Raines RT. n→π* Interactions Modulate the Disulfide Reduction Potential of Epidithiodiketopiperazines. J Am Chem Soc 2020; 142:15107-15115. [PMID: 32701272 DOI: 10.1021/jacs.0c06477] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Epithiodiketopiperazines (ETPs) are a structurally complex class of fungal natural products with potent anticancer activity. In ETPs, the diketopiperazine ring is spanned by a disulfide bond that is constrained in a high-energy eclipsed conformation. We employed computational, synthetic, and spectroscopic methods to investigate the physicochemical attributes of this atypical disulfide bond. We find that the disulfide bond is stabilized by two n→π* interactions, each with large energies (3-5 kcal/mol). The n→π* interactions in ETPs make disulfide reduction much more difficult, endowing stability in physiological environments in a manner that could impact their biological activity. These data reveal a previously unappreciated means to stabilize a disulfide bond and highlight the utility of the n→π* interaction in molecular design.
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Affiliation(s)
- Henry R Kilgore
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Chase R Olsson
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Kyan A D'Angelo
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Mohammad Movassaghi
- 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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6
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Pariyar GC, Kundu T, Mitra B, Mukherjee S, Ghosh P. Ethyl lactate: An Efficient Green Mediator for Transition Metal Free Synthesis of Symmetric and Unsymmetric Azobenzenes. ChemistrySelect 2020. [DOI: 10.1002/slct.202002629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Gyan Chandra Pariyar
- Department of Food TechnologyUniversity of North Bengal Dist. Darjeeling West Bengal India
| | - Tandra Kundu
- Department of ChemistryUniversity of North Bengal Dist. Darjeeling West Bengal India 2776381
| | - Bijeta Mitra
- Department of ChemistryUniversity of North Bengal Dist. Darjeeling West Bengal India 2776381
| | - Suvodip Mukherjee
- Department of ChemistryUniversity of North Bengal Dist. Darjeeling West Bengal India 2776381
| | - Pranab Ghosh
- Department of ChemistryUniversity of North Bengal Dist. Darjeeling West Bengal India 2776381
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7
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Khairullin RA, Gazizov MB, Kirillina YS, Ivanova SY, Khairullina OD, Gazizova KS. Synthesis of Phthalic Aldehyde and Its Diacetals. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219110021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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New methods to synthesize phthalaldehyde and its diacetals. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2640-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Kovács GB, May NV, Bombicz PA, Klébert S, Németh P, Menyhárd A, Novodárszki G, Petrusevski V, Franguelli FP, Magyari J, Béres K, Szilágyi IM, Kótai L. An unknown component of a selective and mild oxidant: structure and oxidative ability of a double salt-type complex having κ 1O-coordinated permanganate anions and three- and four-fold coordinated silver cations. RSC Adv 2019; 9:28387-28398. [PMID: 35529631 PMCID: PMC9071043 DOI: 10.1039/c9ra03230d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 08/21/2019] [Indexed: 12/30/2022] Open
Abstract
Compounds containing redox active permanganate anions and complexed silver cations with reducing pyridine ligands are used not only as selective and mild oxidants in organic chemistry but as precursors for nanocatalyst synthesis in low-temperature solid-phase quasi-intramolecular redox reactions. Here we show a novel compound (4Agpy2MnO4·Agpy4MnO4) that has unique structural features including (1) four coordinated and one non-coordinated permanganate anion, (2) κ1O-permanganate coordinated Ag, (3) chain-like [Ag(py)2]+ units, (4) non-coordinated ionic permanganate ions and an [Ag(py)4]+ tetrahedra as well as (5) unsymmetrical hydrogen bonds between pyridine α-CHs and a permanganate oxygen. As a result of the oxidizing permanganate anion and reducing pyridine ligand, a highly exothermic reaction occurs at 85 °C. If the decomposition heat is absorbed by alumina or oxidation-resistant organic solvents (the solvent absorbs the heat to evaporate), the decomposition reaction proceeds smoothly and safely. During heating of the solid material, pyridine is partly oxidized into carbon dioxide and water; the solid phase decomposition end product contains mainly metallic Ag, Mn3O4 and some encapsulated carbon dioxide. Surprisingly, the enigmatic carbon-dioxide is an intercalated gas instead of the expected chemisorbed carbonate form. The title compound is proved to be a mild and efficient oxidant toward benzyl alcohols with an almost quantitative yield of benzaldehydes.
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Affiliation(s)
- Gréta Bettina Kovács
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary .,Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics Műegyetem Rakpart 3 Budapest H-1111 Hungary
| | - Nóra V May
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - Petra Alexandra Bombicz
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - Szilvia Klébert
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - Péter Németh
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - Alfréd Menyhárd
- Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics Budapest Hungary
| | - Gyula Novodárszki
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - Vladimir Petrusevski
- Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University Skopje Republic of Macedonia
| | - Fernanda Paiva Franguelli
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - József Magyari
- Department of Chemistry, Biochemistry and Environmental Protection, Faculty of Sciences, University of Novi Sad Trg Dositeja Obradovića 3 Novi Sad 21000 Serbia
| | - Kende Béres
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary
| | - Imre Miklós Szilágyi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics Műegyetem Rakpart 3 Budapest H-1111 Hungary
| | - László Kótai
- Research Centre for Natural Sciences, Hungarian Academy of Sciences Magyar Tudósok krt. 2 Budapest H-1117 Hungary .,Deuton-X Ltd. Selmeci u. 89 Érd H-2030 Hungary
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10
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Pullella GA, Wdowiak AP, Sykes ML, Lucantoni L, Sukhoverkov KV, Zulfiqar B, Sobolev AN, West NP, Mylne JS, Avery VM, Piggott MJ. Total Synthesis of the Antimalarial Ascidian Natural Product Albopunctatone. Org Lett 2019; 21:5519-5523. [DOI: 10.1021/acs.orglett.9b01838] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Melissa L. Sykes
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | - Leonardo Lucantoni
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | | | - Bilal Zulfiqar
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | | | - Nicholas P. West
- Tuberculosis Research Laboratory, School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Australia
| | | | - Vicky M. Avery
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
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11
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Hiroto S. Synthesis of π‐Functional Molecules through Oxidation of Aromatic Amines. Chem Asian J 2019; 14:2514-2523. [DOI: 10.1002/asia.201900213] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/20/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Satoru Hiroto
- Graduate School of Human and Environmental StudiesKyoto University Yoshidanihonmatsu-cho, Sakyo-ku Kyoto 606-8501 Japan
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12
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Haines BE, Nelson BM, Grandner JM, Kim J, Houk KN, Movassaghi M, Musaev DG. Mechanism of Permanganate-Promoted Dihydroxylation of Complex Diketopiperazines: Critical Roles of Counter-cation and Ion-Pairing. J Am Chem Soc 2018; 140:13375-13386. [PMID: 30295476 DOI: 10.1021/jacs.8b08371] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The mechanism of permanganate-mediated dual C-H oxidation of complex diketopiperazines has been examined with density functional theory computations. The products of these oxidations are enabling intermediates in the synthesis of structurally diverse ETP natural products. We evaluated, for the first time, the impact of ion-pairing and aggregation states of the permanganate ion and counter-cations, such as bis(pyridine)-silver(I) (Ag+) and tetra- n-butylammonium (TBA+), on the C-H oxidation mechanism. The C-H abstraction occurs through an open shell singlet species, as noted previously, followed by O-rebound and a competing OH-rebound pathway. The second C-H oxidation proceeds with a second equivalent of oxidant with lower free energy barriers than the first C-H oxidation due to directing effects and the generation of a more reactive oxidant species after the first C-H oxidation. The success and efficiency of the second C-H oxidation are found to be critically dependent on the presence of an ion-paired oxidant. We used the developed mechanistic knowledge to rationalize an experimentally observed oxidation pattern for C3-indole-substituted diketopiperazine (+)-5 under optimal oxidation conditions: namely, the formation of diol (-)-6 as a single diastereomer and lack of the ketone products. We proposed two factors that may impede the ketone formation: (i) the conformational flexibility of the diketopiperazine ring, and (ii) hindrance of this site, making it less accessible to the ion-paired oxidant species.
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Affiliation(s)
- Brandon E Haines
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry , Emory University , Atlanta , Georgia 30322 , United States
| | - Brandon M Nelson
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Jessica M Grandner
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , United States
| | - Justin Kim
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - K N Houk
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , United States
| | - Mohammad Movassaghi
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Djamaladdin G Musaev
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry , Emory University , Atlanta , Georgia 30322 , United States
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13
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Sajó IE, Kovács GB, Pasinszki T, Bombicz PA, May Z, Szilágyi IM, Jánosity A, Banerji KK, Kant R, Kótai L. The chemical identity of “[Ag(py)2]MnO4” organic solvent soluble oxidizing agent and new synthetic routes for the preparation of [Ag(py)n]XO4 (X = Mn, Cl, and Re, n = 2–4) complexes. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1493464] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- István E. Sajó
- János Szentágothai Research Centre, University of Pécs, Pécs, Hungary
| | - Gréta B. Kovács
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, Hungary
| | - Tibor Pasinszki
- Department of Chemistry, Faculty of Sciences, College of Engineering, Science & Technology, Fiji National University, Nasinu, Suva, Fiji Islands
| | - Petra A. Bombicz
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Zoltán May
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Imre M. Szilágyi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Budapest, Hungary
| | - Anna Jánosity
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | | | - Rajni Kant
- Department of Physics, X-ray Crystallography Laboratory, University of Jammu, Jammu-Tawi, India
| | - László Kótai
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
- Deuton-X Ltd., Érd, Hungary
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14
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Bischoff AJ, Nelson BM, Niemeyer ZL, Sigman MS, Movassaghi M. Quantitative Modeling of Bis(pyridine)silver(I) Permanganate Oxidation of Hydantoin Derivatives: Guidelines for Predicting the Site of Oxidation in Complex Substrates. J Am Chem Soc 2017; 139:15539-15547. [PMID: 28975782 PMCID: PMC5739304 DOI: 10.1021/jacs.7b09541] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The bis(pyridine)silver(I) permanganate promoted hydroxylation of diketopiperazines has served as a pivotal transformation in the synthesis of complex epipolythiodiketopiperazine alkaloids. This late-stage C-H oxidation chemistry is strategically critical to access N-acyl iminium ion intermediates necessary for nucleophilic thiolation of advanced diketopiperazines en route to potent epipolythiodiketopiperazine anticancer compounds. In this study, we develop an informative mathematical model using hydantoin derivatives as a training set of substrates by relating the relative rates of oxidation to various calculated molecular descriptors. The model prioritizes Hammett values and percent buried volume as key contributing factors in the hydantoin series while correctly predicting the experimentally observed oxidation sites in various complex diketopiperazine case studies. Thus, a method is presented by which to use simplified training molecules and resulting correlations to explain and predict reaction behavior for more complex substrates.
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Affiliation(s)
- Amanda J. Bischoff
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Brandon M. Nelson
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Zachary L. Niemeyer
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, United States
| | - Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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15
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Abstract
The first total synthesis of (+)-luteoalbusins A and B is described. Highly regio- and diastereoselective chemical transformations in our syntheses include a Friedel-Crafts C3-indole addition to a cyclotryptophan-derived diketopiperazine, a late-stage diketopiperazine dihydroxylation, and a C11-sulfidation sequence, in addition to congener-specific polysulfane synthesis and cyclization to the corresponding epipolythiodiketopiperazine. We also report the cytoxicity of both alkaloids, and closely related derivatives, against A549, HeLa, HCT116, and MCF7 human cancer cell lines.
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Affiliation(s)
- Timothy C. Adams
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Joshua N. Payette
- The Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 500 Main Street, Cambridge, Massachusetts 02139, United States
| | - Jaime H. Cheah
- The Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, 500 Main Street, Cambridge, Massachusetts 02139, United States
| | - Mohammad Movassaghi
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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16
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Kumari S, Shekhar A, Pathak DD. Graphene oxide supported MnO2 nanorods: an efficient heterogeneous catalyst for oxidation of aromatic amines to azo-compounds. RSC Adv 2014. [DOI: 10.1039/c4ra11549j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Graphene oxide supported MnO2 nanorods (GOnc), a composite material, has been synthesized and characterized by XRD, FE-SEM, EDX, BET surface area measurement, FTIR and Raman Spectroscopy.
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Affiliation(s)
- Shweta Kumari
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004, India
| | - Amiya Shekhar
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004, India
| | - Devendra D. Pathak
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004, India
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17
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Zhu Y, Shi Y. Facile Cu(I)-catalyzed oxidative coupling of anilines to azo compounds and hydrazines with diaziridinone under mild conditions. Org Lett 2013; 15:1942-5. [PMID: 23545123 PMCID: PMC3717407 DOI: 10.1021/ol4005917] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A mild and highly efficient Cu(I)-catalyzed oxidative coupling of anilines is described. Various primary and secondary anilines can be efficiently coupled under mild conditions to the corresponding azo compounds and hydrazines in high yields. This method provides a direct and practical access to these compounds and is also amenable to gram scale with no special precautions to exclude air or moisture.
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Affiliation(s)
- Yingguang Zhu
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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18
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Affiliation(s)
- Rumpa Saha
- a Department of Chemistry , The University of Burdwan , Burdwan – 713104 , WB , India
| | - Rumki Nandi
- a Department of Chemistry , The University of Burdwan , Burdwan – 713104 , WB , India
| | - Bidyut Saha
- a Department of Chemistry , The University of Burdwan , Burdwan – 713104 , WB , India
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19
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Iwasa E, Hamashima Y, Sodeoka M. Epipolythiodiketopiperazine Alkaloids: Total Syntheses and Biological Activities. Isr J Chem 2011. [DOI: 10.1002/ijch.201100012] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Merino E. Synthesis of azobenzenes: the coloured pieces of molecular materials. Chem Soc Rev 2011; 40:3835-53. [DOI: 10.1039/c0cs00183j] [Citation(s) in RCA: 483] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Kesenheimer C, Kalogerakis A, Meissner A, Groth U. The cobalt way to angucyclinones: asymmetric total synthesis of the antibiotics (+)-rubiginone B2, (-)-tetrangomycin, and (-)-8-O-methyltetrangomycin. Chemistry 2010; 16:8805-21. [PMID: 20575121 DOI: 10.1002/chem.201000804] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A cobalt(I)-mediated convergent and asymmetric total synthesis of angucyclinones with an aromatic B ring has been developed. In the course of our research, we synthesized three naturally occurring anguclinone derivatives, namely, (+)-rubiginone B(2) (1), (-)-8-O-methyltetrangomycin (2), and (-)-tetrangomycin (3). By combining 3-hydroxybenzoic acid, 3-methoxybenzoic acid, citronellal, and geraniol as starting materials in a convergent way, we were able to synthesize chiral triyne chains, which were cyclized with [CpCo(C(2)H(4))(2)] (Cp=cyclopentadienyl) by means of an intramolecular [2+2+2] cycloaddition to their corresponding tetrahydrobenzo[a]anthracenes. Successive oxidation and deprotection steps led to the above-mentioned natural products 1-3.
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Affiliation(s)
- Christian Kesenheimer
- Fachbereich Chemie and Konstanz Research School Chemical Biology, Universität Konstanz, Universitätsstrasse 10, Postfach 720, 78457 Konstanz, Germany
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van Eijk PJSS, Reinhoudt DN, Harkema S, Visser R. Chemistry of four-membered cyclic nitrones. Reaction with a non-nucleophilic base: Stereoselective ring opening ofin situgenerated 1,2-dihydroazetes and structure elucidation of the resulting α,β-unsaturated oximes by X-ray analysis. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19861050402] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Starosotnikov AM, Leontieva MA, Bastrakov MA, Puchnin AV, Kachala VV, Shevelev SA. Superelectrophilic nature of 4,6-dinitrobenzo[c]isoxazole (4,6-dinitroanthranil) in [4+2]-cycloaddition reactions and σH-complex formation. MENDELEEV COMMUNICATIONS 2010. [DOI: 10.1016/j.mencom.2010.05.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Bastrakov MA, Starosotnikov AM, Glukhov IV, Shevelev SA. Synthesis and oxidative cyclization of 7-amino-3-R-4,6-dinitrobenzo[d]isoxazoles. Russ Chem Bull 2010. [DOI: 10.1007/s11172-010-0027-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
The fungal metabolite (+)-11,11'-dideoxyverticillin A, a cytotoxic alkaloid isolated from a marine Penicillium sp., belongs to a fascinating family of densely functionalized, stereochemically complex, and intricate dimeric epidithiodiketopiperazine natural products. Although the dimeric epidithiodiketopiperazines have been known for nearly 4 decades, none has succumbed to total synthesis. We report a concise enantioselective total synthesis of (+)-11,11'-dideoxyverticillin A via a strategy inspired by our biosynthetic hypothesis for this alkaloid. Highly stereo- and chemoselective advanced-stage tetrahydroxylation and tetrathiolation reactions, as well as a mild strategy for the introduction of the epidithiodiketopiperazine core in the final step, were developed to address this highly sensitive substructure. Our rapid functionalization of the advanced molecular framework aims to mimic plausible biosynthetic steps and offers an effective strategy for the chemical synthesis of other members of this family of alkaloids.
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Affiliation(s)
- Justin Kim
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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27
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Oxidative alkylamination of aromatic and heteroaromatic substrates and accompanying heterocyclization reactions. Russ Chem Bull 2009. [DOI: 10.1007/s11172-008-0127-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Gulevskaya AV, Verbeeck S, Burov ON, Meyers C, Korbukova IN, Herrebout W, Maes BUW. Synthesis of (Alkylamino)nitroarenes by Oxidative Alkylamination of Nitroarenes. European J Org Chem 2009. [DOI: 10.1002/ejoc.200800740] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Xue J, Du Y, Chuang YP, Phillips DL, Wang J, Luk C, Hadad CM, Platz MS. Time-resolved resonance Raman observation of the dimerization of didehydroazepines in solution. J Phys Chem A 2008; 112:1502-10. [PMID: 18225870 DOI: 10.1021/jp077215g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Time-resolved resonance Raman (TR3) studies of the photochemistry of phenyl azide, 3-hyroxyphenyl azide, 3-methoxyphenyl azide and 3-nitrophenyl azide in acetonitrile:water solutions is reported. After photolysis of these four aryl azides in room temperature solutions, only one species was observed in the TR3 spectra for each azide, respectively at the probe wavelengths employed in the TR3 experiments. The species observed after photolysis of 3-nitrophenyl azide was assigned to 3,3'-dinitroazobenzene, an azo compound formed from the dimerization reaction of triplet 3-nitrophenylnitrene. In contrast, the species observed after photolysis of phenyl azide, 3-hydroxyphenyl azide and 3-methoxyphenyl azide were tentatively assigned to intermediates formed from the dimerization of didehydroazepines that are produced from the ring expansion reaction of the respective singlet arylnitrene. To our knowledge, this is the first time-resolved vibrational spectroscopic observation of the dimerization reaction of didehydroazepines in solution. In addition, these are the first resonance Raman spectra reported for dimers formed from didehydroazepines. We briefly discuss the structures, properties and chemical reactivity of the dimer species observed in the TR3 spectra and possible implications for the photochemistry of aryl azides.
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Affiliation(s)
- Jiadan Xue
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R., People's Republic of China
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Badri R, Mostoufi A. The Synthesis and Application of 3,6-Bis(triphenylphosphonium) Cyclohexene Dichromate: An Efficient Oxidizing Agent. PHOSPHORUS SULFUR 2007. [DOI: 10.1080/10426500600634715] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Rashid Badri
- a Chemistry Department , Chamran University , Ahwaz, Iran
| | - Azar Mostoufi
- a Chemistry Department , Chamran University , Ahwaz, Iran
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Firouzabadi H, Iranpoor N. Ceric Triethylammonium Nitrate [Ce(Et3NH)2l(NO3)6; An Efficient Oxidant for the Oxidation of Benzylic Alcohols and α-Hydroxy Ketones to Their Corresponding Carbonyl Compounds Under Mild Conditions. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397918308080900] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Firouzabadi H, Iranpoor N, Parham H, Tootan J. Bis[Trinitratocerium(IV)]Chromate [Ce(N03)312Cr04; A Mild Oxidant in Organic Synthesis. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397918408063748] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Firouzabadi H, Sardarian A, Gharibi H. Tetrakis (Pyridine)silver Dichromate Py4Ag2Cr207- A Mild and Efficient Reagent for the Conversion of Benzylic and Allylic Alcohols to Their Corresponding Carbonyl Compounds. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397918408060869] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Firouzabadi H, Sardarian A. An Efficient Conversion of Oximes to Their Corresponding Carbonyl Compounds with Bispyridinesilver Permanganate Under Mild Conditions. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397918308063722] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Gulevskaya AV, Maes BUW, Meyers C, Herrebout WA, van der Veken BJ. C–N Bond Formation by the Oxidative Alkylamination of Azines: Comparison of AgPy2MnO4 versus KMnO4 as Oxidant. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600573] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Firouzabadi H, Fakoorpour M, Hazarkhani H. HIGHLY SELECTIVE OXIDATION OF PRIMARY AND SECONDARY BENZYLIC ALCOHOLS BY KMnO4/ZrOCI2 8H2O IN DIETHYL ETHER. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-100108237] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Habib Firouzabadi
- a Department of Chemistry , College of Sciences, Shiraz University , Shiraz, 71454, Iran
| | - Mahmood Fakoorpour
- a Department of Chemistry , College of Sciences, Shiraz University , Shiraz, 71454, Iran
| | - Hassan Hazarkhani
- a Department of Chemistry , College of Sciences, Shiraz University , Shiraz, 71454, Iran
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Kótai L, Fodor J, Jakab E, Sajó I, Szabó P, Lónyi F, Valyon J, Gács I, Argay G, Banerji KK. A Thermally Induced Low-temperature Intramolecular Redox Reaction of bis(pyridine)silver(I) Permanganate and its hemipyridine Solvate. TRANSIT METAL CHEM 2006. [DOI: 10.1007/s11243-005-6322-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Rizk MS, Shi X, Platz MS. Lifetimes and Reactivities of Some 1,2-Didehydroazepines Commonly Used in Photoaffinity Labeling Experiments in Aqueous Solutions. Biochemistry 2005; 45:543-51. [PMID: 16401083 DOI: 10.1021/bi0516632] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactive 1,2-didehydroazepine (cyclic ketenimine) intermediates produced upon photolysis of phenyl azide, 3-hydroxyphenyl azide, 3-methoxyphenyl azide, and 3-nitrophenyl azide in water and in HEPES buffer were studied by laser flash photolysis techniques with UV-vis detection of the transient intermediates. The lifetimes of the 1,2-didehydroazepines were obtained along with the absolute rate constants of their reactions with typical amino acids, nucleosides, and other simple reagents present in a biochemical milieu. The nitro substituent greatly accelerates the bimolecular reactions of the cyclic ketenimines, and the 3-methoxy group greatly decelerates the absolute reactivity of 1,2-didehydroazepines. The intermediate produced by photolysis of 3-hydroxyphenyl azide is much more reactive than the intermediate produced by photolysis of 3-methoxyphenyl azide. We propose that the hydroxyl-substituted 1,2-didehydoazepines rapidly (<10 micros) tautomerize in water to form azepinones and much more rapidly than the corresponding 3-methoxy-substituted cyclic ketenimines undergo hydrolysis. Azepinones react more rapidly with nucleophiles than do methoxy-substituted 1,2-didehydroazepines and are the active species present upon the photolysis of 3-hydroxyphenyl azide in aqueous solution.
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Affiliation(s)
- Mary S Rizk
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, USA
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Reasons for and Consequences of the Mysterious Behaviour of Newly Prepared Hemipyridine Solvate of Bis(pyridine)silver(I) Permanganate, Agpy2MnO4*0.5py. TRANSIT METAL CHEM 2005. [DOI: 10.1007/s11243-005-6231-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Selective Oxidation of Benzylic and Allylic Alcohols Using Strontium Manganate in the Presence of Lewis Acids in Solution and under Solvent-Free Conditions. B KOREAN CHEM SOC 2004. [DOI: 10.5012/bkcs.2004.25.4.566] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Role of quaternaryammonium permanganates in the synthesis of substituted guanidines—a comparative study. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)01956-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Orito K, Hatakeyama T, Takeo M, Uchiito S, Tokuda M, Suginome H. Dimerization of anilines and benzylamines with mercury(II) oxide-iodine reagent. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00461-x] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Firouzabadi H, Salehi P, Sardarian AR, Seddighi M. Oxidation of Benzylic Hydrocarbons to Carbonyl Compounds by Tetrapyridinesilver(II) Peroxydisulfate Ag(Py)4S2O8Under Non-Aqueous and Aprotic Condition. SYNTHETIC COMMUN 1991. [DOI: 10.1080/00397919108021030] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Gulevskaya AV, Pozharskii AF, Shorshnev SV, Kuz’menko VV. Different Behaviour of Fervenulin 4-Oxide and 1,3-Dimethyllumazine 5-Oxide towards Nucleophiles. MENDELEEV COMMUNICATIONS 1991. [DOI: 10.1070/mc1991v001n02abeh000026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Cieslak-Golonka M, Bartecki A, Jezierska J. Copper(II) chromate and dichromate complexes with polypyridines. Physicochemical and reactivity studies. Polyhedron 1991. [DOI: 10.1016/s0277-5387(00)86138-0] [Citation(s) in RCA: 13] [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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48
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Gulevskaya AV, Pozharskii AF, Lomachenkova LV. Chichibabin amination of 1,3-dimethyllumazine. Chem Heterocycl Compd (N Y) 1990. [DOI: 10.1007/bf00476996] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Firouzabadi H, Mottaghineiad E, Seddighi M. Barium Permangante a Useful Oxidant for the Selective Deoximation of Benzylic Oximes to their Corresponding Carbonyl Compounds. SYNTHETIC COMMUN 1989. [DOI: 10.1080/00397918908052756] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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