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Basavaiah D, Golime G, Banoth S, Todeti S. An umpolung strategy for intermolecular [2 + 2 + 1] cycloaddition of aryl aldehydes and nitriles: a facile access to 2,4,5-trisubstituted oxazoles. Chem Sci 2022; 13:8080-8087. [PMID: 35919435 PMCID: PMC9278343 DOI: 10.1039/d2sc00046f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 06/10/2022] [Indexed: 11/21/2022] Open
Abstract
We have described the first example of an umpolung strategy for intermolecular [2 + 2 + 1] cycloaddition between two aryl aldehydes and a nitrile under the influence of TMSOTf that proceeds through the formation of N–C, O–C and C–C bonds providing a simple synthetic protocol for obtaining 2,4,5-trisubstituted oxazoles. An unprecedented intermolecular [2 + 2 + 1] cycloaddition strategy between two aryl aldehydes and a nitrile, wherein one of the aryl aldehydes serves as a carbanion (or equivalent) in the presence of TMSOTf for obtaining oxazole framework is presented.![]()
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Affiliation(s)
- Deevi Basavaiah
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
| | | | - Shivalal Banoth
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
| | - Saidulu Todeti
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
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2
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Cnudde M, Brünink D, Doltsinis NL, Strassert CA. Tetradentate N^N°N^N-type luminophores for Pt(II) complexes: Synthesis, photophysical and quantum-chemical investigation. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Saundane AR, Manjunatha Y. Synthesis, antimicrobial and antioxidant activities of 2-oxo-6-phenyl-2-yl-4-(2′-phenyl-5′-substituted 1H-indol-3′-yl)-1,2-dihydro pyridin-3-carbonitriles and their derivatives. ARAB J CHEM 2016. [DOI: 10.1016/j.arabjc.2011.06.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Guo J, Zhang C, Bi J, Zhang H, Bai C, Hu Y, Zhang X. Cobalt complexes bearing pyridine-imino ligands with bulky aryl substituents: Synthesis, characterization, and 1,3-butadiene polymerization behaviors. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.05.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chang YY, Ho TL, Chung WS. Deformative transition of the Menschutkin reaction and helical atropisomers in a congested polyheterocyclic system. J Org Chem 2014; 79:9970-8. [PMID: 25279831 DOI: 10.1021/jo501815y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A 4,7-phenanthroline polycyclic 1A designed for probing the limits of the Menschutkin reaction was synthesized in a six-step sequence. The rotational barrier of the phenyl ring nearby the N-methyl group in rac-2A was estimated to be ≫ 18.1 kcal/mol from VT-NMR experiments, making them a new type of helical atropisomer. The methylation rate constants of 9 and 1A with MeI was found to be 2.22 × 10(-4) and 9.62 × 10(-6) s(-1) mol(-1) L, respectively; thus, the formation rate of (P/M)-2A is one of the slowest rates ever reported for a Menschutkin reaction. The N-methyl protons in (P/M)-2A exhibit a significant upfield shift (Δδ 1.0 ppm) in its (1)H NMR, compared to those without a nearby phenyl, indicating a strong CH-π interaction is involved. Conformational flexibility in dipyridylethene 9 is clearly shown by its complexation with BH3 to form helical atropisomers (P,P/M,M)-10. The pKa values of the conjugate acids of 1A and 9 in acetonitrile were determined to be 4.65 and 5.07, respectively, which are much smaller compared to that of pyridine 14a (pKa = 12.33), implying that the basicity, nucleophilicity, and amine alkylation rates of 1A and 9 are markedly decreased by the severe steric hindrance of the flanking phenyl rings in the polyheterocycles.
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Affiliation(s)
- Yung-Yu Chang
- Department of Applied Chemistry, National Chiao-Tung University , Hsinchu 30050, Taiwan-ROC
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6
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Djurendić EA, Klisurić OR, Szécsi M, Sakač MN, Jovanović-Šanta SS, Ignáth I, Kojić VV, Oklješa AM, Savić MP, Penov-Gaši KM. X-ray structural analysis and antitumor activity of new salicylic acid derivatives. Struct Chem 2014. [DOI: 10.1007/s11224-014-0450-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Yasuda D, Takahashi K, Ohe T, Nakamura S, Mashino T. Antioxidant activities of 5-hydroxyoxindole and its 3-hydroxy-3-phenacyl derivatives: The suppression of lipid peroxidation and intracellular oxidative stress. Bioorg Med Chem 2013; 21:7709-14. [DOI: 10.1016/j.bmc.2013.10.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 10/15/2013] [Accepted: 10/17/2013] [Indexed: 10/26/2022]
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8
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Mojarrab M, Soltani R, Aliabadi A. Pyridine Based Chalcones: Synthesis and Evaluation of Antioxidant Activity of 1-Phenyl-3-(pyridin-2-yl)prop-2-en-1-one Derivatives. Jundishapur J Nat Pharm Prod 2013; 8:125-30. [PMID: 24624201 PMCID: PMC3941900 DOI: 10.17795/jjnpp-10024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2012] [Revised: 04/12/2013] [Accepted: 04/29/2013] [Indexed: 12/02/2022] Open
Abstract
Background Natural chalcones and also their synthetic derivatives have attracted increasing attention due to various pharmacological applications. Development and discovery of new chalcones with antioxidant activities is one of the attracting areas in medicinal and natural product chemistry. Objectives In the present study, a new series of pyridine based chalcones was synthesized and their antioxidant capacity was evaluated by beta carotene bleaching (BCB), DPPH free radical scavenging, ferrous ion chelating (FIC) activity and Trolox equivalent antioxidant capacity (TEAC) methods. Materials and Methods All compounds were synthesized via an aldol condensation procedure in methanol or ethanol solvent at room temperature and characterization was carried out by 1HNMR, IR and MS spectroscopic methods. Related melting points were also measured for each compound. Results Fortunately, compounds 3e (16.53 ± 1.21 µg/mL), 3g (58.85 ± 1.10 µg/mL) and 3i (58.73 ± 12.94 µg/mL) showed higher antioxidant activity (EC50 ± SD) in comparison with quercetin (87.24 ± 3.93 µg/mL) as reference agent in ferrous ion chelating method. Furthermore, compounds 3g (4.82 ± 0.11 µg/mL) and 3h (6.33 ± 0.30 µg/mL) also exhibited an acceptable antioxidant property compared to Trolox (3.83 ± 0.22 µg/mL) in TEAC method. None of synthesized compounds demonstrated significant antioxidant activity in DPPH free radical scavenging as well as beta carotene bleaching tests. Conclusions According to the obtained data, synthesized pyridine based chalcones (3a-3j) could be proposed as potential antioxidant lead compounds.
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Affiliation(s)
- Mahdi Mojarrab
- Department of Pharmacognosy and Pharmaceutical Biotechnology, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, IR Iran
| | - Roozbeh Soltani
- Students Research Committee, Kermanshah University of Medical Sciences, Kermanshah, IR Iran ; Department of Medicinal Chemistry, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, IR Iran
| | - Alireza Aliabadi
- Department of Medicinal Chemistry, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, IR Iran
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Celik I, Akkurt M, Gezegen H, Kazak C. 2-(4-Bromo-phen-yl)-4-(4-meth-oxy-phen-yl)-6,7,8,9-tetra-hydro-5H-cyclo-hepta-[b]pyridine. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o956. [PMID: 23795115 PMCID: PMC3685096 DOI: 10.1107/s1600536813013913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Accepted: 05/20/2013] [Indexed: 05/27/2023]
Abstract
In the title compound, C23H22BrNO, the cycloheptane ring adopts a chair conformation. The pyridine ring makes dihedral angles of 58.63 (15) and 8.27 (16)° with the benzene rings. The dihedral angle between the benzene rings is 56.68 (17)°. The crystal packing features C—Br⋯π interactions [Br⋯centroid distances= 3.813 (2) and 3.839 (2) Å; C—Br⋯centroid = 126.25 (10) and 138.31 (10)°, respectively, forming a three dimensional supramolecular architecture.
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Affiliation(s)
- Ismail Celik
- Department of Physics, Faculty of Sciences, Cumhuriyet University, 58140 Sivas, Turkey
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Yasuda D, Takahashi K, Kakinoki T, Tanaka Y, Ohe T, Nakamura S, Mashino T. Synthesis, radical scavenging activity and structure–activity relationship of uric acid analogs. MEDCHEMCOMM 2013. [DOI: 10.1039/c2md20287e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Andrés JI, De Angelis M, Alcázar J, Iturrino L, Langlois X, Dedeurwaerdere S, Lenaerts I, Vanhoof G, Celen S, Bormans G. Synthesis, In Vivo Occupancy, and Radiolabeling of Potent Phosphodiesterase Subtype-10 Inhibitors as Candidates for Positron Emission Tomography Imaging. J Med Chem 2011; 54:5820-35. [DOI: 10.1021/jm200536d] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- José-Ignacio Andrés
- Medicinal Chemistry, Janssen Research & Development, Janssen-Cilag SA, C/Jarama 75, 45007 Toledo, Spain
| | - Meri De Angelis
- Medicinal Chemistry, Janssen Research & Development, Janssen-Cilag SA, C/Jarama 75, 45007 Toledo, Spain
| | - Jesús Alcázar
- Medicinal Chemistry, Janssen Research & Development, Janssen-Cilag SA, C/Jarama 75, 45007 Toledo, Spain
| | - Laura Iturrino
- Medicinal Chemistry, Janssen Research & Development, Janssen-Cilag SA, C/Jarama 75, 45007 Toledo, Spain
| | - Xavier Langlois
- Neuroscience, Janssen Research & Development, Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Stefanie Dedeurwaerdere
- Neuroscience, Janssen Research & Development, Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Ilse Lenaerts
- Neuroscience, Janssen Research & Development, Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Greet Vanhoof
- Neuroscience, Janssen Research & Development, Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Sofie Celen
- Laboratory for Radiopharmacy and IMIR, Faculty of Pharmaceutical Sciences, KU Leuven, Herestraat 49, B-3000 Leuven, Belgium
| | - Guy Bormans
- Laboratory for Radiopharmacy and IMIR, Faculty of Pharmaceutical Sciences, KU Leuven, Herestraat 49, B-3000 Leuven, Belgium
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12
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Tung YS, Coumar MS, Wu YS, Shiao HY, Chang JY, Liou JP, Shukla P, Chang CW, Chang CY, Kuo CC, Yeh TK, Lin CY, Wu JS, Wu SY, Liao CC, Hsieh HP. Scaffold-Hopping Strategy: Synthesis and Biological Evaluation of 5,6-Fused Bicyclic Heteroaromatics To Identify Orally Bioavailable Anticancer Agents. J Med Chem 2011; 54:3076-80. [DOI: 10.1021/jm101027s] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yen-Shih Tung
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
- Department of Chemistry, National Tsing Hua University, 101, Section 2, Guangfu Road, Hsinchu 300, Taiwan, ROC
| | - Mohane Selvaraj Coumar
- Centre for Bioinformatics, School of Life Sciences, Pondicherry University, Kalapet, Puducherry 605014, India
| | - Yu-Shan Wu
- Department of Chemistry, Tunghai University, 181 Taichung Harbor Road Section 3, Taichung 407, Taiwan, ROC
| | - Hui-Yi Shiao
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Jang-Yang Chang
- National Institute of Cancer Research, National Health Research Institutes, Tainan 704, Taiwan, ROC
| | - Jing-Ping Liou
- College of Pharmacy, Taipei Medical University, Taipei 110, Taiwan, ROC
| | - Paritosh Shukla
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Chun-Wei Chang
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Chi-Yen Chang
- National Institute of Cancer Research, National Health Research Institutes, Tainan 704, Taiwan, ROC
| | - Ching-Chuan Kuo
- National Institute of Cancer Research, National Health Research Institutes, Tainan 704, Taiwan, ROC
| | - Teng-Kuang Yeh
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Chin-Yu Lin
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Jian-Sung Wu
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Su-Ying Wu
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
| | - Chun-Chen Liao
- Department of Chemistry, National Tsing Hua University, 101, Section 2, Guangfu Road, Hsinchu 300, Taiwan, ROC
- Department of Chemistry, Chung Yuan Christian University, Chungli 320, Taiwan, ROC
| | - Hsing-Pang Hsieh
- Institute of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan, Miaoli County 350, Taiwan, ROC
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Aranda Perez AI, Biet T, Graule S, Agou T, Lescop C, Branda NR, Crassous J, Réau R. Chiral and extended π-conjugated bis(2-pyridyl)phospholes as assembling N,P,N pincers for coordination-driven synthesis of supramolecular [2,2]paracyclophane analogues. Chemistry 2010; 17:1337-51. [PMID: 21243702 DOI: 10.1002/chem.201001862] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Indexed: 11/11/2022]
Abstract
Chiral, π-conjugated 3,4-butano-1-phenyl-2,5-bis(2-pyridyl)phosphole derivatives 1a(2,2') and 1a(3) with chiral trans-1,2-diol moieties and fused pinene derivatives, respectively, were prepared from the corresponding chiral diynes by using the Fagan-Nugent method. Their UV/Vis absorption and chiroptical properties (optical rotation and circular dichroism) were studied. Their behavior as N,P,N chelates towards coordination of Cu(I) and formation of chiral supramolecular assemblies with π-conjugated ditopic dicyano ligands was investigated. Chiral C(2)-symmetric rectangles that are [2,2]paracyclophane analogues were obtained, as demonstrated by X-ray crystallography. During the course of this study, the first stable water-soluble phosphole derivative (1a(2)·2 HCl) was prepared. Furthermore, achiral 3,4-butano-1-phenyl-2,5-bis(aza[4]helicene)phosphole 1a(4) was synthesized and displays extended π conjugation. A supramolecular rectangle was obtained by coordination to Cu(I) and assembly with a dicyano stilbene. This coordination-driven supramolecular assembly contains a total of four aza[4]helicene moieties and displays two types of π-π stacking interactions in the solid state, that is, between two helicene moieties and between one helicene and a bridging dicyano ligand. All the supramolecular arrangements are discussed by comparing them with previous work on the parent 3,4-butano-1-phenyl-2,5-bis(2-pyridyl)phosphole.
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Affiliation(s)
- Ana Isabel Aranda Perez
- Sciences Chimiques de Rennes, UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
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Sayed HH, Morsy EMH, Flefel EM. Synthesis and Reactions of Some Novel Nicotinonitrile, Thiazolotriazole, and Imidazolotriazole Derivatives for Antioxidant Evaluation. SYNTHETIC COMMUN 2010. [DOI: 10.1080/00397910903079631] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Hayam H. Sayed
- a Photochemistry Department , National Research Center , Dokki, Cairo, Egypt
| | - Eman M. H. Morsy
- a Photochemistry Department , National Research Center , Dokki, Cairo, Egypt
| | - Eman M. Flefel
- a Photochemistry Department , National Research Center , Dokki, Cairo, Egypt
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15
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Cheng LX, Jin XL, Teng QF, Chang J, Yao XJ, Dai F, Qian YP, Tang JJ, Li XZ, Zhou B. Antioxidant activity of α-pyridoin and its derivatives: possible mechanism. Org Biomol Chem 2010; 8:1058-63. [DOI: 10.1039/b922673g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Antioxidant activity of benzoxazolinonic and benzothiazolinonic derivatives in the LDL oxidation model. Bioorg Med Chem 2009; 17:7823-30. [DOI: 10.1016/j.bmc.2009.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2009] [Accepted: 09/10/2009] [Indexed: 11/21/2022]
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17
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Bagdanoff JT, Donoviel MS, Nouraldeen A, Tarver J, Fu Q, Carlsen M, Jessop TC, Zhang H, Hazelwood J, Nguyen H, Baugh SDP, Gardyan M, Terranova KM, Barbosa J, Yan J, Bednarz M, Layek S, Courtney LF, Taylor J, Digeorge-Foushee AM, Gopinathan S, Bruce D, Smith T, Moran L, O'Neill E, Kramer J, Lai Z, Kimball SD, Liu Q, Sun W, Yu S, Swaffield J, Wilson A, Main A, Carson KG, Oravecz T, Augeri DJ. Inhibition of sphingosine-1-phosphate lyase for the treatment of autoimmune disorders. J Med Chem 2009; 52:3941-53. [PMID: 19489538 DOI: 10.1021/jm900278w] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
During nearly a decade of research dedicated to the study of sphingosine signaling pathways, we identified sphingosine-1-phosphate lyase (S1PL) as a drug target for the treatment of autoimmune disorders. S1PL catalyzes the irreversible decomposition of sphingosine-1-phosphate (S1P) by a retro-aldol fragmentation that yields hexadecanaldehyde and phosphoethanolamine. Genetic models demonstrated that mice expressing reduced S1PL activity had decreased numbers of circulating lymphocytes due to altered lymphocyte trafficking, which prevented disease development in multiple models of autoimmune disease. Mechanistic studies of lymphoid tissue following oral administration of 2-acetyl-4(5)-(1(R),2(S),3(R),4-tetrahydroxybutyl)-imidazole (THI) 3 showed a clear relationship between reduced lyase activity, elevated S1P levels, and lower levels of circulating lymphocytes. Our internal medicinal chemistry efforts discovered potent analogues of 3 bearing heterocycles as chemical equivalents of the pendant carbonyl present in the parent structure. Reduction of S1PL activity by oral administration of these analogues recapitulated the phenotype of mice with genetically reduced S1PL expression.
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Guirado A, Zapata A, Andreu R, Ramírez de Arellano C, Jones PG, Gálvez J. Electrochemical synthesis of 2-arylimino-4,5-di(2-furyl)-1,3-dioxoles and (E)-1,2-di(2-furyl)vinylene bis(N-arylchloroformimidates). HF and B3LYP computational study of the topomerization mechanism of aryliminodioxoles. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.02.082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2,2′-Pyridoin derivatives protect HL-60 cells against oxidative stress. Bioorg Med Chem Lett 2008; 18:5290-3. [DOI: 10.1016/j.bmcl.2008.08.057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Revised: 08/13/2008] [Accepted: 08/15/2008] [Indexed: 11/18/2022]
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20
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Azide and oxo bridged ferromagnetic clusters: Three face-shared tetracubane Ni(II)/Co(II) hexamers and a wheel-shaped SMM-like Co(II) heptamer. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.03.020] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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El-Deeb IM, Ryu JC, Lee SH. Synthesis of new N-arylpyrimidin-2-amine derivatives using a palladium catalyst. Molecules 2008; 13:818-30. [PMID: 18463584 PMCID: PMC6245071 DOI: 10.3390/molecules13040818] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2008] [Revised: 04/08/2008] [Accepted: 04/08/2007] [Indexed: 11/19/2022] Open
Abstract
New N-aryl-4-(pyridin-3-yl)pyrimidin-2-amine derivatives were synthesized from the corresponding amines, applying optimized Buchwald-Hartwig amination conditions using dichlorobis(triphenylphosphine)Pd(II), xantphos and sodium tert-butoxide in refluxing toluene under a nitrogen atmosphere. The target N-aryl derivatives were obtained in moderate to good yields ranging from 27% to 82%. The procedure described could be widely employed for the preparation of new heterocyclic compounds. The structures of the new compounds were confirmed by FT-NMR, FT-IR and elemental analysis.
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Affiliation(s)
- Ibrahim Mustafa El-Deeb
- Department of Biomolecular Science, University of Science and Technology, Daejon, Korea; E-mail:
| | - Jae Chun Ryu
- Life Sciences Research Division, Korea Institute of Science & Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea; E-mail:
| | - So Ha Lee
- Department of Biomolecular Science, University of Science and Technology, Daejon, Korea; E-mail:
- Life Sciences Research Division, Korea Institute of Science & Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea; E-mail:
- Author to whom correspondence should be addressed; E-mail: ; Tel: (+82) 2 9586834
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Rastkari N, Abdollahi M, Ahmadkhaniha R, Shafiee A. Syntheses and biological activities of benzimidazolo[2,1-b] benzo[e]thiazepin-5(10H)-ones. Arch Pharm (Weinheim) 2007; 341:49-54. [PMID: 18072242 DOI: 10.1002/ardp.200700099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Substituted benzimidazolo[2,1-b]benzo[e]thiazepin-5(10H)-one derivatives were prepared in moderate to good yield by reaction of mercapto benzimidazole derivatives with 2-chloromethylbenzoyl chloride as a coupling component. Their structures were confirmed by elemental analysis, IR, NMR, and MS. Their antioxidant properties were evaluated by several methods: scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals, reducing power assay, and inhibition of lipid peroxidation. In DPPH assay, 3h exhibited an activity stronger than trolox. In the reducing power assay and inhibition of lipid peroxidation, compound 3a was more active than 3h and similar to trolox. The antidiabetic effect was also determined, and the antidiabetic activities were correlated with their antioxidant properties, compound 3a was the most active compound in the in-vivo experiments.
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Affiliation(s)
- Noushin Rastkari
- Center for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
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Kerckhoffs JMCA, Peberdy JC, Meistermann I, Childs LJ, Isaac CJ, Pearmund CR, Reudegger V, Khalid S, Alcock NW, Hannon MJ, Rodger A. Enantiomeric resolution of supramolecular helicates with different surface topographies. Dalton Trans 2007:734-42. [PMID: 17279244 DOI: 10.1039/b614093a] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantiomeric resolution of an extended range of di-metallo supramolecular triple-helical molecules are reported. The ligands for all complexes are symmetric with two units containing an aryl group linked via an imine bond to a pyridine. Alkyl substituents have been attached in different positions on the ligand backbone. Previous work on the parent compound, whose molecular formula is [Fe(2)(C(25)H(20)N(4))(3)]Cl4, showed that it could be resolved into enantiomerically pure solutions using cellulose and 20 mM aqueous sodium chloride. In this work a range of mobile phases have been investigated to see if the separation and speed of elution could be increased and the amount of NaCl co-eluted with the compounds decreased. Methanol, ethanol and acetonitrile were considered, together with aqueous NaCl : organic mixtures. Effective separation was most often achieved when using 90% acetonitrile : 10% 20 mM NaCl (aq) w/v, which gives scope for scaling up to incorporate the use of HPLC. The overall most efficient (i.e. fastest) separation was generally achieved where the cellulose column was packed with 20 mM NaCl (aq) and the column first eluted with 100% acetonitrile, then with 75% ethanol : 25% 20 mM NaCl (aq) until the M enantiomer had fully eluted and finally with 90% acetonitrile : 10% 20 mM NaCl (aq) until the P enantiomer had been collected. The sequence of eluents ensured minimum NaCl accompanying the enantiomers and minimum total solvent being required to elute the enantiomers, especially the second one, from the column. No helicate with a methyl group on the imine bond could be resolved and methyl groups on the pyridine rings also have an adverse effect on resolution.
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