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New Histamine-Related Five-Membered N-Heterocycle Derivatives as Carbonic Anhydrase I Activators. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020545. [PMID: 35056859 PMCID: PMC8779960 DOI: 10.3390/molecules27020545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/08/2022] [Accepted: 01/12/2022] [Indexed: 11/25/2022]
Abstract
A series of histamine (HST)-related compounds were synthesized and tested for their activating properties on five physiologically relevant human Carbonic Anhydrase (hCA) isoforms (I, II, Va, VII and XIII). The imidazole ring of HST was replaced with different 5-membered heterocycles and the length of the aliphatic chain was varied. For the most interesting compounds some modifications on the terminal amino group were also performed. The most sensitive isoform to activation was hCA I (KA values in the low micromolar range), but surprisingly none of the new compounds displayed activity on hCA II. Some derivatives (1, 3a and 22) displayed an interesting selectivity for activating hCA I over hCA II, Va, VII and XIII.
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2
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Fernandes FS, Santos H, Lima SR, Conti C, Rodrigues MT, Zeoly LA, Ferreira LLG, Krogh R, Andricopulo AD, Coelho F. Discovery of highly potent and selective antiparasitic new oxadiazole and hydroxy-oxindole small molecule hybrids. Eur J Med Chem 2020; 201:112418. [PMID: 32590115 DOI: 10.1016/j.ejmech.2020.112418] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/01/2020] [Accepted: 05/02/2020] [Indexed: 11/26/2022]
Abstract
A series of highly active hybrids were discovered as novel antiparasitic agents. Two heterocyclic scaffolds (1,2,4-oxadiazole and 3-hydroxy-2-oxindole) were linked, and the resulting compounds showed in vitro activities against intracellular amastigotes of two protozoan parasites, Trypanosoma cruzi and Leishmania infantum. Their cytotoxicity was assessed using HFF-1 fibroblasts and HepG2 hepatocytes. Compounds 5b, 5d, 8h and 8o showed selectivity against L. infantum (IC50 values of 3.89, 2.38, 2.50 and 2.85 μM, respectively). Compounds 4c, 4q, 8a and 8k were the most potent against T. cruzi, exhibiting IC50 values of 6.20, 2.20, 2.30 and 2.20 μM, respectively. Additionally, the most potent anti-T. cruzi compounds showed in vitro efficacies comparable or superior to that of benznidazole. These easy-to-synthesize molecules represent novel chemotypes for the design of potent and selective lead compounds for Chagas disease and leishmaniasis drug discovery.
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Affiliation(s)
- Fábio S Fernandes
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Hugo Santos
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Samia R Lima
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Caroline Conti
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Manoel T Rodrigues
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Lucas A Zeoly
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil
| | - Leonardo L G Ferreira
- Laboratory of Medicinal and Computational Chemistry, Institute of Physics of Sao Carlos, University of Sao Paulo, Avenida Joao Dagnone, 1100, 13563-120, Sao Carlos, SP, Brazil
| | - Renata Krogh
- Laboratory of Medicinal and Computational Chemistry, Institute of Physics of Sao Carlos, University of Sao Paulo, Avenida Joao Dagnone, 1100, 13563-120, Sao Carlos, SP, Brazil
| | - Adriano D Andricopulo
- Laboratory of Medicinal and Computational Chemistry, Institute of Physics of Sao Carlos, University of Sao Paulo, Avenida Joao Dagnone, 1100, 13563-120, Sao Carlos, SP, Brazil.
| | - Fernando Coelho
- Laboratory of Synthesis of Natural Products and Drugs, Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970, Campinas, SP, Brazil.
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3
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Saadati F, Kaboudin B, Hasanloei R, Namazifar Z, Marset X, Guillena G. Manganese oxide nanoparticles supported on graphene oxide as an efficient nanocatalyst for the synthesis of 1,2,4‐oxadiazoles from aldehydes. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5838] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Fariba Saadati
- Department of Chemistry, Faculty of Science University of Zanjan Zanjan 45371‐38791 Iran
- Department of Chemistry University of British Columbia 2036 Main Mall Vancouver British Columbia V6T 1Z1 Canada
| | - Babak Kaboudin
- Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS) Gava Zang Zanjan 45137‐66731 Iran
| | - Rana Hasanloei
- Department of Chemistry, Faculty of Science University of Zanjan Zanjan 45371‐38791 Iran
| | - Zeinab Namazifar
- Department of Chemistry, Faculty of Science University of Zanjan Zanjan 45371‐38791 Iran
| | - Xavier Marset
- Departamento de Química Orgánica, e Instituto de Síntesis Orgánica (ISO) Universidad de Alicante Alicante 03080‐ Alicante Spain
| | - Gabriela Guillena
- Department of Chemistry Institute for Advanced Studies in Basic Sciences (IASBS) Gava Zang Zanjan 45137‐66731 Iran
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4
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Buttard F, Berthonneau C, Hiebel MA, Brière JF, Suzenet F. Organocatalytic aza-Michael Reaction to 3-Vinyl-1,2,4-triazines as a Valuable Bifunctional Platform. J Org Chem 2019; 84:3702-3714. [PMID: 30791682 DOI: 10.1021/acs.joc.9b00141] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
An unprecedented catalytic aza-Michael addition to substituted 3-vinyl-1,2,4-triazines, as original bifunctional platforms for the domino conjugate addition inverse-electron-demand hetero-Diels-Alder/retro-Diels-Alder ( ihDA/ rDA) reaction, was achieved using the highly acidic triflimide as an organocatalyst. Based on the use of alkoxyamine nucleophiles, this sequence not only highlights a rare example of the catalytic aza-Michael reaction to alkenylazaarenes but also proves to be useful for the elaboration of an array of biorelevant tetrahydro-[1,6]-naphthyridines.
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Affiliation(s)
- Floris Buttard
- Université d'Orléans, CNRS, ICOA, UMR 7311 , Orléans 45067 , France
| | | | | | | | - Franck Suzenet
- Université d'Orléans, CNRS, ICOA, UMR 7311 , Orléans 45067 , France
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5
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Hemming K. Recent Developments in the Synthesis, Chemistry and Applications of the Fully Unsaturated 1,2,4-Oxadiazoles. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823401103169603] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Recent major developments in the synthesis (including solid phase methodologies), chemistry and applications of the fully unsaturated 1,2,4-oxadiazole nucleus are reviewed. The review covers the years 1995–2000.
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Affiliation(s)
- Karl Hemming
- Department of Chemical and Biological Sciences, Huddersfield University, Queensgate, Huddersfield HD1 3DH, UK
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6
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Fernandes FS, Rodrigues MT, Zeoly LA, Conti C, Angolini CFF, Eberlin MN, Coelho F. Vinyl-1,2,4-oxadiazoles Behave as Nucleophilic Partners in Morita-Baylis-Hillman Reactions. J Org Chem 2018; 83:15118-15127. [PMID: 30468075 DOI: 10.1021/acs.joc.8b02402] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We describe that vinyl-oxadiazoles function as a new and efficient nucleophilic partner for the Morita-Baylis-Hillman (MBH) reaction. The reaction between 5-vinyl-3-aryl-1,2,4-oxadiazoles and aromatic and aliphatic aldehydes, catalyzed by DABCO in the absence of solvent, showed high efficiency to afford a new class of heterocyclic MBH adducts with potential biological activity on yields up to 99% and short reaction times. These synthetically attractive adducts bear a heterocyclic scaffold of large pharmaceutical and commercial interest associated with a plethora of biological effects and technological applications. We also demonstrate their synthetic usefulness by a photoinduced addition reaction to a polyfunctionalized amino alcohol.
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7
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Mailyan AK, Chen JL, Li W, Keller AA, Sternisha SM, Miller BG, Zakarian A. Short Total Synthesis of [ 15N 5]-Cylindrospermopsins from 15NH 4Cl Enables Precise Quantification of Freshwater Cyanobacterial Contamination. J Am Chem Soc 2018; 140:6027-6032. [PMID: 29672038 PMCID: PMC6312099 DOI: 10.1021/jacs.8b03071] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Fresh water cyanobacterial algal blooms represent a major health risk because these organisms produce cylindrospermopsin, a toxic, structurally complex, zwitterionic uracil-guanidine alkaloid recognized by the EPA as a dangerous drinking water contaminant. At present, the ability to detect and quantify the presence of cylindrospermospin in water samples is severely hampered by the lack of an isotopically labeled standard for analytical mass spectrometry. Herein, we present a concise, scaled total synthesis of 15N cylindrospermosin from 15N ammonium chloride, which leverages a unique stereoselective intramolecular double conjugate addition step to assemble the tricyclic guanidine core. In addition to providing the first pure isotopically labeled probe for precise quantification of this potent biotoxin in fresh water sources, our results demonstrate how unique constraints associated with isotope incorporation compel novel solutions to synthesis design.
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Affiliation(s)
- Artur K Mailyan
- Department of Chemistry and Biochemistry , University of California , Santa Barbara , California 93110 , United States
| | - Joanna L Chen
- Department of Chemistry and Biochemistry , University of California , Santa Barbara , California 93110 , United States
| | - Weiwei Li
- Bren School of Environmental Science and Management , University of California , Santa Barbara , California 93106 , United States
| | - Arturo A Keller
- Bren School of Environmental Science and Management , University of California , Santa Barbara , California 93106 , United States
| | - Shawn M Sternisha
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32310 , United States
| | - Brian G Miller
- Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32310 , United States
| | - Armen Zakarian
- Department of Chemistry and Biochemistry , University of California , Santa Barbara , California 93110 , United States
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8
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Kennedy SH, Klumpp DA. Michael Additions Involving Amino Acid Esters with Alkenyl N-Heterocycles. J Org Chem 2017; 82:10219-10225. [PMID: 28846408 DOI: 10.1021/acs.joc.7b01724] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Michael addition has been achieved with a variety of amino acid esters and 2- or 4-vinylpyridine. Similar reactions were accomplished with an alkenyl-substituted pyrimidine, pyrazine, thiazole, quinoxaline, benzoxazole, and quinolone. In reactions at a prochiral center, modest diastereoselectivities were observed with the formation of the new stereogenic carbon. NMR experiments indicate that the addition reaction is reversible under acidic conditions.
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Affiliation(s)
- Sean H Kennedy
- Department of Chemistry and Biochemistry, Northern Illinois University , DeKalb, Illinois 60115, United States
| | - Douglas A Klumpp
- Department of Chemistry and Biochemistry, Northern Illinois University , DeKalb, Illinois 60115, United States
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9
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Ajeesh Kumar AK, Nair KB, Bodke YD, Sambasivam G, Bhat KG. Design, synthesis, and evaluation of the anticancer properties of a novel series of carboxamides, sulfonamides, ureas, and thioureas derived from 1,2,4-oxadiazol-3-ylmethyl-piperazin-1-yl substituted with pyrazolo[1,5-a]pyrimidine derivatives. MONATSHEFTE FUR CHEMIE 2016. [DOI: 10.1007/s00706-016-1723-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Su MD. Model Study of the Photochemical Rearrangement Pathways of 1,2,4-Oxadiazole. Chemphyschem 2014; 15:2712-22. [DOI: 10.1002/cphc.201402069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 04/16/2014] [Indexed: 11/08/2022]
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11
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Abdel-Wahab BF, Mohamed HA, Khidre RE, El-Mansy MF. An Overview of the Literature on the Synthetic Routes to Azolyloxadiazoles. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.1760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bakr F. Abdel-Wahab
- Applied Organic Chemistry Department; National Research Centre; Dokki 12622 Egypt
| | - Hanan A. Mohamed
- Applied Organic Chemistry Department; National Research Centre; Dokki 12622 Egypt
| | - Rizk E. Khidre
- Chemistry Department, Faculty of Science; Gazan University; Gazan Saudi Arabia
- Chemical Industries Division; National Research Centre; Dokki 12622 Giza Egypt
| | - Mohamed F. El-Mansy
- Department of Chemistry; Marquette University; P.O. Box 1881 Milwaukee Wisconsin 53201-1881
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12
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Li X, Zheng A, Liu B, Yu X, Yi P. Synthesis of a Novel Triheterocyclic Framework via 1,3-Dipolar Cycloaddition of a Nitrile Oxide with Imidazo[2,1- b][1,3]thiazole-3(2 H)-ones. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.632] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaofang Li
- Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education and Hunan Province, College Key Laboratory of QSAR/QSPR; School of Chemistry and Chemical Engineering, Hunan University of Science and TechnologyXiangtan; Hunan; 411201; China
| | - Aiting Zheng
- Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education and Hunan Province, College Key Laboratory of QSAR/QSPR; School of Chemistry and Chemical Engineering, Hunan University of Science and TechnologyXiangtan; Hunan; 411201; China
| | - Bin Liu
- Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education and Hunan Province, College Key Laboratory of QSAR/QSPR; School of Chemistry and Chemical Engineering, Hunan University of Science and TechnologyXiangtan; Hunan; 411201; China
| | - Xianyong Yu
- Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education and Hunan Province, College Key Laboratory of QSAR/QSPR; School of Chemistry and Chemical Engineering, Hunan University of Science and TechnologyXiangtan; Hunan; 411201; China
| | - Pinggui Yi
- Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education and Hunan Province, College Key Laboratory of QSAR/QSPR; School of Chemistry and Chemical Engineering, Hunan University of Science and TechnologyXiangtan; Hunan; 411201; China
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13
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Piotrowski DW, Rolph M, Wei L. Substituted azabicyclo[2.2.1]heptanes via nitrenium ion rearrangement. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.12.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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14
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Ranjith Kumar R, Perumal S, Menéndez JC, Yogeeswari P, Sriram D. Antimycobacterial activity of novel 1,2,4-oxadiazole-pyranopyridine/chromene hybrids generated by chemoselective 1,3-dipolar cycloadditions of nitrile oxides. Bioorg Med Chem 2011; 19:3444-50. [PMID: 21592801 DOI: 10.1016/j.bmc.2011.04.033] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2011] [Revised: 04/04/2011] [Accepted: 04/13/2011] [Indexed: 10/18/2022]
Abstract
The 1,3-dipolar cycloaddition of nitrile oxides generated in situ from benzohydroximinoyl chloride and triethylamine to 2-aminopyranopyridine-3-carbonitriles and 2-aminochromene-3-carbonitriles occurred chemoselectively furnishing novel 1,2,4-oxadiazole-pyranopyridine/chromene hybrid heterocycles in moderate yields. In vitro screening of these compounds against Mycobacterium tuberculosis H37Rv (MTB) disclosed that the 1,2,4-oxadiazole-pyranopyridine hybrids display enhanced activity relative to the 1,2,4-oxadiazole-chromene hybrids. Among the compounds screened, 3-[3-(4-chlorophenyl)-1,2,4-oxadiazol-5-yl]-4-(2,4-dichlorophenyl)-8-[(E)-(2,4-dichlorophenyl)-methylidene]-6-methyl-5,6,7,8-tetrahydro-4H-pyrano[3,2-c]pyridin-2-amine (MIC: 0.31 μM) is 1.2, 15.2 and 24.6 times more active than standard antitubercular drugs, viz. isoniazid, ciprofloxacin and ethambutol, respectively.
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Affiliation(s)
- Raju Ranjith Kumar
- Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu, India
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15
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Li X, Zheng A, Liu B, Li G, Yu X, Yi P. Synthesis of spiro thiazolo[3,2-a]pyrimidine compounds by one-pot sequential 1,3-dipolar cycloadditions. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.578] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Kumar D, Patel G, Chavers AK, Chang KH, Shah K. Synthesis of novel 1,2,4-oxadiazoles and analogues as potential anticancer agents. Eur J Med Chem 2011; 46:3085-92. [PMID: 21481985 DOI: 10.1016/j.ejmech.2011.03.031] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2010] [Revised: 03/10/2011] [Accepted: 03/15/2011] [Indexed: 10/18/2022]
Abstract
A library of 3,5-disubstituted-1,2,4-oxadiazoles 7-9 and their bioisosters, 1,3,4-oxadiazole 14 and 1,3,4-thiadiazole 16, were synthesized and evaluated in vitro for their anticancer potential against a panel of six human cancer cell lines. The key step in the synthesis of oxadiazoles 7-9 involve coupling of amidoxime 6 with an appropriate carboxylic acid followed by thermal cyclization. The bioisosteres, 1,3,4-oxadiazole 14 and 1,3,4-thiadiazole 16 were prepared from the reaction of a common precursor diacylhydrazine 13 with thionyl chloride and Lawesson's reagent, respectively. The anticancer studies on the synthesized compounds revealed that presence of a cyclopentyloxy or n-butyloxy on the C-3 aryl ring and piperdin-4-yl or trichloromethyl at the C-5 position of 1,2,4-oxadiazole is essential for good activity. In particular, 1,2,4-oxadiazole 7i and analogue 1,3,4-thiadiazole 16 exhibited significant activity against DU145 (IC(50): 9.3 μM) and MDA-MB-231 (IC(50): 9.2 μM) cell lines, respectively.
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Affiliation(s)
- Dalip Kumar
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Rajasthan 333 031, India.
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17
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A study on the racemization step in the synthesis of pyrrolidinols via cyclic α-hydroxyimides. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.01.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Li X, Zheng A, Liu B, Yu X, Yi P. Synthesis of [1,2,4]Oxadiazolo[4,5-a]thiazolo[2,3-b]pyrimidin-9(10H)-ones via 1,3-Dipolar Cycloaddition of Nitrile Oxide to Thiazolo[3,2-a]pyrimidin-3-one Derivatives. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090181] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Burns AR, Kerr JH, Kerr WJ, Passmore J, Paterson LC, Watson AJB. Tuned methods for conjugate addition to a vinyl oxadiazole; synthesis of pharmaceutically important motifs. Org Biomol Chem 2010; 8:2777-83. [DOI: 10.1039/c001772h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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21
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Kizhnyaev VN, Pokatilov FA, Vereshchagin LI. Carbochain polymers with oxadiazole, triazole, and tetrazole cycles. POLYMER SCIENCE SERIES C 2008. [DOI: 10.1134/s1811238208010013] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Microwave-induced one-pot synthesis of 4-[3-(aryl)-1,2,4-oxadiazol-5-yl]-butan-2-ones under solvent free conditions. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.06.116] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Huang X, Wang YG. Solid-Phase Synthesis of Linked Heterocycles from a Selenopolystyrene Resin. ACTA ACUST UNITED AC 2006; 9:121-30. [PMID: 17206840 DOI: 10.1021/cc0600775] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A linked heterocycle library of isoxazoles, 1,2,3-triazoles, bicyclo[2.2.1]hepta-2,5-diene or 4-methylcyclohexa-1,3-diene and 1,2,4-oxadiazoles was prepared by solid-phase organic synthesis. Key steps on resin-bound selenium were electrophilic additions; 1,3-dipolar cycloaddition; Porco's two-step, one-pot condensation of amidoxime and carboxylate; and Diels-Alder reaction.
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Affiliation(s)
- Xian Huang
- Department of Chemistry, Zhejiang University (XixiCampus), Hangzhou 310028, P. R. China.
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24
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Kizhnyaev VN, Pokatilov AF, Vereshchagin LI, Adamova LV, Safronov AP, Smirnov AI. Synthesis and properties of carbon-chain polymers with pendant 1,3,4-oxadiazole rings. RUSS J APPL CHEM+ 2006. [DOI: 10.1134/s107042720607024x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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25
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Pace A, Buscemi S, Vivona N, Silvestri A, Barone G. Photochemistry of 1,2,4-Oxadiazoles. A DFT Study on Photoinduced Competitive Rearrangements of 3-Amino- and 3-N-Methylamino-5-perfluoroalkyl-1,2,4-oxadiazoles. J Org Chem 2006; 71:2740-9. [PMID: 16555828 DOI: 10.1021/jo0525736] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The photoinduced competitive rearrangements of 5-perfluoroalkyl-3-amino(N-alkylamino)-1,2,4-oxadiazoles have been investigated by DFT calculations and UV-vis spectroscopy. The observed product selectivity depends on the number of hydrogen atoms present in the amino moiety and involves two or three possible routes: (i) ring contraction-ring expansion (RCRE), (ii) internal-cyclization isomerization (ICI), or (iii) C3-N2 migration-nucleophilic attack-cyclization (MNAC). UV absorption and fluorescence spectra of the reactants, and vertical excitation energy values, calculated by time dependent DFT, support the involvement of a neutral singlet excited state in the photoexcitation process. The values of the standard free energy of the most stable prototropic tautomers of reactant, products, proposed reaction intermediates, and deprotonated anionic transition states allowed us to rationalize the competition among the three rearrangements, in agreement with chemical trapping experiments, in terms of: (i) the evolution of the excited state toward three stable ground-state intermediates, (ii) tautomeric and deprotonation equilibria occurring in methanol solution for each intermediate, and (iii) relative stabilization of intermediates and transition states in the thermally driven section of the reaction.
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Affiliation(s)
- Andrea Pace
- Dipartimento di Chimica Organica E. Paterno, and Dipartimento di Chimica Inorganica e Analitica S. Cannizzaro, Università degli Studi di Palermo, Viale delle Scienze, Parco d'Orleans II, Edificio 17, I-90128 Palermo, Italy.
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26
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Xu WM, Huang X, Tang E. Solid-Phase Synthesis of 1,2-Diheterocyclic-Substituted (E)-Olefins from a Supported Selenium Resin. ACTA ACUST UNITED AC 2005; 7:726-33. [PMID: 16153068 DOI: 10.1021/cc050044+] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A library of 1,2,3-triazoles, isoxazoles, 1,2,4-oxadiazoles, and isoxazoline-containing 1,2-di-heterocyclic-substituted compounds with three points of diversity linked by an E double bond were prepared. Key steps include a 1,3-dipolar cycloaddition and Porco's two-step, one-pot condensation and alpha-alkylation reaction of selenium resins.
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Affiliation(s)
- Wei-Ming Xu
- Department of Chemistry and Center of Analysis and Measurement, Zhejiang University, Hangzhou 310028, P. R. China
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27
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Synthesis of 2-aminoethyl-5-carbethoxythiazoles utilizing a Michael-like addition strategy. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.02.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Bokach NA, Kukushkin VY, Haukka M, Pombeiro AJL. Synthesis of (1,2,4-Oxadiazole)palladium(II) Complexes by [2 + 3] Cycloaddition of Nitrile Oxides to Organonitriles in the Presence of PdCl2. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400580] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Abstract
A library of isoxazole and 1,2,4-oxadiazole-containing diheterocyclic compounds has been prepared. Our strategy was explored in solution phase first as follows. PMB-protected 3-butyn-2-ol was deprotonated with nBuLi, acylated with methyl chloroformate, and then employed in a nitrile oxide 1,3-dipolar cycloaddition (benzaldehyde oxime in the presence of bleach) to afford the isoxazole-substituted carboxylic acid methyl ester. Ester saponification with aqueous NaOH followed by a two-step condensation with benzamidoxime gave the final isoxazole-oxadiazole diheterocyclic product in good yield. With some modifications, we next explored this chemistry on Wang resin, which led to 18 final products that were cleaved from polymer beads with 50% TFA in dichloromethane.
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Affiliation(s)
- Chao Quan
- Department of Chemistry, One Shields Avenue, University of California, Davis, California 95616, USA
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Bokach NA, Khripoun AV, Kukushkin VY, Haukka M, Pombeiro AJL. A Route to 1,2,4-oxadiazoles and their complexes via platinum-mediated 1,3-dipolar cycloaddition of nitrile oxides to organonitriles. Inorg Chem 2003; 42:896-903. [PMID: 12562205 DOI: 10.1021/ic026103v] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A significant activation of the Ctbd1;N group in organonitriles upon their coordination to a platinum(IV) center has been found in the reaction of [PtCl(4)(RCN)(2)] (R = Me, Et, CH(2)Ph) with the nitrile oxides 2,4,6-R'(3)C(6)H(2)CNO (R' = Me, OMe) to give the (1,2,4-oxadiazole)platinum(IV) complexes (R = Me, R' = Me (1); R = Et, R' = Me (2); R = Et, R' = OMe (3); R = CH(2)Ph, R' = Me (4)); the [2 + 3] cycloaddition was performed under mild conditions (unless poor solubility of [PtCl(4)(RCN)(2)] precludes the reaction) starting even from complexed acetonitrile and propionitrile, which exhibit low reactivity in the free state. The reaction between complexes 2-4 and 1 equiv of Ph(3)P=CHCO(2)Me in CH(2)Cl(2) leads to the appropriate platinum(II) complexes (5-7); the reduction failed only in the case of 1 insofar as this complex is insoluble in the most common organic solvents. All the platinum compounds were characterized by elemental analyses, FAB mass spectrometry, and IR and (1)H, (13)C((1)H), and (195)Pt NMR spectroscopies, and three of them also by X-ray crystallography. The oxadiazoles formed in the course of the metal-mediated reaction were liberated almost quantitatively from their Pt(IV) complexes by reaction of the latter (complexes 2-4) with an excess of pyridine in chloroform, giving free 1,2,4-oxadiazoles and trans-[PtCl(4)(pyridine)(2)]; the sequence of the Pt(IV)-mediated [2 + 3] cycloaddition and the liberation opens up an alternative route for the preparation of this important class of heterocycles.
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31
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Deegan TL, Nitz TJ, Cebzanov D, Pufko DE, Porco JA. Parallel synthesis of 1,2,4-oxadiazoles using CDI activation. Bioorg Med Chem Lett 1999; 9:209-12. [PMID: 10021930 DOI: 10.1016/s0960-894x(98)00712-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
1,2,4-Oxadiazoles have been prepared in parallel using 1,1'-carbonyldiimidazole (CDI) as a reagent for both formation and cyclodehydration of O-acyl benzamidoximes. The use of CDI facilitates parallel purification of the oxadiazole products by simple liquid-liquid extraction and filtration.
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Affiliation(s)
- T L Deegan
- Argonaut Technologies, San Carlos, CA 94070, USA
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