1
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Saikia RA, Talukdar K, Pathak D, Sarma B, Thakur AJ. Utilization of Aryl(TMP)iodonium Salts for Copper-Catalyzed N-Arylation of Isatoic Anhydrides: An Avenue to Fenamic Acid Derivatives and N,N'-Diarylindazol-3-ones. J Org Chem 2023; 88:3567-3581. [PMID: 36827541 DOI: 10.1021/acs.joc.2c02762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Herein, we report a general method for copper-catalyzed N-arylation of isatoic anhydrides with unsymmetrical iodonium salts at room temperature. The developed catalytic protocol is mild and operationally simple, and aryl(TMP)iodonium trifluoroacetate is employed as the arylating partner. The methodology offers the broad applicability of both structurally and electronically diverse aryl groups from aryl(TMP)iodonium salts to access N-arylated isatoic anhydrides in moderate to excellent yields (53-92%). Moreover, the substituted isatoic anhydrides are equally compatible with the protocol too. To demonstrate the synthetic utilities of the N-arylation process, we also report an alternative approach for biologically relevant fenamic acid derivatives and N,N'-diarylindazol-3-ones in a one-pot step economical system. In addition, the scale-up synthesis of flufenamic acid is also illustrated.
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Affiliation(s)
- Raktim Abha Saikia
- Department of Chemical Sciences, Tezpur University, Napaam 784028, India
| | - Khanindra Talukdar
- Department of Chemical Sciences, Tezpur University, Napaam 784028, India
| | - Debabrat Pathak
- Department of Chemical Sciences, Tezpur University, Napaam 784028, India
| | - Bipul Sarma
- Department of Chemical Sciences, Tezpur University, Napaam 784028, India
| | - Ashim Jyoti Thakur
- Department of Chemical Sciences, Tezpur University, Napaam 784028, India
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2
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Stefanou V, Matiadis D, Tsironis D, Igglessi-Markopoulou O, Mckee V, Markopoulos J. Synthesis and structural studies of quinolone-based Zn(II), Mn(II) and Ca(II) complexes involving supramolecular interactions. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2139611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Valentina Stefanou
- School of Chemical Engineering, Laboratory of Organic Chemistry, National Technical University of Athens, Athens, Greece
| | - Dimitris Matiadis
- School of Chemical Engineering, Laboratory of Organic Chemistry, National Technical University of Athens, Athens, Greece
| | - Dimitrios Tsironis
- School of Chemical Engineering, Laboratory of Organic Chemistry, National Technical University of Athens, Athens, Greece
| | - Olga Igglessi-Markopoulou
- School of Chemical Engineering, Laboratory of Organic Chemistry, National Technical University of Athens, Athens, Greece
| | - Vickie Mckee
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Odense, Denmark
- School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
| | - John Markopoulos
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Athens, Athens, Greece
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3
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Wu XX, He Y, Zhao XJ, Li G. Copper‐Catalyzed Electrophilic Arylation of Isatoic Anhydride with Diaryliodonium Salts for Synthesis of N‐Phenylated Isatoic Anhydrides. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200155] [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)
- Xi-Xi Wu
- Yunnan Minzu University School of Ethnic Medicine CHINA
| | - Yonghui He
- Yunnan Minzu University School of Ethnic Medicine CHINA
| | - Xiao-Jing Zhao
- Yunnan Minzu University School of Ethnic Medicine 2929 Yuehua Street 650500 Kunming CHINA
| | - Ganpeng Li
- Yunnan Minzu University School of Ethnic Medicine CHINA
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4
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Secondary Structure of Influenza A Virus Genomic Segment 8 RNA Folded in a Cellular Environment. Int J Mol Sci 2022; 23:ijms23052452. [PMID: 35269600 PMCID: PMC8910647 DOI: 10.3390/ijms23052452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/05/2022] [Accepted: 02/17/2022] [Indexed: 11/17/2022] Open
Abstract
Influenza A virus (IAV) is a member of the single-stranded RNA (ssRNA) family of viruses. The most recent global pandemic caused by the SARS-CoV-2 virus has shown the major threat that RNA viruses can pose to humanity. In comparison, influenza has an even higher pandemic potential as a result of its high rate of mutations within its relatively short (<13 kbp) genome, as well as its capability to undergo genetic reassortment. In light of this threat, and the fact that RNA structure is connected to a broad range of known biological functions, deeper investigation of viral RNA (vRNA) structures is of high interest. Here, for the first time, we propose a secondary structure for segment 8 vRNA (vRNA8) of A/California/04/2009 (H1N1) formed in the presence of cellular and viral components. This structure shows similarities with prior in vitro experiments. Additionally, we determined the location of several well-defined, conserved structural motifs of vRNA8 within IAV strains with possible functionality. These RNA motifs appear to fold independently of regional nucleoprotein (NP)-binding affinity, but a low or uneven distribution of NP in each motif region is noted. This research also highlights several accessible sites for oligonucleotide tools and small molecules in vRNA8 in a cellular environment that might be a target for influenza A virus inhibition on the RNA level.
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5
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Verma E, Patil S, Gajbhiye A. Convenient Novel Method to Access N-Benzylated Isatoic Anhydride: Reaction Behavior of Isatoic Anhydride with 4-Chlorobenzyl Chloride in the Presence of Bases. ACS OMEGA 2021; 6:8346-8355. [PMID: 33817495 PMCID: PMC8015103 DOI: 10.1021/acsomega.1c00061] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
Sodium hydride, potassium carbonate, and other bases are commonly used for N-alkylation of heterocyclic compounds. This report reveals the problems associated with N-benzylation of isatoic anhydride and identifies the plausible byproduct structures formed during the reaction. Subsequently, a novel breakthrough methodology has been developed using diisopropylamine and tetra butyl ammonium bromide. It gives excellent yields >88% in a short reaction time (2 h) at 30 °C with no byproducts, saving on processes as the pure product is directly obtained.
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Affiliation(s)
- Ekta Verma
- Department
of Pharmaceutical Sciences, Dr. Harisingh
Gour University, Sagar, Madhya Pradesh 470003, India
| | - Shailendra Patil
- Swami
Vivekanand University, Sagar, Madhya Pradesh 470228, India
| | - Asmita Gajbhiye
- Department
of Pharmaceutical Sciences, Dr. Harisingh
Gour University, Sagar, Madhya Pradesh 470003, India
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6
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Yuan WC, Zuo J, Yuan SP, Zhao JQ, Wang ZH, You Y. Ring expansion and ring opening of 3-halooxindoles with N-alkoxycarbonyl- O-tosylhydroxylamines for divergent access to 4-aminoquinolin-2-ones and N-Cbz- N’-arylureas. Org Chem Front 2021. [DOI: 10.1039/d0qo01335h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The reaction of N-alkoxycarbonyl-O-tosylhydroxylamines with indol-2-ones in situ generated from 3-halooxindoles has been developed for divergently accessing 4-aminoquinolin-2-ones and N-Cbz-N’-arylureas in good to excellent yields.
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Affiliation(s)
- Wei-Cheng Yuan
- Institute for Advanced Study
- Chengdu University
- Chengdu 610106
- China
| | - Jian Zuo
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Shu-Pei Yuan
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu
- China
| | - Jian-Qiang Zhao
- Institute for Advanced Study
- Chengdu University
- Chengdu 610106
- China
| | - Zhen-Hua Wang
- Institute for Advanced Study
- Chengdu University
- Chengdu 610106
- China
| | - Yong You
- Institute for Advanced Study
- Chengdu University
- Chengdu 610106
- China
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7
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Khamkhenshorngphanuch T, Kulkraisri K, Janjamratsaeng A, Plabutong N, Thammahong A, Manadee K, Na Pombejra S, Khotavivattana T. Synthesis and Antimicrobial Activity of Novel 4-Hydroxy-2-quinolone Analogs. Molecules 2020; 25:molecules25133059. [PMID: 32635479 PMCID: PMC7412474 DOI: 10.3390/molecules25133059] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 06/30/2020] [Accepted: 07/03/2020] [Indexed: 11/16/2022] Open
Abstract
Alkyl quinolone has been proven to be a privileged scaffold in the antimicrobial drug discovery pipeline. In this study, a series of new 4-hydroxy-2-quinolinone analogs containing a long alkyl side chain at C-3 and a broad range of substituents on the C-6 and C-7 positions were synthesized. The antibacterial and antifungal activities of these analogs against Staphylococcus aureus, Escherichia coli, and Aspergillus flavus were investigated. The structure-activity relationship study revealed that the length of the alkyl chain, as well as the type of substituent, has a dramatic impact on the antimicrobial activities. Particularly, the brominated analogs 3j with a nonyl side chain exhibited exceptional antifungal activities against A. flavus (half maximal inhibitory concentration (IC50) = 1.05 µg/mL), which surpassed that of the amphotericin B used as a positive control. The antibacterial activity against S. aureus, although not as potent, showed a similar trend to the antifungal activity. The data suggest that the 4-hydroxy-2-quinolone is a promising framework for the further development of new antimicrobial agents, especially for antifungal treatment.
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Affiliation(s)
- Thitiphong Khamkhenshorngphanuch
- Department of General Education, Faculty of Science and Health Technology, Navamindradhiraj University, Bangkok 10300, Thailand;
| | - Kittipat Kulkraisri
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; (K.K.); (A.J.)
| | - Alongkorn Janjamratsaeng
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; (K.K.); (A.J.)
| | - Napasawan Plabutong
- Antimicrobial Resistance and Stewardship Research Unit, Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand; (N.P.); (A.T.)
| | - Arsa Thammahong
- Antimicrobial Resistance and Stewardship Research Unit, Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand; (N.P.); (A.T.)
| | - Kanitta Manadee
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; (K.M.); (S.N.P.)
| | - Sarisa Na Pombejra
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; (K.M.); (S.N.P.)
| | - Tanatorn Khotavivattana
- Center of Excellence in Natural Products Chemistry, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Correspondence: ; Tel.: +66-2-218-7621
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8
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Wang S, Li X, Zang J, Liu M, Zhang S, Jiang G, Ji F. Palladium-Catalyzed Multistep Tandem Carbonylation/N-Dealkylation/Carbonylation Reaction: Access to Isatoic Anhydrides. J Org Chem 2020; 85:2672-2679. [PMID: 31887040 DOI: 10.1021/acs.joc.9b02771] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A novel and efficient synthesis of isatoic anhydride derivatives was developed via palladium-catalyzed multistep tandem carbonylation/N-dealkylation/carbonylation reaction with alkyl as the leaving group and tertiary anilines as nitrogen nucleophiles. This approach features good functional group compatibility and readily available starting materials. Furthermore, it provided a convenient approach for the synthesis of biologically and medicinally useful evodiamine.
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Affiliation(s)
- Shoucai Wang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
| | - Xuan Li
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
| | - Jiawang Zang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
| | - Meichen Liu
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
| | - Siyu Zhang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
| | - Guangbin Jiang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
| | - Fanghua Ji
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering , Guilin University of Technology , 12 Jiangan Road , Guilin 541004 , China
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9
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Preparation of an N-sec-alkyl 2,6-disubstituted aniline: a key intermediate in the divergent synthesis of S-Metolachlor metabolites. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.10.077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Investigation into the stability and reactivity of the pentacyclic alkaloid dehydroevodiamine and the benz-analog thereof. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.03.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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11
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Tomassoli I, Herlem G, Picaud F, Benchekroun M, Bautista-Aguilera OM, Luzet V, Jimeno ML, Gharbi T, Refouvelet B, Ismaili L. Synthesis, regioselectivity, and DFT analysis of new antioxidant pyrazolo[4,3-c]quinoline-3,4-diones. MONATSHEFTE FUR CHEMIE 2016. [DOI: 10.1007/s00706-016-1660-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Pudlo M, Luzet V, Ismaïli L, Tomassoli I, Iutzeler A, Refouvelet B. Quinolone–benzylpiperidine derivatives as novel acetylcholinesterase inhibitor and antioxidant hybrids for Alzheimer Disease. Bioorg Med Chem 2014; 22:2496-507. [DOI: 10.1016/j.bmc.2014.02.046] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 02/20/2014] [Accepted: 02/24/2014] [Indexed: 10/25/2022]
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13
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Darras FH, Pockes S, Huang G, Wehle S, Strasser A, Wittmann HJ, Nimczick M, Sotriffer CA, Decker M. Synthesis, biological evaluation, and computational studies of Tri- and tetracyclic nitrogen-bridgehead compounds as potent dual-acting AChE inhibitors and hH3 receptor antagonists. ACS Chem Neurosci 2014; 5:225-42. [PMID: 24422467 DOI: 10.1021/cn4002126] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Combination of AChE inhibiting and histamine H3 receptor antagonizing properties in a single molecule might show synergistic effects to improve cognitive deficits in Alzheimer's disease, since both pharmacological actions are able to enhance cholinergic neurotransmission in the cortex. However, whereas AChE inhibitors prevent hydrolysis of acetylcholine also peripherally, histamine H3 antagonists will raise acetylcholine levels mostly in the brain due to predominant occurrence of the receptor in the central nervous system. In this work, we designed and synthesized two novel classes of tri- and tetracyclic nitrogen-bridgehead compounds acting as dual AChE inhibitors and histamine H3 antagonists by combining the nitrogen-bridgehead moiety of novel AChE inhibitors with a second N-basic fragment based on the piperidinylpropoxy pharmacophore with different spacer lengths. Intensive structure-activity relationships (SARs) with regard to both biological targets led to compound 41 which showed balanced affinities as hAChE inhibitor with IC50 = 33.9 nM, and hH3R antagonism with Ki = 76.2 nM with greater than 200-fold selectivity over the other histamine receptor subtypes. Molecular docking studies were performed to explain the potent AChE inhibition of the target compounds and molecular dynamics studies to explain high affinity at the hH3R.
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Affiliation(s)
| | | | - Guozheng Huang
- Pharmazeutische und Medizinische Chemie, Institut für
Pharmazie und Lebensmittelchemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Sarah Wehle
- Pharmazeutische und Medizinische Chemie, Institut für
Pharmazie und Lebensmittelchemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | | | | | - Martin Nimczick
- Pharmazeutische und Medizinische Chemie, Institut für
Pharmazie und Lebensmittelchemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Christoph A. Sotriffer
- Pharmazeutische und Medizinische Chemie, Institut für
Pharmazie und Lebensmittelchemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Michael Decker
- Pharmazeutische und Medizinische Chemie, Institut für
Pharmazie und Lebensmittelchemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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14
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Turner R, Shefer K, Ares M. Safer one-pot synthesis of the 'SHAPE' reagent 1-methyl-7-nitroisatoic anhydride (1m7). RNA (NEW YORK, N.Y.) 2013; 19:1857-63. [PMID: 24141619 PMCID: PMC3884660 DOI: 10.1261/rna.042374.113] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Estimating the reactivity of 2'-hydroxyl groups along an RNA chain of interest aids in the modeling of the folded RNA structure; flexible loops tend to be reactive, whereas duplex regions are generally not. Among the most useful reagents for probing 2'-hydroxyl reactivity is 1-methyl-7-nitroisatoic anhydride (1m7), but the absence of a reliable, inexpensive source has prevented widespread adoption. An existing protocol for the conversion of an inexpensive precursor 4-nitroisatoic anhydride (4NIA) recommends the use of NaH in dimethylformamide (DMF), a reagent combination that most molecular biology labs are not equipped to handle, and that does not scale safely in any case. Here we describe a safer, one-pot method for bulk conversion of 4NIA to 1m7 that reduces costs and bypasses the use of NaH. We show that 1m7 produced by this method is free of side products and can be used to probe RNA structure in vitro.
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Affiliation(s)
- Rushia Turner
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, California 95064, USA
| | - Kinneret Shefer
- Department of Molecular, Cell, and Developmental Biology, University of California, Santa Cruz, Santa Cruz, California 95064, USA
| | - Manuel Ares
- Department of Molecular, Cell, and Developmental Biology, University of California, Santa Cruz, Santa Cruz, California 95064, USA
- Corresponding authorE-mail
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15
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Prousis KC, Tzani A, Avlonitis N, Calogeropoulou T, Detsi A. Reactivity of 2-Methyl-4H-3,1-benzoxazin-4-ones and 2-Methyl-4H-pyrido[2,3-d][1,3]oxazin-4-one under Microwave Irradiation Conditions. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.1869] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kyriakos C. Prousis
- Laboratory of Organic Chemistry, Department of Chemical Sciences, School of Chemical Engineering; National Technical University of Athens; Heroon Polytechniou 9, Zografou Campus GR 15780 Athens Greece
- Institute of Biology, Medicinal Chemistry and Biotechnology; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue 116 35 Athens Greece
| | - Andromachi Tzani
- Laboratory of Organic Chemistry, Department of Chemical Sciences, School of Chemical Engineering; National Technical University of Athens; Heroon Polytechniou 9, Zografou Campus GR 15780 Athens Greece
| | - Nicolaos Avlonitis
- Institute of Biology, Medicinal Chemistry and Biotechnology; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue 116 35 Athens Greece
- Centre for Inflammation Research, The Queen's Medical Research Institute; MRC/University of Edinburgh; 47 Little France Crescent EH16 4TJ Edinburgh UK
| | - Theodora Calogeropoulou
- Institute of Biology, Medicinal Chemistry and Biotechnology; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue 116 35 Athens Greece
| | - Anastasia Detsi
- Laboratory of Organic Chemistry, Department of Chemical Sciences, School of Chemical Engineering; National Technical University of Athens; Heroon Polytechniou 9, Zografou Campus GR 15780 Athens Greece
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16
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Guan ZH, Chen M, Ren ZH. Palladium-Catalyzed Regioselective Carbonylation of C–H Bonds of N-Alkyl Anilines for Synthesis of Isatoic Anhydrides. J Am Chem Soc 2012; 134:17490-3. [DOI: 10.1021/ja308976x] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Zheng-Hui Guan
- Key Laboratory of Synthetic and Natural Functional
Molecule Chemistry of Ministry of Education, Department of Chemistry
& Materials Science, Northwest University, Xi’an 710069, P. R. China
| | - Ming Chen
- Key Laboratory of Synthetic and Natural Functional
Molecule Chemistry of Ministry of Education, Department of Chemistry
& Materials Science, Northwest University, Xi’an 710069, P. R. China
| | - Zhi-Hui Ren
- Key Laboratory of Synthetic and Natural Functional
Molecule Chemistry of Ministry of Education, Department of Chemistry
& Materials Science, Northwest University, Xi’an 710069, P. R. China
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17
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Pin F, Comesse S, Daïch A. Intramolecular N-aza-amidoalkylation in association with Witkop–Winterfeldt oxidation as the key step to synthesize Luotonin-A analogues. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.120] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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18
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Nishiwaki N. Chemistry of nitroquinolones and synthetic application to unnatural 1-methyl-2-quinolone derivatives. Molecules 2010; 15:5174-95. [PMID: 20714294 PMCID: PMC6257690 DOI: 10.3390/molecules15085174] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Revised: 07/28/2010] [Accepted: 07/30/2010] [Indexed: 11/30/2022] Open
Abstract
The 1-methyl-2-quinolone (MeQone) framework is often found in alkaloids and recently attention was drawn to unnatural MeQone derivatives with the aim of finding new biologically active compounds, however, low reactivity of the MeQone framework prevents the syntheses of versatile derivatives. A nitro group is one of the useful activating groups for this framework that enables a concise chemical transformation. Among nitroquinolones, 1-methyl-3,6,8-trinitro-2-quinolone (TNQ) exhibits unusual reactivity favoring region-selective cine-substitutions that afford 4-substituted 1-methyl-6,8-dinitro-2-quinolones upon treatment with nucleophilic reagents. Contrary to this, 1-methyl-3,6-dinitro-2-quinolone (3,6-DNQ) does not undergo any reaction under the same conditions. The unusual reactivity of TNQ is caused by steric repulsion between the methyl group at the 1-position and the nitro group at the 8-position, which distorts the MeQone framework. As a result, the pyridone ring of TNQ loses aromaticity and acts rather as an activated nitroalkene. Indeed, the pyridone moiety of TNQ undergoes cycloaddition with electron-rich alkenes or dienes under mild conditions, whereby a new fused ring is constructed on the [c]-face of the MeQone. Consequently, TNQ can be used as a new scaffold leading to versatile unnatural MeQone derivatives.
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Affiliation(s)
- Nagatoshi Nishiwaki
- School of Environmental Science and Engineering, Kochi University of Technology, Kami, Kochi, Japan.
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