1
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Nallappan S, Lapinskaite R, Hájíček J, Kunák D, Čambal P, Nečas D, Císařová I, Atalay HN, Tumer TB, Tarábek J, Schwarzová-Pecková K, Rycek L. The Biomimetic Synthesis of Polyarylated Fluorenes, Relevant to Selaginellaceae Polyphenols, Leading to the Spontaneous Formation of Stable Radicals. Chempluschem 2024; 89:e202300410. [PMID: 37943550 DOI: 10.1002/cplu.202300410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 10/31/2023] [Accepted: 11/08/2023] [Indexed: 11/10/2023]
Abstract
This work reports a biomimetic synthesis of polyarylated fluorene derivatives. The molecules are formed via intramolecular electrophilic aromatic substitution, resembling a cyclization leading towards the natural selaginpulvilins from selaginellins. The scope of the reaction was investigated, and the products were obtained in 60-95 % yields. Some of the compounds decompose to a stable radical. We investigated the nature and the origin of the radical using experimental methods, including EPR or electrochemical measurements, as well as theoretical methods, such as DFT calculations. Based on our observations, we hypothesize, that phenoxy radicals are formed in the first instance, which however undergo internal rearrangement to thermodynamically more stable carbon-centered radicals. The preliminary data also show the cytotoxic properties of some of the molecules.
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Affiliation(s)
- Sundaravelu Nallappan
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Ringaile Lapinskaite
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
- Department of Organic Chemistry, Center for Physical Sciences and Technology, Akademijos g. 7, Vilnius, 08412, Lithuania
| | - Josef Hájíček
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Dominik Kunák
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Peter Čambal
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - David Nečas
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Hazal Nazlıcan Atalay
- Department of Molecular Biology and Genetics, Faculty of Arts and Science, Canakkale Onsekiz Mart University, Canakkale, 17020, Turkey
| | - Tugba B Tumer
- Department of Molecular Biology and Genetics, Faculty of Arts and Science, Canakkale Onsekiz Mart University, Canakkale, 17020, Turkey
| | - Ján Tarábek
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, Flemingovo nám. 2, 166 10, Prague, Czech Republic
| | - Karolina Schwarzová-Pecková
- Department of Analytical Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
| | - Lukas Rycek
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 00, Prague, Czech Republic
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2
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Ganaie BA, Balasubramani A, Bhat BA, Mehta G. Indeno-Annulation of o-Formyl-Ynones, o-Bis-Ynones, and p-Bis- o-Formyl-Ynones with Dimethyl Acetone-1,3-Dicarboxylate: One Flask Cascade Synthesis of Functionally Endowed 9-Fluorenols and Indeno[1,2- b]fluorenols. J Org Chem 2023; 88:11637-11649. [PMID: 37558646 DOI: 10.1021/acs.joc.3c00958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
A mild, scalable, one-pot access to multifunctional 9-fluorenols from o-formyl-ynones and o-bis-ynones on reaction with dimethylacetone-1,3-dicarboxyate through tandem Michael addition-Aldol condensation cascade has been conceptualized and executed. The scope and utility of this synthetic approach have been further amplified for one-pot entry into functionally enhanced, higher order fluorenols like pentacyclic indeno[1,2-b]fluorene-6,12-diols and further to indeno[1,2-b]fluorene-6,12-diones through the implementation of "double indeno-annulation" tactic on p-bis-o-formyl ynones and dimethylacetone-1,3-dicarboxylate. Besides several green attributes, the current approach is also compatible with the emerging time and energy economy features and is a swift gateway to build complexity.
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Affiliation(s)
| | | | - Bilal A Bhat
- Natural Products & Medicinal Chemistry, CSIR-Indian Institute and Integrative Medicine Sanatnagar, Srinagar 190005, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Goverdhan Mehta
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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3
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Borges RS, Aguiar CPO, Oliveira NLL, Amaral INA, Vale JKL, Chaves Neto AMJ, Queiroz AN, da Silva ABF. Antioxidant capacity of simplified oxygen heterocycles and proposed derivatives by theoretical calculations. J Mol Model 2023; 29:232. [PMID: 37407749 DOI: 10.1007/s00894-023-05602-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 05/22/2023] [Indexed: 07/07/2023]
Abstract
CONTEXT Some structural properties can be involved in the antioxidant capacity of several polyphenol derivatives, among them their simplified structures. This study examines the contribution of simplified structure for the antioxidant capacity of some natural and synthetic antioxidants. The resonance structures were related to the π-type electron system of carbon-carbon double bonds between both phenyl rings. Trans-resveratrol, phenyl-benzofuran, phenyl-indenone, and benzylidene-benzofuranone are the best basic antioxidant templates among the simplified derivatives studied here. Additionally, the stilbene moiety was found on the molecules with the best antioxidant capacity. Furthermore, our investigation suggests that these compounds can be used as antioxidant scaffold for designing and developing of new promising derivatives. METHODS To investigate the structure-antioxidant capacity for sixteen simplified natural and proposed derivatives we have employed density functional theory and used Gaussian 09. Our DFT calculations were performed using the B3LYP functional and the 6-31+G(d,p) basis set. All electron transfer mechanisms were investigated by using values of HOMO, ionization potential, energy affinity, stabilization energies, and spin density distributions.
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Affiliation(s)
- Rosivaldo S Borges
- Núcleo de Estudos e Seleção de Compostos Bioativos, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil.
- Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, São Carlos, SP, 13560-970, Brazil.
| | - Christiane P O Aguiar
- Núcleo de Estudos e Seleção de Compostos Bioativos, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil
| | - Nicole L L Oliveira
- Núcleo de Estudos e Seleção de Compostos Bioativos, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil
| | - Israel N A Amaral
- Núcleo de Estudos e Seleção de Compostos Bioativos, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil
| | - Joyce K L Vale
- Núcleo de Estudos e Seleção de Compostos Bioativos, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil
| | - Antonio M J Chaves Neto
- Faculdade de Física, Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil
| | - Auriekson N Queiroz
- Núcleo de Estudos e Seleção de Compostos Bioativos, Instituto de Ciências da Saúde, Universidade Federal do Pará, Belém, PA, 66075-110, Brazil
| | - Albérico B F da Silva
- Instituto de Química de São Carlos, Universidade de São Paulo, CP 780, São Carlos, SP, 13560-970, Brazil
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4
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Liu C, Yu J, Bao L, Zhang G, Zou X, Zheng B, Li Y, Zhang Y. Electricity-Promoted Friedel-Crafts Acylation of Biarylcarboxylic Acids. J Org Chem 2023; 88:3794-3801. [PMID: 36861957 DOI: 10.1021/acs.joc.2c03071] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
An electricity-promoted method for Friedel-Crafts acylation of biarylcarboxylic acids is described in this research. Various fluorenones can be accessed in up to 99% yields. During the acylation, electricity plays an essential role, which might motivate the chemical equilibrium by consuming the generated TFA. This study is predicted to provide an avenue to realize Friedel-Crafts acylation in a more environmentally friendly process.
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Affiliation(s)
- Chen Liu
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Jiage Yu
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Liang Bao
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Gaoyuan Zhang
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Xinyue Zou
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Bing Zheng
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Yiyi Li
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Yunfei Zhang
- Department of Chemistry, China Agricultural University, Beijing 100193, P. R. China
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5
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Guo JD, Chen YJ, Wang CH, He Q, Yang XL, Ding TY, Zhang K, Ci RN, Chen B, Tung CH, Wu LZ. Direct Excitation of Aldehyde to Activate the C(sp 2 )-H Bond by Cobaloxime Catalysis toward Fluorenones Synthesis with Hydrogen Evolution. Angew Chem Int Ed Engl 2023; 62:e202214944. [PMID: 36510781 DOI: 10.1002/anie.202214944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 12/10/2022] [Accepted: 12/12/2022] [Indexed: 12/15/2022]
Abstract
A new way to form fluorenones via the direct excitation of substrates instead of photocatalyst to activate the C(sp2 )-H bond under redox-neutral condition is reported. Our design relies on the photoexcited aromatic aldehyde intermediates that can be intercepted by cobaloxime catalyst through single electron transfer for following β-H elimination. The generation of acyl radical and successful interception by a metal catalyst cobaloxime avoid the use of a photocatalyst and stoichiometric external oxidants, affording a series of highly substituted fluorenones, including six-membered ketones, such as xanthone and thioxanthone derivatives in good to excellent yields, and with hydrogen as the only byproduct. This catalytic system features a readily available metal catalyst, mild reaction conditions and broad substrate scope, in which sunlight reaction and scale-up experiments by continuous-flow approach make the new methodology sustainable and amenable for potentially operational procedures.
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Affiliation(s)
- Jia-Dong Guo
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Ya-Jing Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Chen-Hong Wang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Qiao He
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Xiu-Long Yang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Tian-Yu Ding
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Ke Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Rui-Nan Ci
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Bin Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Chen-Ho Tung
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Li-Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, The Chinese Academy of Sciences, Beijing, 100190, P. R. China.,School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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6
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Balasubramani A, Mehta G. One-Pot Synthesis of Functionally Enriched Benzo[ b]fluorenones: An Eco-Friendly Embedment of Diverse 1-Indanones into o-Bis-Ynones. J Org Chem 2023; 88:933-943. [PMID: 36602529 DOI: 10.1021/acs.joc.2c02330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
An efficient, base-promoted, one-pot, metal-free, open-flask synthesis of diverse, functionally enriched benzo[b]fluoren-11-ones has been discovered, and wide applicability of this exceptionally simple protocol with green flavors has been scoped. This synthesis proceeds via an unanticipated, tandem, double-aldol condensation between in situ-generated 1-indanone dianions and o-bis-ynones to furnish benzo[b]fluoren-11-ones harboring as many as six variegated substituents on their tetracyclic framework. This methodology has also been amplified to access heterocyclic analogues 2- and 4-azabenzo[b]fluorenones of benzo[b]fluoren-11-ones and extended to mixed linear-angular annulated pentacyclic dibenzo[a,h]fluoren-13-one.
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Affiliation(s)
| | - Goverdhan Mehta
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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7
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Bacaicoa S, Goossens E, Sundén H. Aerobic Oxidative N-Heterocyclic Carbene-Catalyzed Formal [3+3] Cyclization for the Synthesis of Tetrasubstituted Benzene Derivatives. Org Lett 2022; 24:9146-9150. [DOI: 10.1021/acs.orglett.2c03879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Sara Bacaicoa
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 412 96 Göteborg, Sweden
| | - Ellymay Goossens
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 412 96 Göteborg, Sweden
| | - Henrik Sundén
- Department of Chemistry and Molecular Biology, University of Gothenburg, Kemivägen 10, 412 96 Göteborg, Sweden
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8
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Balasubramani A, Gunnam A, Mehta G. In Situ-Generated Ammonia Mediates Deep Restructuring of o-Bis-Ynones through a Cascade Process: One-Pot Synthesis of 2-Azafluorenones. J Org Chem 2022; 87:10138-10145. [PMID: 35818118 DOI: 10.1021/acs.joc.2c01089] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
One-pot synthesis of 2-azaflorenones from readily accessed o-bis-ynones through Michael addition, orthogonal aldol reaction, dehydrative isomerization, and a 6-endo-dig-cyclization cascade, triggered by in situ-generated ammonia in the presence of a Cu(I) catalyst, has been discovered and its generality scoped. A few selected reactions of a prototypical 2-azafluorenone have been explored for functionality augmentation in its core structure. Overall, this operationally convenient 2-azafluorenone synthesis involves the formation of five new bonds (3 C-N and 2 C-C) in one pot and embodies many green and sustainable features; notably, the reagent ammonia is subsumed into the reactant o-bis-ynones with atom economy, and the only by-product is water.
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Affiliation(s)
| | - Anilkumar Gunnam
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Goverdhan Mehta
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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9
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Toson V, Antonioli D, Boccaleri E, Milanesio M, Gianotti V, Conterosito E. Analytical Characterization of the Intercalation of Neutral Molecules into Saponite. Molecules 2022; 27:molecules27103048. [PMID: 35630525 PMCID: PMC9143227 DOI: 10.3390/molecules27103048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 05/01/2022] [Accepted: 05/05/2022] [Indexed: 12/10/2022] Open
Abstract
Organo-modified layered materials characterization poses challenges due to their complexity and how other aspects such as contamination, preparation methods and degree of intercalation influence the properties of these materials. Consequently, a deep understanding of their interlayer organization is of utmost importance to optimize their applications. These materials can in fact improve the stability of photoactive molecules through intercalation, avoiding the quenching of their emission at the solid state, to facilitate their use in sensors or other devices. Two synthetic methods for the preparation of saponites with a cationic surfactant (CTABr) and a neutral chromophore (Fluorene) were tested and the obtained products were initially characterized with several complementary techniques (XRPD, SEM, TGA, IR, UV-Vis, Fluorescence and Raman spectroscopy), but a clear understanding of the organization of the guest molecules in the material could not be obtained by these techniques alone. This information was obtained only by thermogravimetry coupled with gas chromatography and mass spectroscopy (TGA-GC-MS) which allowed identifying the species present in the sample and the kind of interaction with the host by distinguishing between intercalated and adsorbed on the surface.
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Affiliation(s)
- Valentina Toson
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, 15121 Alessandria, Italy; (V.T.); (D.A.); (M.M.)
| | - Diego Antonioli
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, 15121 Alessandria, Italy; (V.T.); (D.A.); (M.M.)
| | - Enrico Boccaleri
- Dipartimento per lo Sviluppo Sostenibile e la Transizione Ecologica, Università del Piemonte Orientale, 13100 Vercelli, Italy; (E.B.); (V.G.)
| | - Marco Milanesio
- Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, 15121 Alessandria, Italy; (V.T.); (D.A.); (M.M.)
| | - Valentina Gianotti
- Dipartimento per lo Sviluppo Sostenibile e la Transizione Ecologica, Università del Piemonte Orientale, 13100 Vercelli, Italy; (E.B.); (V.G.)
| | - Eleonora Conterosito
- Dipartimento per lo Sviluppo Sostenibile e la Transizione Ecologica, Università del Piemonte Orientale, 13100 Vercelli, Italy; (E.B.); (V.G.)
- Correspondence:
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10
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Laha JK, Gulati U, Saima, Schulte T, Breugst M. pH-Controlled Intramolecular Decarboxylative Cyclization of Biarylacetic Acids: Implication on Umpolung Reactivity of Aroyl Radicals. J Org Chem 2022; 87:6638-6656. [PMID: 35484866 DOI: 10.1021/acs.joc.2c00295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple approach for the intramolecular aroylation of electron-rich arenes under mild conditions has been developed. A pH-controlled polarity umpolung strategy can be used to synthesize different fluorenones, which are important building blocks for biological applications. Unlike previous acylation reactions involving nucleophilic aroyl radicals, this approach likely relies on in situ generated electrophilic aroyl radicals. Detailed mechanistic and computational investigations provide detailed insights into the reaction mechanism and support the hypothesis of a pH-mediated umpolung.
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Affiliation(s)
- Joydev K Laha
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Upma Gulati
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Saima
- Department of Pharmaceutical Technology (Process Chemistry), National Institute of Pharmaceutical Education and Research, S. A. S. Nagar, Punjab 160062, India
| | - Tim Schulte
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany
| | - Martin Breugst
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany.,Institut für Chemie, Technische Universität Chemnitz, Straße der Nationen 62, 09111 Chemnitz, Germany
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11
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Pankhade YA, Pandey R, Fatma S, Ahmad F, Anand RV. TfOH-Catalyzed Intramolecular Annulation of 2-(Aryl)-Phenyl-Substituted p-Quinone Methides under Continuous Flow: Total Syntheses of Selaginpulvilin I and Isoselagintamarlin A. J Org Chem 2022; 87:3363-3377. [PMID: 35107013 DOI: 10.1021/acs.joc.1c02980] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this article, we describe a convenient method to access 9-aryl fluorene derivatives through a TfOH-catalyzed intramolecular 1,6-conjugate arylation of 2-(aryl)-phenyl-substituted p-quinone methides (QMs) under continuous flow using the microreaction technique. This method was found to be very effective for most of the p-QMs, and the corresponding 9-aryl fluorene derivatives were obtained in moderate to excellent yields. Moreover, this protocol was further elaborated to the first total syntheses of selaginpulvilin I and isoselagintamarlin A.
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Affiliation(s)
- Yogesh A Pankhade
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli, Punjab 140306, India
| | - Rajat Pandey
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli, Punjab 140306, India
| | - Shaheen Fatma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli, Punjab 140306, India
| | - Feroz Ahmad
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli, Punjab 140306, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli, Punjab 140306, India
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12
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Large B, Prim D. On the Shape and Synthesis of Extended Fluorenones: Recent Advances and Upcoming Challenges. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Benjamin Large
- University of York Department of Chemistry YO10 5DD York United Kingdom
| | - Damien Prim
- ILV Université Paris-Saclay, UVSQ, CNRS 78035 Versailles France
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13
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Sakurai Y, Ikai K, Hayakawa K, Ogiwara Y, Sakai N. Palladium-Catalyzed Intramolecular Aromatic C–H Acylation of 2-Arylbenzoyl Fluorides. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210148] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuka Sakurai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Kana Ikai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Kazuki Hayakawa
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Yohei Ogiwara
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Norio Sakai
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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14
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Rycek L, Mateus M, Beytlerová N, Kotora M. Catalytic Cyclotrimerization Pathway for Synthesis of Selaginpulvilins C and D: Scope and Limitations. Org Lett 2021; 23:4511-4515. [PMID: 33724044 DOI: 10.1021/acs.orglett.1c00519] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A facile and unified approach to the main selaginpulvilin's framework was achieved by catalytic [2 + 2 + 2]-cyclotrimerization of a triyne with monosubtituted alkynes. The reaction proceeded with high "ortho" selectivity by using Wilkinson's catalyst (RhCl(PPh3)3) under ambient conditions with reasonable yields. The scope of the reaction with respect to the alkyne as well as the catalytic system was evaluated. The formal total modular syntheses of selaginpulvilin C and D were accomplished by transformation of the cyclotrimerization's products.
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Affiliation(s)
- Lukas Rycek
- Department of Organic Chemistry, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
| | - Miguel Mateus
- Department of Organic Chemistry, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
| | - Nela Beytlerová
- Department of Organic Chemistry, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
| | - Martin Kotora
- Department of Organic Chemistry, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czech Republic
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Oestreich M, Gross BM. The Trityl Cation Embedded into a [7]Helicene-Like Backbone: Preparation and Application as a Lewis Acid Catalyst. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1404-4966] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractThe synthesis of a helically chiral carbenium ion is reported. The new motif is essentially a trityl cation embedded into a [7]helicene-like framework. The key step in its preparation establishes the π-extended fluorenone system in one step by an unprecedented palladium-catalyzed carbonylative annulation of a 4,4′-biphenanthryl-3,3′-diyl precursor. The racemic form of the new carbon Lewis acid was found to catalyze a representative set of reactions typically promoted by the trityl cation.
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