51
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Cao S, Realegeno S, Pant A, Satheshkumar PS, Yang Z. Suppression of Poxvirus Replication by Resveratrol. Front Microbiol 2017; 8:2196. [PMID: 29204136 PMCID: PMC5698801 DOI: 10.3389/fmicb.2017.02196] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 10/26/2017] [Indexed: 01/08/2023] Open
Abstract
Poxviruses continue to cause serious diseases even after eradication of the historically deadly infectious human disease, smallpox. Poxviruses are currently being developed as vaccine vectors and cancer therapeutic agents. Resveratrol is a natural polyphenol stilbenoid found in plants that has been shown to inhibit or enhance replication of a number of viruses, but the effect of resveratrol on poxvirus replication is unknown. In the present study, we found that resveratrol dramatically suppressed the replication of vaccinia virus (VACV), the prototypic member of poxviruses, in various cell types. Resveratrol also significantly reduced the replication of monkeypox virus, a zoonotic virus that is endemic in Western and Central Africa and causes human mortality. The inhibitory effect of resveratrol on poxviruses is independent of VACV N1 protein, a potential resveratrol binding target. Further experiments demonstrated that resveratrol had little effect on VACV early gene expression, while it suppressed VACV DNA synthesis, and subsequently post-replicative gene expression.
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Affiliation(s)
- Shuai Cao
- Division of Biology, Kansas State University, Manhattan, KS, United States
| | - Susan Realegeno
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Anil Pant
- Division of Biology, Kansas State University, Manhattan, KS, United States
| | - Panayampalli S. Satheshkumar
- Poxvirus and Rabies Branch, Division of High-Consequence Pathogens and Pathology, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, United States
| | - Zhilong Yang
- Division of Biology, Kansas State University, Manhattan, KS, United States
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52
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Yang H, Wang E, Yang P, Lv H, Zhang X. Pyridine-Directed Asymmetric Hydrogenation of 1,1-Diarylalkenes. Org Lett 2017; 19:5062-5065. [DOI: 10.1021/acs.orglett.7b02262] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hailong Yang
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Erfei Wang
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Ping Yang
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Hui Lv
- Key Laboratory of Biomedical Polymers of Ministry of Education & College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, China
| | - Xumu Zhang
- Department
of Chemistry, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
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53
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Zhang W, Chen P, Liu G. Copper-Catalyzed Arylation of Benzylic C–H bonds with Alkylarenes as the Limiting Reagents. J Am Chem Soc 2017; 139:7709-7712. [DOI: 10.1021/jacs.7b03781] [Citation(s) in RCA: 105] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Wen Zhang
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Pinhong Chen
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Guosheng Liu
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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54
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Efficient N -heterocyclic carbene nickel pincer complexes catalyzed cross coupling of benzylic ammonium salts with boronic acids. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2016.09.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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55
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Wang T, Yang S, Xu S, Han C, Guo G, Zhao J. Palladium catalyzed Suzuki cross-coupling of benzyltrimethylammonium salts via C–N bond cleavage. RSC Adv 2017. [DOI: 10.1039/c7ra02549a] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
A Pd catalyzed Suzuki cross-coupling of a benzyltrimethylammonium salt is described. This reaction offers a highly efficient approach to diarylmethanes and also paves the way for the application of benzyltrimethylammonium salts in Pd catalyzed cross-coupling reactions.
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Affiliation(s)
- Tao Wang
- National Research Center for Carbohydrate Synthesis
- Key Laboratory of Chemical Biology
- China
- College of Chemistry & Chemical Engineering
- Jiangxi Normal University
| | - Shuwu Yang
- College of Chemistry & Chemical Engineering
- Jiangxi Normal University
- Nanchang
- P. R. China
| | - Silin Xu
- College of Chemistry & Chemical Engineering
- Jiangxi Normal University
- Nanchang
- P. R. China
| | - Chunyu Han
- College of Chemistry & Chemical Engineering
- Jiangxi Normal University
- Nanchang
- P. R. China
| | - Ge Guo
- College of Chemistry & Chemical Engineering
- Jiangxi Normal University
- Nanchang
- P. R. China
| | - Junfeng Zhao
- National Research Center for Carbohydrate Synthesis
- Key Laboratory of Chemical Biology
- China
- College of Chemistry & Chemical Engineering
- Jiangxi Normal University
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56
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Zhou T, Li S, Huang B, Li C, Zhao Y, Chen J, Chen A, Xiao Y, Liu L, Zhang J. Phosphine-catalyzed Friedel–Crafts reaction of naphthols with para-quinone methides: expedient access to triarylmethanes. Org Biomol Chem 2017; 15:4941-4945. [DOI: 10.1039/c7ob00911a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel phosphine-catalyzed Friedel–Crafts reaction of naphthols with para-quinone methides has been developed.
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Affiliation(s)
- Tao Zhou
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Shenhuan Li
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Ben Huang
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Cao Li
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Yang Zhao
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Jieqiong Chen
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Aoling Chen
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Yuanjin Xiao
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Lu Liu
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
| | - Junliang Zhang
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200241
- China
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57
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Chelucci G. One-pot Hydrodehalogenation-Hydrogenation of Alkenyl Bromides with Nickel Boride: an Easy Access to Di- and Trisubstituted Ethanes from Aldehydes. ChemistrySelect 2016. [DOI: 10.1002/slct.201600769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Giorgio Chelucci
- Dipartimento di Agraria; Università di Sassari; viale Italia 39 I-07100 Sassari Italy
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58
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Reyes-Gutiérrez PE, Kapal T, Klepetářová B, Šaman D, Pohl R, Zawada Z, Kužmová E, Hájek M, Teplý F. Structural revisions of small molecules reported to cross-link G-quadruplex DNA in vivo reveal a repetitive assignment error in the literature. Sci Rep 2016; 6:23499. [PMID: 27005677 PMCID: PMC4804300 DOI: 10.1038/srep23499] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 02/02/2016] [Indexed: 11/09/2022] Open
Abstract
Two molecules of mistaken identity are addressed. Uncovering these assignment errors led us to formulate more general guidelines about additional misassignments in cases of published bis-imines derived from 1,2-phenylenediamine and hydroxybenzaldehydes having no substituent in ortho-positions. The main purpose of this article is to highlight this repetitive assignment error in the literature and thus increase the likelihood of correct assignments in future papers.
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Affiliation(s)
- Paul E Reyes-Gutiérrez
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Tomáš Kapal
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Blanka Klepetářová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - David Šaman
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Zbigniew Zawada
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Erika Kužmová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Miroslav Hájek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
| | - Filip Teplý
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo n. 2, 166 10 Prague 6, Czech Republic
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59
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Friedfeld MR, Shevlin M, Margulieux GW, Campeau LC, Chirik PJ. Cobalt-Catalyzed Enantioselective Hydrogenation of Minimally Functionalized Alkenes: Isotopic Labeling Provides Insight into the Origin of Stereoselectivity and Alkene Insertion Preferences. J Am Chem Soc 2016; 138:3314-24. [DOI: 10.1021/jacs.5b10148] [Citation(s) in RCA: 146] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Max R. Friedfeld
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Michael Shevlin
- Department of Process & Analytical Chemistry, Merck Research Laboratories, Rahway, New Jersey 07065, United States
| | - Grant W. Margulieux
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Louis-Charles Campeau
- Department of Process & Analytical Chemistry, Merck Research Laboratories, Rahway, New Jersey 07065, United States
| | - Paul J. Chirik
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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60
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Liu M, Zhang J, Zhou H, Yang H, Xia C, Jiang G. Efficient hydroarylation and hydroalkenylation of vinylarenes by Brønsted acid catalysis. RSC Adv 2016. [DOI: 10.1039/c6ra16627j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Brønsted acid Tf2NH-catalyzed hydroarylation and hydroalkenylation of 4 vinylarenes under mild reaction conditions is herein shown to provide access to 1,1-diarylalkane scaffolds and trans-1,3-diaryl-1-butenes in high yields and with excellent regioselectivity.
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Affiliation(s)
- Muwen Liu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou
| | - Jinlong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou
| | - Hui Zhou
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou
| | - Huameng Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou
| | - Gaoxi Jiang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Suzhou Research Institute of LICP
- Lanzhou Institute of Chemical Physics (LICP)
- Chinese Academy of Sciences
- Lanzhou
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61
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Yang T, Li S, Zhang X, Pang X, Lin Q, Cao J. Resveratrol, sirtuins, and viruses. Rev Med Virol 2015; 25:431-45. [DOI: 10.1002/rmv.1858] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 09/19/2015] [Indexed: 12/25/2022]
Affiliation(s)
- Tao Yang
- College of Food Science and Technology; Central South University of Forestry and Technology; Changsha Hunan Province China
| | - Shugang Li
- Construction Corps Key Laboratory of Deep Processing on Featured Agricultural Products in South Xinjiang; Tarim University; Alar Xinjiang China
| | - Xuming Zhang
- Department of Microbiology and Immunology; University of Arkansas for Medical Sciences; Little Rock AR USA
| | - Xiaowu Pang
- Departments of Oral Pathology, College of Dentistry; Howard University; Washington DC USA
| | - Qinlu Lin
- College of Food Science and Technology; Central South University of Forestry and Technology; Changsha Hunan Province China
| | - Jianzhong Cao
- College of Food Science and Technology; Central South University of Forestry and Technology; Changsha Hunan Province China
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62
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Kvansakul M, Hinds MG. The Bcl-2 family: structures, interactions and targets for drug discovery. Apoptosis 2015; 20:136-50. [PMID: 25398535 DOI: 10.1007/s10495-014-1051-7] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Two phylogenetically and structurally distinct groups of proteins regulate stress induced intrinsic apoptosis, the programmed disassembly of cells. Together they form the B cell lymphoma-2 (Bcl-2) family. Bcl-2 proteins appeared early in metazoan evolution and are identified by the presence of up to four short conserved sequence blocks known as Bcl-2 homology (BH) motifs, or domains. The simple BH3-only proteins bear only a BH3-motif and are intrinsically disordered proteins and antagonize or activate the other group, the multi-motif Bcl-2 proteins that have up to four BH motifs, BH1-BH4. Multi-motif Bcl-2 proteins are either pro-survival or pro-apoptotic in action and have remarkably similar α-helical bundle structures that provide a binding groove formed from the BH1, BH2, and BH3-motifs for their BH3-bearing antagonists. In mammals a network of interactions between Bcl-2 members regulates mitochondrial outer membrane permeability (MOMP) and efflux of cytochrome c and other death inducing factors from mitochondria to initiate the apoptotic caspase cascade, but the molecular events leading to MOMP are uncertain. Dysregulation of the Bcl-2 family occurs in many diseases and pathogenic viruses have assimilated pro-survival Bcl-2 proteins to evade immune responses. Their role in disease has made the Bcl-2 family the focus of drug design attempts and clinical trials are showing promise for 'BH3-mimics', drugs that mimic the ability of BH3-only proteins to neutralize selected pro-survival proteins to induce cell death in tumor cells. This review focuses on the structural biology of Bcl-2 family proteins, their interactions and attempts to harness them as targets for drug design.
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Affiliation(s)
- Marc Kvansakul
- La Trobe Institute for Molecular Science, La Trobe University, Bundoora, 3086, Australia,
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63
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Kim A, Kim SG. Lewis-Acid-Catalysed Friedel-Crafts Alkylation of Donor-Acceptor Cyclopropanes with Electron-Rich Benzenes to Generate 1,1-Diarylalkanes. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500856] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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64
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Tollefson EJ, Hanna LE, Jarvo ER. Stereospecific nickel-catalyzed cross-coupling reactions of benzylic ethers and esters. Acc Chem Res 2015. [PMID: 26197033 PMCID: PMC4956245 DOI: 10.1021/acs.accounts.5b00223] [Citation(s) in RCA: 204] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
This Account presents the development of a suite of stereospecific alkyl-alkyl cross-coupling reactions employing nickel catalysts. Our reactions complement related nickel-catalyzed stereoconvergent cross-coupling reactions from a stereochemical and mechanistic perspective. Most reactions of alkyl electrophiles with low-valent nickel complexes proceed through alkyl radicals and thus are stereoablative; the correct enantioselective catalyst can favor the formation of one enantiomer. Our reactions, in contrast, are stereospecific. Enantioenriched ethers and esters are cleanly converted to cross-coupled products with high stereochemical fidelity. While mechanistic details are still to be refined, our results are consistent with a polar, two-electron oxidative addition that avoids the formation of radical intermediates. This reactivity is unusual for a first-row transition metal. The cross-coupling reactions engage a range of benzylic ethers and esters, including methyl ethers, tetrahydropyrans, tetrahydrofurans, esters, and lactones. Coordination of the arene substituent to the nickel catalyst accelerates the reactions. Arenes with low aromatic stabilization energies, such as naphthalene, benzothiophene, and furan, serve as the best ligands and provide the highest reactivity. Traceless directing groups that accelerate reactions of sluggish substrates are described, providing partial compensation for arene coordination. Kumada, Negishi, and Suzuki reactions provide incorporation of a broad range of transmetalating agents. In Kumada coupling reactions, a full complement of Grigard reagents, including methyl, n-alkyl, and aryl Grignard reagents, are employed. In reactions employing methylmagnesium iodide, ligation of the nickel catalyst by rac-BINAP or DPEphos provides the highest yield and stereospecificity. For all other Grignard reagents, Ni(dppe)Cl2 has emerged as the best catalyst. Negishi cross-coupling reactions employing dimethylzinc are reported as a strategy to increase the functional group tolerance of the reaction. We also describe Suzuki reactions using arylboronic esters. These reactions provided the first example in the series of a switch in stereochemical outcome. The reactions maintain stereospecificity, but reactions employing different achiral ligands provide opposite enantiomers of the product. Use of an N-heterocyclic carbene ligand, SIMes, provides inversion, consistent with our prior work in Kumada and Negishi coupling reactions. Use of the electron-rich phosphine PCy3, however, provides retention with stereospecificity, signaling a change in the mechanistic details. Potential applications of the reported cross-coupling reactions include the synthesis of medicinal agents containing the 2-arylalkane and 1,1-diarylalkane moieties, which are pharmacophores in medicinal chemistry. These moieties are found in compounds with activity against a broad range of indications, including cancer, heart disease, diabetes, osteoporosis, smallpox, tuberculosis, and insomnia. We highlight representative examples of bioactive compounds that we have prepared with high enantioselectivity employing our methods, as well as the discovery of a new anti-cancer agent.
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Affiliation(s)
- Emily J. Tollefson
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Luke E. Hanna
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Elizabeth R. Jarvo
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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65
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Shih JL, Nguyen TS, May JA. Organocatalyzed Asymmetric Conjugate Addition of Heteroaryl and Aryl Trifluoroborates: a Synthetic Strategy for Discoipyrrole D. Angew Chem Int Ed Engl 2015; 54:9931-5. [PMID: 26074014 DOI: 10.1002/anie.201503528] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Indexed: 11/09/2022]
Abstract
Bis-heteroaryl or bis-aryl stereocenters were formed by an organocatalytic enantioselective conjugate addition using the respective trifluoroborate salts as nucleophiles. Control studies suggested that fluoride dissociation is necessary in the anhydrous conditions. This strategy is applicable to the synthesis of discoipyrrole D, an inhibitor of BR5 fibroblast migration.
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Affiliation(s)
- Jiun-Le Shih
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, TX 77204-5003 (USA)
| | - Thien S Nguyen
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, TX 77204-5003 (USA)
| | - Jeremy A May
- Department of Chemistry, University of Houston, 112 Fleming Building, Houston, TX 77204-5003 (USA).
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66
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Shih JL, Nguyen TS, May JA. Organocatalyzed Asymmetric Conjugate Addition of Heteroaryl and Aryl Trifluoroborates: a Synthetic Strategy for Discoipyrrole D. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503528] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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67
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Dai W, Lu H, Jiang XL, Gao TT, Shi F. Organocatalytic asymmetric hydroarylation of o-hydroxyl styrenes via remote activation of phenylhydrazones. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2014.12.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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68
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Cao ZC, Yu DG, Zhu RY, Wei JB, Shi ZJ. Direct cross-coupling of benzyl alcohols to construct diarylmethanes via palladium catalysis. Chem Commun (Camb) 2015; 51:2683-6. [DOI: 10.1039/c4cc10084k] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A direct arylation to furnish diarylmethanes from benzyl alcohols was realized through Pd(PPh3)4-catalyzed Suzuki–Miyaura coupling via benzylic C–O activation in the absence of any additives. The arylation is compatible with various functional groups. This development provides an atom- and step-economic way to approach a diarylmethane scaffold under mild and environmentally benign conditions.
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Affiliation(s)
- Zhi-Chao Cao
- Beijing National Laboratory of Molecule Science (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry and Green Chemistry Center
- Peking University
- Beijing
- China
| | - Da-Gang Yu
- Beijing National Laboratory of Molecule Science (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry and Green Chemistry Center
- Peking University
- Beijing
- China
| | - Ru-Yi Zhu
- Beijing National Laboratory of Molecule Science (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry and Green Chemistry Center
- Peking University
- Beijing
- China
| | - Jiang-Bo Wei
- Beijing National Laboratory of Molecule Science (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry and Green Chemistry Center
- Peking University
- Beijing
- China
| | - Zhang-Jie Shi
- Beijing National Laboratory of Molecule Science (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education
- College of Chemistry and Green Chemistry Center
- Peking University
- Beijing
- China
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69
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Wang Z, Ai F, Wang Z, Zhao W, Zhu G, Lin Z, Sun J. Organocatalytic Asymmetric Synthesis of 1,1-Diarylethanes by Transfer Hydrogenation. J Am Chem Soc 2014; 137:383-9. [DOI: 10.1021/ja510980d] [Citation(s) in RCA: 231] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Zhaobin Wang
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Fujin Ai
- Department
of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong SAR, China
| | - Zheng Wang
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Wanxiang Zhao
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Guangyu Zhu
- Department
of Biology and Chemistry, City University of Hong Kong, Kowloon Tong, Hong Kong SAR, China
| | - Zhenyang Lin
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Jianwei Sun
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
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70
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A General, Simple Catalyst for Enantiospecific Cross Couplings of Benzylic Ammonium Triflates and Boronic Acids: No Phosphine Ligand Required. Tetrahedron 2014; 70:4257-4263. [PMID: 25364060 DOI: 10.1016/j.tet.2014.03.039] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Highly improved conditions for the enantiospecific cross coupling of benzylic ammonium triflates with boronic acids are reported. This method relies on the use of Ni(cod)2 without ancillary phosphine or N-heterocyclic carbene ligands as catalyst. These conditions enable the coupling of new classes of boronic acids and benzylic ammonium triflates. In particular, both heteroaromatic and vinyl boronic acids are well tolerated as coupling partners. In addition, these conditions enable the use of ammonium triflates with a variety of substituents at the benzylic stereocenter. Further, naphthyl-substitution is not required on the benzylic ammonium triflate; ammonium triflates with simple aromatic substituents also undergo this coupling. Good to high yields and levels of stereochemical fidelity are observed. This new catalyst system greatly expands the utility of enantiospecific cross couplings of these amine-derived substrates for the preparation of highly enantioenriched products.
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71
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Fischer M, Coleman RG, Fraser JS, Shoichet BK. Incorporation of protein flexibility and conformational energy penalties in docking screens to improve ligand discovery. Nat Chem 2014; 6:575-83. [PMID: 24950326 PMCID: PMC4144196 DOI: 10.1038/nchem.1954] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 04/11/2014] [Indexed: 12/04/2022]
Abstract
Proteins fluctuate between alternative conformations, which presents a challenge for ligand discovery because such flexibility is difficult to treat computationally owing to problems with conformational sampling and energy weighting. Here we describe a flexible docking method that samples and weights protein conformations using experimentally derived conformations as a guide. The crystallographically refined occupancies of these conformations, which are observable in an apo receptor structure, define energy penalties for docking. In a large prospective library screen, we identified new ligands that target specific receptor conformations of a cavity in cytochrome c peroxidase, and we confirm both ligand pose and associated receptor conformation predictions by crystallography. The inclusion of receptor flexibility led to ligands with new chemotypes and physical properties. By exploiting experimental measures of loop and side-chain flexibility, this method can be extended to the discovery of new ligands for hundreds of targets in the Protein Data Bank for which similar experimental information is available.
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Affiliation(s)
- Marcus Fischer
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158
- Faculty of Pharmacy, Donnelly Center, University of Toronto, 160 College St. Toronto Ontario M5S 3E1
| | - Ryan G. Coleman
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158
| | - James S. Fraser
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA 94158
| | - Brian K. Shoichet
- Department of Pharmaceutical Chemistry, University of California San Francisco, San Francisco, CA 94158
- Faculty of Pharmacy, Donnelly Center, University of Toronto, 160 College St. Toronto Ontario M5S 3E1
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72
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Nallagonda R, Rehan M, Ghorai P. Chemoselective C-Benzylation of Unprotected Anilines with Benzyl Alcohols Using Re2O7 Catalyst. J Org Chem 2014; 79:2934-43. [DOI: 10.1021/jo4028598] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Rajender Nallagonda
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Indore
By-pass Road, Bhauri, Bhopal-462066, India
| | - Mohammad Rehan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Indore
By-pass Road, Bhauri, Bhopal-462066, India
| | - Prasanta Ghorai
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Indore
By-pass Road, Bhauri, Bhopal-462066, India
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73
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Carboni A, Dagousset G, Magnier E, Masson G. One pot and selective intermolecular aryl- and heteroaryl-trifluoromethylation of alkenes by photoredox catalysis. Chem Commun (Camb) 2014; 50:14197-200. [DOI: 10.1039/c4cc07066f] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A general and efficient photoredox-catalyzed intermolecular aryl- and heteroaryltrifluoromethylation of styrenes with Umemoto's reagent has been developed.
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Affiliation(s)
- Aude Carboni
- Centre de Recherche de Gif
- Institut de Chimie des Substances Naturelles
- CNRS
- 91198 Gif-sur-Yvette Cedex, France
| | - Guillaume Dagousset
- Centre de Recherche de Gif
- Institut de Chimie des Substances Naturelles
- CNRS
- 91198 Gif-sur-Yvette Cedex, France
| | - Emmanuel Magnier
- Institut Lavoisier de Versailles
- UMR 8180
- Université de Versailles-Saint-Quentin
- 78035 Versailles Cedex, France
| | - Géraldine Masson
- Centre de Recherche de Gif
- Institut de Chimie des Substances Naturelles
- CNRS
- 91198 Gif-sur-Yvette Cedex, France
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74
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Mondal S, Panda G. Synthetic methodologies of achiral diarylmethanols, diaryl and triarylmethanes (TRAMs) and medicinal properties of diaryl and triarylmethanes-an overview. RSC Adv 2014. [DOI: 10.1039/c4ra01341g] [Citation(s) in RCA: 184] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
This review covers the synthesis of achiral diarylmethanols, diaryl and triarylmethanes and the bioactivities of diaryl and triarylmethanes during 1995 to 2013.
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Affiliation(s)
- Sankalan Mondal
- Central Drug Research Institute
- Medicinal and Process Chemistry Division
- Lucknow, India
| | - Gautam Panda
- Central Drug Research Institute
- Medicinal and Process Chemistry Division
- Lucknow, India
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75
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Dong J, Lee PS, Yoshikai N. Cobalt-catalyzed Branched-selective Addition of Aromatic Ketimines to Styrenes under Room-temperature Conditions. CHEM LETT 2013. [DOI: 10.1246/cl.130508] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jinghua Dong
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University
| | - Pin-Sheng Lee
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University
| | - Naohiko Yoshikai
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University
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76
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Saini V, Liao L, Wang Q, Jana R, Sigman MS. Pd(0)-catalyzed 1,1-diarylation of ethylene and allylic carbonates. Org Lett 2013; 15:5008-11. [PMID: 24047468 DOI: 10.1021/ol4023358] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient protocol for the one-step synthesis of biologically relevant 1,1-diarylalkanes has been described. This reaction introduces two different aryl groups across the terminal end of simple feedstock alkenes such as ethylene and allylic carbonates. The propensity to generate π-benzylpalladium intermediates dictates the exclusive 1,1-regioselectivity observed in the product.
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Affiliation(s)
- Vaneet Saini
- Department of Chemistry, University of Utah , 315 South 1400 East, Salt Lake City, Utah 84112, United States
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77
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Wang X, Liu LH, Shi JH, Peng J, Tu HY, Zhang AD. Facile One-Pot Palladium-Catalyzed Sequential Coupling to Diarylmethanes by Using Aryl Methyl Ketones as the Methylene Donors. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300594] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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78
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Swift EC, Jarvo ER. Asymmetric transition metal-catalyzed cross-coupling reactions for the construction of tertiary stereocenters. Tetrahedron 2013; 69:5799-5817. [PMID: 23956470 DOI: 10.1016/j.tet.2013.05.001] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Elizabeth C Swift
- Department of Chemistry, University of California, Irvine, California 92697-2025
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79
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Wu L, Grigoryan AV, Li Y, Hao B, Pagano M, Cardozo TJ. Specific small molecule inhibitors of Skp2-mediated p27 degradation. ACTA ACUST UNITED AC 2013; 19:1515-24. [PMID: 23261596 DOI: 10.1016/j.chembiol.2012.09.015] [Citation(s) in RCA: 177] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 09/17/2012] [Accepted: 09/24/2012] [Indexed: 10/27/2022]
Abstract
In the ubiquitin proteasome system, the E3 ligase SCF-Skp2 and its accessory protein, Cks1, promote proliferation largely by inducing the degradation of the CDK inhibitor p27. Overexpression of Skp2 in human cancers correlates with poor prognosis, and deregulation of SCF-Skp2-Cks1 promotes tumorigenesis in animal models. We identified small molecule inhibitors specific to SCF-Skp2 activity using in silico screens targeted to the binding interface for p27. These compounds selectively inhibited Skp2-mediated p27 degradation by reducing p27 binding through key compound-receptor contacts. In cancer cells, the compounds induced p27 accumulation in a Skp2-dependent manner and promoted cell-type-specific blocks in the G1 or G2/M phases. Designing SCF-Skp2-specific inhibitors may be a novel strategy to treat cancers dependent on the Skp2-p27 axis.
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Affiliation(s)
- Lily Wu
- Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, NY 10016, USA
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80
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González J, González J, Pérez-Calleja C, López LA, Vicente R. Zinc-Catalyzed Synthesis of Functionalized Furans and Triarylmethanes from Enynones and Alcohols or Azoles: Dual XH Bond Activation by Zinc. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301625] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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81
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González J, González J, Pérez-Calleja C, López LA, Vicente R. Zinc-Catalyzed Synthesis of Functionalized Furans and Triarylmethanes from Enynones and Alcohols or Azoles: Dual XH Bond Activation by Zinc. Angew Chem Int Ed Engl 2013; 52:5853-7. [DOI: 10.1002/anie.201301625] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Indexed: 01/17/2023]
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82
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Zhou Q, Srinivas HD, Dasgupta S, Watson MP. Nickel-catalyzed cross-couplings of benzylic pivalates with arylboroxines: stereospecific formation of diarylalkanes and triarylmethanes. J Am Chem Soc 2013; 135:3307-10. [PMID: 23425080 PMCID: PMC4218864 DOI: 10.1021/ja312087x] [Citation(s) in RCA: 221] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We have developed a stereospecific nickel-catalyzed cross-coupling of benzylic pivalates with arylboroxines. The success of this reaction relies on the use of Ni(cod)2 as the catalyst and NaOMe as a uniquely effective base. This reaction has broad scope with respect to the arylboroxine and benzylic pivalate, enabling the synthesis of a variety of diarylalkanes and triarylmethanes in good to excellent yields and ee's.
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Affiliation(s)
- Qi Zhou
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716
| | - Harathi D. Srinivas
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716
| | - Srimoyee Dasgupta
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716
| | - Mary P. Watson
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716
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83
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Bess EN, Sigman MS. Distinctive Meta-Directing Group Effect for Iridium-Catalyzed 1,1-Diarylalkene Enantioselective Hydrogenation. Org Lett 2013; 15:646-9. [DOI: 10.1021/ol303465c] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Elizabeth N. Bess
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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84
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Maity P, Shacklady-McAtee DM, Yap GPA, Sirianni ER, Watson MP. Nickel-catalyzed cross couplings of benzylic ammonium salts and boronic acids: stereospecific formation of diarylethanes via C-N bond activation. J Am Chem Soc 2012; 135:280-5. [PMID: 23268734 DOI: 10.1021/ja3089422] [Citation(s) in RCA: 229] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We have developed a nickel-catalyzed cross coupling of benzylic ammonium triflates with aryl boronic acids to afford diarylmethanes and diarylethanes. This reaction proceeds under mild reaction conditions and with exceptional functional group tolerance. Further, it transforms branched benzylic ammonium salts to diarylethanes with excellent chirality transfer, offering a new strategy for the synthesis of highly enantioenriched diarylethanes from readily available chiral benzylic amines.
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Affiliation(s)
- Prantik Maity
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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85
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Lee PS, Yoshikai N. Aldimine-directed branched-selective hydroarylation of styrenes. Angew Chem Int Ed Engl 2012; 52:1240-4. [PMID: 23225756 DOI: 10.1002/anie.201207958] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Indexed: 11/09/2022]
Affiliation(s)
- Pin-Sheng Lee
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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86
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Lee PS, Yoshikai N. Aldimine-Directed Branched-Selective Hydroarylation of Styrenes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201207958] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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87
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Kotwal GJ, Hatch S, Marshall WL. Viral infection: an evolving insight into the signal transduction pathways responsible for the innate immune response. Adv Virol 2012; 2012:131457. [PMID: 22997518 PMCID: PMC3446651 DOI: 10.1155/2012/131457] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 06/21/2012] [Indexed: 12/31/2022] Open
Abstract
The innate immune response is initiated by the interaction of stereotypical pathogen components with genetically conserved receptors for extracytosolic pathogen-associated molecular patterns (PAMPs) or intracytosolic nucleic acids. In multicellular organisms, this interaction typically clusters signal transduction molecules and leads to their activations, thereby initiating signals that activate innate immune effector mechanisms to protect the host. In some cases programmed cell death-a fundamental form of innate immunity-is initiated in response to genotoxic or biochemical stress that is associated with viral infection. In this paper we will summarize innate immune mechanisms that are relevant to viral pathogenesis and outline the continuing evolution of viral mechanisms that suppress the innate immunity in mammalian hosts. These mechanisms of viral innate immune evasion provide significant insight into the pathways of the antiviral innate immune response of many organisms. Examples of relevant mammalian innate immune defenses host defenses include signaling to interferon and cytokine response pathways as well as signaling to the inflammasome. Understanding which viral innate immune evasion mechanisms are linked to pathogenesis may translate into therapies and vaccines that are truly effective in eliminating the morbidity and mortality associated with viral infections in individuals.
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Affiliation(s)
- Girish J. Kotwal
- University of Medicine and Health Sciences, St. Kitts, New York, NY 10001, USA
| | - Steven Hatch
- Division of Infectious Disease and Immunology, Department of Medicine, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA
| | - William L. Marshall
- Division of Infectious Disease and Immunology, Department of Medicine, University of Massachusetts Medical School, 364 Plantation Street, Worcester, MA 01605, USA
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88
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Guiteras Capdevila M, Emer E, Benfatti F, Gualandi A, Wilson CM, Cozzi PG. Indium(III)-Promoted Organocatalytic Enantioselective α-Alkylation of Aldehydes with Benzylic and Benzhydrylic Alcohols. ASIAN J ORG CHEM 2012. [DOI: 10.1002/ajoc.201200013] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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89
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Greene MA, Yonova IM, Williams FJ, Jarvo ER. Traceless directing group for stereospecific nickel-catalyzed alkyl-alkyl cross-coupling reactions. Org Lett 2012; 14:4293-6. [PMID: 22568515 DOI: 10.1021/ol300891k] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Stereospecific nickel-catalyzed cross-coupling reactions of benzylic 2-methoxyethyl ethers are reported for the preparation of enantioenriched 1,1-diarylethanes. The 2-methoxyethyl ether serves as a traceless directing group that accelerates cross-coupling. Chelation of magnesium ions is proposed to activate the benzylic C-O bond for oxidative addition.
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Affiliation(s)
- Margaret A Greene
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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90
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Müller KH, Kakkola L, Nagaraj AS, Cheltsov AV, Anastasina M, Kainov DE. Emerging cellular targets for influenza antiviral agents. Trends Pharmacol Sci 2012; 33:89-99. [DOI: 10.1016/j.tips.2011.10.004] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 10/12/2011] [Accepted: 10/14/2011] [Indexed: 01/23/2023]
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91
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Postigo A, Way M. The vaccinia virus-encoded Bcl-2 homologues do not act as direct Bax inhibitors. J Virol 2012; 86:203-13. [PMID: 22013032 PMCID: PMC3255923 DOI: 10.1128/jvi.05817-11] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Accepted: 10/12/2011] [Indexed: 11/20/2022] Open
Abstract
Many viruses, including members of several poxvirus genera, encode inhibitors that block apoptosis by simultaneously binding the proapoptotic Bcl-2 proteins Bak and Bax. The Orthopoxvirus vaccinia virus encodes the Bcl-2-like F1 protein, which sequesters Bak but not Bax. However, N1, a potent virulence factor, is reported to be antiapoptotic and to interact with Bax. Here we investigated whether vaccinia virus inhibits Bak/Bax-dependent apoptosis via the cooperative action of F1 and N1. We found that Western Reserve (WR) and ΔN1L viruses inhibited drug- and infection-induced apoptosis equally. Meanwhile, infections with ΔF1L or ΔN1L/F1L virus resulted in similar levels of Bax activation and apoptosis. Outside the context of infection, N1 did not block drug- or Bax-induced cell death or interact with Bax. In addition to F1 and N1, vaccinia virus encodes further structural homologs of Bcl-2 proteins that are conserved in orthopoxviruses, including A46, A52, B14, C1, C6, C16/B22, K7, and N2. However, we found that these do not associate with Bax or inhibit drug-induced cell death. Based on our findings that N1 is not an antiapoptotic protein, we propose that the F1 orthologs represent the only orthopoxvirus Bcl-2 homolog to directly inhibit the Bak/Bax checkpoint.
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Affiliation(s)
- Antonio Postigo
- Cancer Research UK London Research Institute, London, United Kingdom
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92
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Abstract
Viruses are the most abundant and diverse pathogens challenging the host immune system, and as such are a severe threat to human health. To this end, viruses have evolved multiple strategies to evade and subvert the host immune response. Host-pathogen interactions are usually initiated via recognition of pathogen-associated molecular patterns (PAMPs) by host sensors known as pattern recognition receptors (PRRs), which include, Toll-like receptors (TLRs), RIG-I-like receptors (RLRs), NOD-like receptors (NLRs) and DNA receptors. Effective sensing of PAMPs rapidly triggers host immune responses, via activation of complex signalling pathways that culminates in the induction of inflammatory responses and the eradication of pathogens. Activation of the nuclear factor-κB (NF-κB) transcription pathway is crucial for the immediate early step of immune activation. This review discusses the recent evidence describing a variety of viral effectors that have been shown to prevent NF-κB signalling. Most of these viral effectors can be broadly classified into three categories based on the site of inhibition within the NF-κB pathway, that is, at the (i) TLRs, (ii) IKK complex or (iii) the transcriptional level.
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Affiliation(s)
- Gaëlle Le Negrate
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich Heine University, Düsseldorf, Germany.
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93
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Galindo I, Hernáez B, Berná J, Fenoll J, Cenis JL, Escribano JM, Alonso C. Comparative inhibitory activity of the stilbenes resveratrol and oxyresveratrol on African swine fever virus replication. Antiviral Res 2011; 91:57-63. [PMID: 21557969 DOI: 10.1016/j.antiviral.2011.04.013] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 04/08/2011] [Accepted: 04/26/2011] [Indexed: 12/18/2022]
Abstract
Stilbenols are polyphenolic phytoalexins produced by plants in response to biotic or abiotic stress. These compounds have received much attention because of their significant biological effects. One of these is their antiviral action, which has previously been documented for two members of this class, namely resveratrol and oxyresveratrol. Here we tested the antiviral effect of these two compounds on African swine fever virus, the only member of the newly created family Asfarviridae and a serious limitation to porcine production worldwide. Our results show a potent, dose-dependent antiviral effect of resveratrol and oxyresveratrol in vitro. Interestingly, this antiviral activity was found for these synthetic compounds and also for oxyresveratrol extracted from new natural sources (mulberry twigs). The antiviral effect of these two drugs was demonstrated at concentrations that do not induce cytotoxicity in cultured cells. Moreover, these antivirals achieved a 98-100% reduction in viral titers. Both compounds allowed early protein synthesis but inhibited viral DNA replication, late viral protein synthesis and viral factory formation.
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Affiliation(s)
- I Galindo
- Dpt. Biotecnología, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, INIA, Madrid, Spain
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94
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Taylor BLH, Swift EC, Waetzig JD, Jarvo ER. Stereospecific nickel-catalyzed cross-coupling reactions of alkyl ethers: enantioselective synthesis of diarylethanes. J Am Chem Soc 2010; 133:389-91. [PMID: 21155567 DOI: 10.1021/ja108547u] [Citation(s) in RCA: 178] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Secondary benzylic ethers undergo stereospecific substitution reactions with Grignard reagents in the presence of nickel catalysts. Reactions proceed with inversion of configuration and high stereochemical fidelity. This reaction allows for facile enantioselective synthesis of biologically active diarylethanes from readily available optically enriched carbinols.
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Affiliation(s)
- Buck L H Taylor
- Natural Sciences I 4114, Department of Chemistry, University of California, Irvine, Irvine, California, USA
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