1
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Bonfield H, Edge CM, Reid M, Kennedy AR, Pascoe DD, Lindsay DM, Valette D. Synthesis of 2,6- trans-Tetrahydropyrans Using a Palladium-Catalyzed Oxidative Heck Redox-Relay Strategy. Org Lett 2024; 26:2857-2861. [PMID: 38198695 PMCID: PMC11020158 DOI: 10.1021/acs.orglett.3c03866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 01/03/2024] [Accepted: 01/05/2024] [Indexed: 01/12/2024]
Abstract
The C-aryl-tetrahydropyran motif is prevalent in nature in a number of natural products with biological activity; however, this challenging architecture still requires novel synthetic approaches. We demonstrate the application of a stereoselective Heck redox-relay strategy for the synthesis of functionalized 2,6-trans-tetrahydropyrans in excellent selectivity in a single step from an enantiopure dihydropyranyl alcohol, proceeding through a novel exo-cyclic migration. The strategy has also been applied to the total synthesis of a trans-epimer of the natural product centrolobine in excellent yield and stereoselectivity.
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Affiliation(s)
- Holly
E. Bonfield
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, U.K.
- Drug
Substance Development, GSK, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
| | - Colin M. Edge
- Drug
Substance Development, GSK, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
| | - Marc Reid
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, U.K.
| | - Alan R. Kennedy
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, U.K.
| | - David D. Pascoe
- Drug
Substance Development, GSK, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
| | - David M. Lindsay
- Department
of Pure and Applied Chemistry, University
of Strathclyde, Glasgow G1 1XL, U.K.
| | - Damien Valette
- Drug
Substance Development, GSK, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K.
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2
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Fernandes RA, Jangid D, Gorve DA. Unanticipated Bicyclic Etherification in Luche Reduction: Asymmetric Total Syntheses of Diospongins A and B and Tetraketide. Org Lett 2024. [PMID: 38190121 DOI: 10.1021/acs.orglett.3c03313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
In the synthesis of diospongin B based on rearrangement of δ-hydroxyalkynone to 2,3-dihydro-4H-pyran-4-one, we discovered an unanticipated beguiling reaction giving a thermodynamically less stable 4-hydroxy-2,6-trans-disubstituted-THP moiety via bicyclic etherification under Luche reduction conditions and simple acid hydrolysis. The practical applicability of this method is exemplified by the asymmetric total syntheses of diospongins A and B, several analogues, and tetraketide.
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Affiliation(s)
- Rodney A Fernandes
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Dashrath Jangid
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Dnyaneshwar A Gorve
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
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3
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Saini D, Jangid D, Fernandes RA. Asymmetric total synthesis of diosniponols A and B. Org Biomol Chem 2023; 21:6524-6530. [PMID: 37523207 DOI: 10.1039/d3ob00863k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
A concise asymmetric total synthesis of diosniponols A and B has been achieved based on an enantioselective Jacobsen kinetic resolution of racemic epoxide and the important 2,3-dihydro-4H-pyran-4-one moiety being installed by the metal-free δ-hydroxyalkynone rearrangement catalyzed by p-TsOH. A diastereoselective catalytic hydrogenation set the required all-syn stereochemistry leading to diosniponol A, which then, under the Mitsunobu inversion conditions, provided diosniponol B. The structure and absolute stereochemistry of the natural products were further confirmed.
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Affiliation(s)
- Deepak Saini
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India.
| | - Dashrath Jangid
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India.
| | - Rodney A Fernandes
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India.
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4
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Soydan M, Okyar B, Zorlu Y, Marion A, Özçubukçu S. Tetraphenyl-1,4-dioxin and Tetraphenyl-pyrane-4-one: Old Molecules, New Insights. ACS OMEGA 2023; 8:19656-19662. [PMID: 37305285 PMCID: PMC10249104 DOI: 10.1021/acsomega.3c01226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 05/10/2023] [Indexed: 06/13/2023]
Abstract
Aggregation-induced emission (AIE) is a phenomenon where certain molecules or materials become highly luminescent when they aggregate or come together in a condensed state, such as a solid or a solution. Moreover, new molecules which show AIE properties are designed and synthesized for various applications like imaging, sensing, and optoelectronics. 2,3,5,6-Tetraphenylpyrazine (TPP) is one of the well-established examples of AIE. Herein, 2,3,5,6-tetraphenyl-1,4-dioxin (TPD) and 2,3,4,5-tetraphenyl-4H-pyran-4-one (TPPO), which are old molecules with TPP similarity, were studied, and new insights in terms of structure and aggregation-caused quenching (ACQ)/AIE properties were gained by means of theoretical calculations. Those calculations performed on TPD and TPPO aimed to provide a better understanding of their molecular structures and how they affect their luminescence properties. This information could be used to design new materials with improved AIE properties or to modify existing materials to overcome ACQ.
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Affiliation(s)
- Medine Soydan
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | - Burcu Okyar
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | - Yunus Zorlu
- Department
of Chemistry, Gebze Technical University, 41400 Kocaeli, Turkey
| | - Antoine Marion
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
| | - Salih Özçubukçu
- Department
of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
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5
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Chahal S, Rani P, Kiran, Sindhu J, Joshi G, Ganesan A, Kalyaanamoorthy S, Mayank, Kumar P, Singh R, Negi A. Design and Development of COX-II Inhibitors: Current Scenario and Future Perspective. ACS OMEGA 2023; 8:17446-17498. [PMID: 37251190 PMCID: PMC10210234 DOI: 10.1021/acsomega.3c00692] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 04/21/2023] [Indexed: 09/29/2023]
Abstract
Innate inflammation beyond a threshold is a significant problem involved in cardiovascular diseases, cancer, and many other chronic conditions. Cyclooxygenase (COX) enzymes are key inflammatory markers as they catalyze prostaglandins production and are crucial for inflammation processes. While COX-I is constitutively expressed and is generally involved in "housekeeping" roles, the expression of the COX-II isoform is induced by the stimulation of different inflammatory cytokines and also promotes the further generation of pro-inflammatory cytokines and chemokines, which affect the prognosis of various diseases. Hence, COX-II is considered an important therapeutic target for drug development against inflammation-related illnesses. Several selective COX-II inhibitors with safe gastric safety profiles features that do not cause gastrointestinal complications associated with classic anti-inflammatory drugs have been developed. Nevertheless, there is mounting evidence of cardiovascular side effects from COX-II inhibitors that resulted in the withdrawal of market-approved anti-COX-II drugs. This necessitates the development of COX-II inhibitors that not only exhibit inhibit potency but also are free of side effects. Probing the scaffold diversity of known inhibitors is vital to achieving this goal. A systematic review and discussion on the scaffold diversity of COX inhibitors are still limited. To address this gap, herein we present an overview of chemical structures and inhibitory activity of different scaffolds of known COX-II inhibitors. The insights from this article could be helpful in seeding the development of next-generation COX-II inhibitors.
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Affiliation(s)
- Sandhya Chahal
- Department
of Chemistry, COBS&H, CCS Haryana Agricultural
University, Hisar 125004, India
| | - Payal Rani
- Department
of Chemistry, COBS&H, CCS Haryana Agricultural
University, Hisar 125004, India
| | - Kiran
- Department
of Chemistry, COBS&H, CCS Haryana Agricultural
University, Hisar 125004, India
| | - Jayant Sindhu
- Department
of Chemistry, COBS&H, CCS Haryana Agricultural
University, Hisar 125004, India
| | - Gaurav Joshi
- Department
of Pharmaceutical Sciences, Hemvati Nandan
Bahuguna Garhwal (A Central) University, Chauras Campus, Tehri Garhwal, Uttarakhand 249161, India
- Adjunct
Faculty at Department of Biotechnology, Graphic Era (Deemed to be) University, 566/6, Bell Road, Clement Town, Dehradun, Uttarakhand 248002, India
| | - Aravindhan Ganesan
- ArGan’sLab,
School of Pharmacy, University of Waterloo, Waterloo, Ontario N2G 1C5, Canada
| | | | - Mayank
- University
College of Pharmacy, Guru Kashi University, Talwandi Sabo, Punjab 151302, India
| | - Parvin Kumar
- Department
of Chemistry, Kurukshetra University, Kurukshetra 136119, India
| | - Rajvir Singh
- Department
of Chemistry, COBS&H, CCS Haryana Agricultural
University, Hisar 125004, India
| | - Arvind Negi
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo 02150, Finland
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6
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Catalytic δ-hydroxyalkynone rearrangement in the stereoselective total synthesis of centrolobine, engelheptanoxides A and C and analogues. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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Vahedpour T, Kaur J, Hemmati S, Hamzeh-Mivehroud M, Alizadeh AA, Wuest F, Dastmalchi S. Synthesis and Biological Evaluation of 1,3,5-Trisubstituted 2-Pyrazolines as Novel Cyclooxygenase-2 Inhibitors with Antiproliferative Activity. Chem Biodivers 2021; 18:e2000832. [PMID: 33620122 DOI: 10.1002/cbdv.202000832] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 02/01/2021] [Indexed: 01/22/2023]
Abstract
A new series of 1,3,5-trisubstituted 2-pyrazolines for the inhibition of cyclooxygenase-2 (COX-2) were synthesized. The designed structures include a COX-2 pharmacophore SO2 CH3 at the para-position of the phenyl ring located at C-5 of a pyrazoline scaffold. The synthesized compounds were tested for in vitro COX-1/COX-2 inhibition and cell toxicity against human colorectal adenocarcinoma cell lines HT-29. The lead compound (4-chlorophenyl){5-[4-(methanesulfonyl)phenyl]-3-phenyl-4,5-dihydro-1H-pyrazol-1-yl}methanone (16) showed significant COX-2 inhibition (IC50 =0.05±0.01 μM), and antiproliferative activity (IC50 =5.46±4.71 μM). Molecular docking studies showed that new pyrazoline-based compounds interact via multiple hydrophobic and hydrogen-bond interactions with key binding site residues of the COX-2 enzyme.
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Affiliation(s)
- Teymour Vahedpour
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran.,Department of Medicinal Chemistry, School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran
| | - Jatinder Kaur
- Department of Oncology, University of Alberta, Edmonton, AB, T6G 1Z2, Canada.,Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, T6G 2H7, Canada
| | - Salar Hemmati
- Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran
| | - Maryam Hamzeh-Mivehroud
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran.,Department of Medicinal Chemistry, School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran
| | - Ali Akbar Alizadeh
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran.,Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran
| | - Frank Wuest
- Department of Oncology, University of Alberta, Edmonton, AB, T6G 1Z2, Canada.,Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB, T6G 2H7, Canada.,Department of Chemistry, University of Alberta, Edmonton, AB, T6G 2G2, Canada
| | - Siavoush Dastmalchi
- Biotechnology Research Center, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran.,Department of Medicinal Chemistry, School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, 5165665811, Iran.,Faculty of Pharmacy, Near East University, Po.Box: 99138, Mersin 10, Nicosia, North Cyprus, Turkey
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8
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Yan F, Zhou L, Han B, Zhang Y, Li B, Wang L, Zhu L. Zeolite Immobilized Copper Catalyzed Conjugate Borylation of α, β-Unsaturated Compounds in Aqueous Media. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202011017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Fernandes RA, Saini D. Asymmetric Synthesis of Catechol Pyran Isolated from
Plectranthus sylvestris
by δ‐Hydroxyalkynone Rearrangement. ChemistrySelect 2020. [DOI: 10.1002/slct.202003986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Rodney A. Fernandes
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra India
| | - Deepak Saini
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra India
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10
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Wei W, Liao L, Qin T, Zhao X. Access to Saturated Thiocyano-Containing Azaheterocycles via Selenide-Catalyzed Regio- and Stereoselective Thiocyanoaminocyclization of Alkenes. Org Lett 2019; 21:7846-7850. [DOI: 10.1021/acs.orglett.9b02834] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wei Wei
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P.R. China
| | - Lihao Liao
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P.R. China
| | - Tian Qin
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P.R. China
| | - Xiaodan Zhao
- Institute of Organic Chemistry & MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P.R. China
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11
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Gava R, Fernández E. Selective C−C Coupling of Vinyl Epoxides with Diborylmethide Lithium Salts. Chemistry 2019; 25:8013-8017. [DOI: 10.1002/chem.201901406] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Riccardo Gava
- Department Química Física i InorgànicaUniversity Rovira i Virgili Tarragona Spain
| | - Elena Fernández
- Department Química Física i InorgànicaUniversity Rovira i Virgili Tarragona Spain
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12
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Tietz O, Kaur J, Bhardwaj A, Wuest FR. Pyrimidine-based fluorescent COX-2 inhibitors: synthesis and biological evaluation. Org Biomol Chem 2018; 14:7250-7. [PMID: 27383140 DOI: 10.1039/c6ob00493h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The cyclooxygenase-2 (COX-2) enzyme is overexpressed in a variety of cancers and mediates inflammatory processes that aid the growth and progression of malignancies. Three novel and selective fluorescent COX-2 inhibitors have been designed and synthesized on the basis of previously reported pyrimidine-based COX-2 inhibitors and the 7-nitrobenzofurazan fluorophore. In vitro evaluation of COX-1/COX-2 isozyme inhibition identified N-(2-((7-nitro-benzo[c][1,2,5]oxadiazol-4-yl)amino)propyl)-4-[4-(methylsulfonyl)phenyl]-6-(trifluoro-methyl)-pyrimidin-2-amine (6) as a novel potent and selective COX-2 inhibitor (IC50 = 1.8 μM). Lead compound (6) was further evaluated for its ability to selectively visualize COX-2 isozyme in COX-2 expressing human colon cancer cell line HCA-7 using confocal microscopy experiments.
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Affiliation(s)
- Ole Tietz
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, T6G 1Z2, Edmonton, AB, Canada.
| | - Jatinder Kaur
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, T6G 1Z2, Edmonton, AB, Canada. and Department of Pharmacy and Pharmaceutical Sciences, Medical Sciences Building, University of Alberta, T6G 2H1, Edmonton, AB, Canada
| | - Atul Bhardwaj
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, T6G 1Z2, Edmonton, AB, Canada. and Department of Pharmacy and Pharmaceutical Sciences, Medical Sciences Building, University of Alberta, T6G 2H1, Edmonton, AB, Canada
| | - Frank R Wuest
- Department of Oncology, Cross Cancer Institute, University of Alberta, 11560 University Avenue, T6G 1Z2, Edmonton, AB, Canada. and Department of Pharmacy and Pharmaceutical Sciences, Medical Sciences Building, University of Alberta, T6G 2H1, Edmonton, AB, Canada
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13
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Boev VI, Moskalenko AI, Belopukhov SL. Stereoselective synthesis of tri- and tetrasubstituted tetrahydropyrans from syn- and anti-1-R-2-(4-bromophenyl)-5-methylhex-4-en-1-ols and some chemical transformations of the products. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1070428017070144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Nocquet PA, Corbu A, Meerpoel L, Stansfield I, Berthelot D, Angibaud P, Cossy J. Diastereoselective Synthesis of trans
-2,3-Diaryl(heteroaryl)-3,6-dihydropyrans by an Allylboration/Ring-Closing-Metathesis Sequence. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700448] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Pierre-Antoine Nocquet
- Laboratoire de Chimie Organique; Institute of Chemistry; Biology and Innovation (CBI); ESPCI Paris; PSL Research University, CNRS; 10 rue Vauquelin 75231 Paris France
| | - Andrei Corbu
- Laboratoire de Chimie Organique; Institute of Chemistry; Biology and Innovation (CBI); ESPCI Paris; PSL Research University, CNRS; 10 rue Vauquelin 75231 Paris France
| | - Lieven Meerpoel
- Janssen Research & Development; Division of Janssen Pharmaceutica NV; Turnhoutseweg 30 2340 Beerse Belgium
| | - Ian Stansfield
- Janssen Research & Development; Division of Janssen-Cilag S.A.; Oncology and Medicinal Chemistry; Campus de Maigremont 27106 Val de Reuil CEDEX France
| | - Didier Berthelot
- Janssen Research & Development; Division of Janssen-Cilag S.A.; Oncology and Medicinal Chemistry; Campus de Maigremont 27106 Val de Reuil CEDEX France
| | - Patrick Angibaud
- Janssen Research & Development; Division of Janssen-Cilag S.A.; Oncology and Medicinal Chemistry; Campus de Maigremont 27106 Val de Reuil CEDEX France
| | - Janine Cossy
- Laboratoire de Chimie Organique; Institute of Chemistry; Biology and Innovation (CBI); ESPCI Paris; PSL Research University, CNRS; 10 rue Vauquelin 75231 Paris France
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15
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereoselective synthesis of 2-aryl-4-en-1-ols, promising synthons for the preparation of oxygen heterocycles. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1070428017020051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Li X, Zhang L, Xiao YH, Guo QP, Da CS, Li H, Liu X, Ma X, Ma Y. Direct asymmetric aldol reaction of acetophenones with aromatic aldehydes catalyzed by chiral Al/Zn heterobimetallic compounds. RUSS J GEN CHEM+ 2016. [DOI: 10.1134/s1070363216080247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereodirected reactions of salicilaldehyde derivatives with tert-butyl 3(4)-hydroxy-2(3)-(3-methylbut-2-enyl)- piperidine-1-carboxylates as an efficient preparation procedure of tetrahydropyran derivatives fused with a piperidine ring. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2016. [DOI: 10.1134/s1070428016080108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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18
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Silva FPL, Dantas BB, Faheina Martins GV, de Araújo DAM, Vasconcellos MLADA. Synthesis and Anticancer Activities of Novel Guanylhydrazone and Aminoguanidine Tetrahydropyran Derivatives. Molecules 2016; 21:molecules21060671. [PMID: 27338323 PMCID: PMC6274535 DOI: 10.3390/molecules21060671] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 05/05/2016] [Accepted: 05/11/2016] [Indexed: 11/16/2022] Open
Abstract
In this paper we present the convenient syntheses of six new guanylhydrazone and aminoguanidine tetrahydropyran derivatives 2-7. The guanylhydrazone 2, 3 and 4 were prepared in 100% yield, starting from corresponding aromatic ketones 8a-c and aminoguanidine hydrochloride accessed by microwave irradiation. The aminoguanidine 5, 6 and 7 were prepared by reduction of guanylhydrazone 2-4 with sodium cyanoborohydride (94% yield of 5, and 100% yield of 6 and 7). The aromatic ketones 8a-c were prepared from the Barbier reaction followed by the Prins cyclization reaction (two steps, 63%-65% and 95%-98%). Cytotoxicity studies have demonstrated the effects of compounds 2-7 in various cancer and normal cell lines. That way, we showed that these compounds decreased cell viabilities in a micromolar range, and from all the compounds tested we can state that, at least, compound 3 can be considered a promising molecule for target-directed drug design.
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Affiliation(s)
- Fábio Pedrosa Lins Silva
- Departamento de Química, Campus I, Laboratório de Síntese Orgânica Medicinal da Paraíba (LASOM-PB), Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Bruna Braga Dantas
- Departamento de Biotecnologia, Campus I, Laboratório de Biotecnologia Celular e Molecular, Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Gláucia Veríssimo Faheina Martins
- Departamento de Biotecnologia, Campus I, Laboratório de Biotecnologia Celular e Molecular, Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Demétrius Antônio Machado de Araújo
- Departamento de Biotecnologia, Campus I, Laboratório de Biotecnologia Celular e Molecular, Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
| | - Mário Luiz Araújo de Almeida Vasconcellos
- Departamento de Química, Campus I, Laboratório de Síntese Orgânica Medicinal da Paraíba (LASOM-PB), Universidade Federal da Paraíba, João Pessoa, CEP:58051-900, Paraíba, Brazil.
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19
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereoselective synthesis of tetrahydropyran new derivatives underlain by α-allyl ketones. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2016. [DOI: 10.1134/s1070428016050031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Chang MY, Cheng YC. Synthesis of Substituted Tetralins and Benzosuberans via BF3·OEt2-Mediated Formal (4 + 2) and (5 + 2) Stereocontrolled Cycloaddition of 4-Alkenols with Veratrol. Org Lett 2016; 18:608-11. [DOI: 10.1021/acs.orglett.5b03696] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meng-Yang Chang
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Yu-Chieh Cheng
- Department
of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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21
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Sultana S, Devi NR, Saikia AK. Synthesis of Substituted Tetrahydropyrans and Tetrahydrofurans via Intramolecular Hydroalkoxylation of Alkenols. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500314] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sabera Sultana
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
| | - Ngangbam Renubala Devi
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
| | - Anil K. Saikia
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
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22
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Kaur J, Tietz O, Bhardwaj A, Marshall A, Way J, Wuest M, Wuest F. Design, Synthesis, and Evaluation of an (18)F-Labeled Radiotracer Based on Celecoxib-NBD for Positron Emission Tomography (PET) Imaging of Cyclooxygenase-2 (COX-2). ChemMedChem 2015; 10:1635-40. [PMID: 26287271 DOI: 10.1002/cmdc.201500287] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Indexed: 12/18/2022]
Abstract
A series of novel fluorine-containing cyclooxygenase-2 (COX-2) inhibitors was designed and synthesized based on the previously reported fluorescent COX-2 imaging agent celecoxib-NBD (3; NBD=7-nitrobenzofurazan). In vitro COX-1/COX-2 inhibitory data show that N-(4-fluorobenzyl)-4-(5-p-tolyl-3-trifluoromethylpyrazol-1-yl)benzenesulfonamide (5; IC50 =0.36 μM, SI>277) and N-fluoromethyl-4-(5-p-tolyl-3-trifluoromethylpyrazol-1-yl)benzenesulfonamide (6; IC50 =0.24 μM, SI>416) are potent and selective COX-2 inhibitors. Compound 5 was selected for radiolabeling with the short-lived positron emitter fluorine-18 ((18) F) and evaluated as a positron emission tomography (PET) imaging agent. Radiotracer [(18) F]5 was analyzed in vitro and in vivo using human colorectal cancer model HCA-7. Although radiotracer uptake into COX-2-expressing HCA-7 cells was high, no evidence for COX-2-specific binding was found. Radiotracer uptake into HCA-7 tumors in vivo was low and similar to that of muscle, used as reference tissue.
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Affiliation(s)
- Jatinder Kaur
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada).,Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, AB, T6G 2E1 (Canada)
| | - Ole Tietz
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada)
| | - Atul Bhardwaj
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada).,Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, AB, T6G 2E1 (Canada)
| | - Alison Marshall
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada)
| | - Jenilee Way
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada)
| | - Melinda Wuest
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada)
| | - Frank Wuest
- Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, T6G 1Z2 (Canada). .,Faculty of Pharmacy & Pharmaceutical Sciences, University of Alberta, Edmonton, AB, T6G 2E1 (Canada).
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23
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Reddy BVS, Venkateswarlu A, Sridevi B, Marumudi K, Kunwar AC, Gayatri G. A novel Prins cascade process for the stereoselective synthesis of oxa-bicycles. Org Biomol Chem 2015; 13:2669-72. [PMID: 25582106 DOI: 10.1039/c4ob02347a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
E- and Z-9-Methyldeca-3,8-dien-1-ols undergo smooth cyclization with aldehydes in the presence of 20 mol% AgSbF6 under extremely mild conditions to generate the corresponding oxa-bicycles in good yields with excellent selectivity. In fact, E-olefin affords the trans-product exclusively, whereas the Z-olefin gives the cis-product predominantly. In the case of E- or Z-8-methylnona-3,8-dien-1-ol, the product is formed via the termination of Prins cyclization with an allylic C-H bond through olefin migration. The termination of Prins cyclization with tethered olefin is an unprecedented reaction, which provides a useful motif of various natural products.
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Affiliation(s)
- B V Subba Reddy
- Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, India.
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24
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Liu C, Cheng D, Yang F. An Efficient Prins Cyclization for Stereoselective Synthesis of Tetrahydropyran from Imines and Homoallyl Alcohols. CHINESE J CHEM 2014. [DOI: 10.1002/cjoc.201400450] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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In silico molecular modeling and prediction of activity of substituted tetrahydropyrans as COX-2 inhibitor. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1148-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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27
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Shaveta, Singh P. Structural optimization of indole based compounds for highly promising anti-cancer activities: Structure activity relationship studies and identification of lead molecules. Eur J Med Chem 2014; 74:440-50. [DOI: 10.1016/j.ejmech.2013.12.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 12/11/2013] [Accepted: 12/27/2013] [Indexed: 10/25/2022]
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28
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Ahmed N, Konduru NK, Ahmad S, Owais M. Synthesis of flavonoids based novel tetrahydropyran conjugates (Prins products) and their antiproliferative activity against human cancer cell lines. Eur J Med Chem 2014; 75:233-46. [DOI: 10.1016/j.ejmech.2014.01.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 01/11/2014] [Accepted: 01/18/2014] [Indexed: 10/25/2022]
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29
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Indrasena Reddy K, Aruna C, Sudhakar Babu K, Vijayakumar V, Manisha M, Padma Sridevi J, Yogeeswari P, Sriram D. General and efficient synthesis of benzoxazol-2(3H)-ones: evolution of their anti-cancer and anti-mycobacterial activities. RSC Adv 2014. [DOI: 10.1039/c4ra07123a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel class of benzo[d]oxazol-2(3H)-one derivatives has been synthesized and their in vitro cytotoxicity against human pancreatic adenocarcinoma and human non-small cell lung carcinoma cancer cell lines was evaluated.
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Affiliation(s)
- K. Indrasena Reddy
- Vector Biosciences Pvt. Ltd
- Hyderabad, India
- Department of Chemistry
- Sri Krishnadevaraya University
- Anantapur, India
| | - C. Aruna
- Department of Chemistry
- Sri Krishnadevaraya University
- Anantapur, India
| | | | - V. Vijayakumar
- Centre for Organic and Medicinal Chemistry
- VIT University
- Vellore, India
| | - M. Manisha
- DBT-HTS
- Piramal Entreprises Limited
- Mumbai, India
| | - J. Padma Sridevi
- Birla Institute of Technology & Science, Pilani
- Hyderabad Campus, India
| | - P. Yogeeswari
- Birla Institute of Technology & Science, Pilani
- Hyderabad Campus, India
| | - D. Sriram
- Birla Institute of Technology & Science, Pilani
- Hyderabad Campus, India
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30
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Bhardwaj A, Kaur J, Wuest F, Knaus EE. Fluorophore-labeled cyclooxygenase-2 inhibitors for the imaging of cyclooxygenase-2 overexpression in cancer: synthesis and biological studies. ChemMedChem 2013; 9:109-16, 240. [PMID: 24376205 DOI: 10.1002/cmdc.201300355] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 10/08/2013] [Indexed: 01/26/2023]
Abstract
A group of cyclooxygenase-2 (COX-2)-specific fluorescent cancer biomarkers were synthesized by linking the anti-inflammatory drugs ibuprofen, (S)-naproxen, and celecoxib to the 7-nitrobenzofurazan (NBD) fluorophore. In vitro COX-1/COX-2 inhibition studies indicated that all of these fluorescent conjugates are COX-2 inhibitors (IC₅₀ range: 0.19-23.0 μM) with an appreciable COX-2 selectivity index (SI≥4.3-444). In this study the celecoxib-NBD conjugate N-(2-((7-nitrobenzo[c][1,2,5]oxadiazol-4-yl)amino)ethyl)-4-(5-(p-tolyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)benzenesulfonamide, which displayed the highest COX-2 inhibitory potency and selectivity (COX-2 IC₅₀ =0.19 μM; SI=443.6), was identified as an impending COX-2-specific biomarker for the fluorescence imaging of cancer using a COX-2-expressing human colon cancer cell line (HCA-7).
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Affiliation(s)
- Atul Bhardwaj
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, T6G 2E1 (Canada); Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, Alberta, T6G 1Z2 (Canada)
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31
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Molander GA, Wisniewski SR, Hosseini-Sarvari M. Synthesis and Suzuki-Miyaura Cross-Coupling of Enantioenriched Secondary Potassium β-Trifluoroboratoamides: Catalytic, Asymmetric Conjugate Addition of Bisboronic Acid and Tetrakis(dimethylamino)diboron to α, β-Unsaturated Carbonyl Compounds. Adv Synth Catal 2013; 355:3037-3057. [PMID: 24741373 DOI: 10.1002/adsc.201300640] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Enantioenriched potassium β-trifluoroboratoamides have been synthesized via an asymmetric, copper-catalyzed 1,4-addition of tetrahydroxydiboron (BBA) and tetrakis(dimethylamino)diboron to α,β-unsaturated amides. These dibora reagents provide access to the desired organotrifluoroborates using effective and atom economical sources of boron. The copper-catalyzed β-boration is extended to α,β-unsaturated ketones and esters. Desired potassium organotrifluoroborates are synthesized with yields up to 92% and enantiomeric ratios up to 98:2. The enantioenriched potassium β-trifluoroboratoamides are successfully cross-coupled with an array of aryl and heteroaryl chlorides in high yield with complete stereochemical fidelity as the transmetalation proceeds through an SE2 mechanism via an open transition state.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104-6323
| | - Steven R Wisniewski
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104-6323
| | - Mona Hosseini-Sarvari
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104-6323
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32
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Dwivedi A, Srivastava AK, Singh A. Molecular modeling of pyridine derivatives for COX-2 inhibitors: quantitative structure–activity relationship study. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0691-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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33
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Production of hydroxlated flavonoids with cytochrome P450 BM3 variant F87V and their antioxidative activities. Biosci Biotechnol Biochem 2013; 77:1340-3. [PMID: 23748780 DOI: 10.1271/bbb.130148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A variant of P450 BM3 with an F87V substitution [P450 BM3 (F87V)] is a substrate-promiscuous cytochrome P450 monooxygenase. We investigated the bioconversion of various flavonoids (favanones, chalcone, and isoflavone) by using recombinant Escherichia coli cells, which expressed the gene coding for P450 BM3 (F87V), to give their corresponding hydroxylated products. Potent antioxidative activities were observed in some of the products.
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34
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Ghosh AK, Kass J, Nicponski DR, Keyes C. Diastereoselective Synthesis of Substituted Tetrahydropyrans by Copper(II)-Bisphosphine-Catalyzed Olefin Migration and Prins Cyclization. SYNTHESIS-STUTTGART 2012; 44:3579-3589. [PMID: 30449905 DOI: 10.1055/s-0032-1317495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We developed a copper(II) triflate-bisphosphine complex catalyzed olefin migration and Prins cyclization which lead to the synthesis of substituted tetrahydropyran derivatives. The protocol is convenient and a variety of substituted tetrahydropyrans were obtained in good to excellent yields with excellent diastereoselectivities.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Jorden Kass
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Daniel R Nicponski
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Chad Keyes
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
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35
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Zheng K, Liu X, Qin S, Xie M, Lin L, Hu C, Feng X. Completely OH-Selective FeCl3-Catalyzed Prins Cyclization: Highly Stereoselective Synthesis of 4-OH-Tetrahydropyrans. J Am Chem Soc 2012; 134:17564-73. [DOI: 10.1021/ja3062002] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ke Zheng
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Song Qin
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Mingsheng Xie
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Lili Lin
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Changwei Hu
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
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36
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Ghosh AK, Nicponski DR, Kass J. A Tandem Olefin Migration and Prins Cyclization Using Cu(OTf)(2)-Bisphosphine Complexes: An Improved Synthesis of Functionalized Tetrahydropyrans. Tetrahedron Lett 2012; 53:3699-3702. [PMID: 22753996 DOI: 10.1016/j.tetlet.2012.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In situ-generated (bis-DPPMB)-Cu(OTf)(2) complex has been examined to catalyze a tandem olefin migration and Prins cyclization of an alkenol with various aldehydes. The reaction proceeded with electron-rich aromatic aldehydes at room temperature and provided functionalized tetrahydropyrans in good yields. An efficient synthesis of the bis-DPPMB ligand has also been described.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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37
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38
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Saha P, Bhunia A, Saikia AK. Synthesis of 2,3,5,6-tetrasubstituted tetrahydropyrans via (3,5)-oxonium-ene reaction. Org Biomol Chem 2012; 10:2470-81. [DOI: 10.1039/c2ob06832j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Bartlett SL, Beaudry CM. High-yielding oxidation of β-hydroxyketones to β-diketones using o-iodoxybenzoic acid. J Org Chem 2011; 76:9852-5. [PMID: 22023037 DOI: 10.1021/jo201810c] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxidation of β-hydroxyketones to β-diketones was systematically investigated. o-Iodoxybenzoic acid (IBX) was found to be efficient, operationally easy, and superior to other common oxidants. The reaction is suitable for milligram- to gram-scale oxidations.
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Affiliation(s)
- Samuel L Bartlett
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, Oregon 97331, USA
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40
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Ghosh AK, Nicponski DR. Cu(II)-catalyzed olefin migration and Prins cyclization: highly diastereoselective synthesis of substituted tetrahydropyrans. Org Lett 2011; 13:4328-31. [PMID: 21797234 DOI: 10.1021/ol2016675] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Metal-ligand complexes of Cu(OTf)(2) with an appropriate bisphosphine ligand have been shown to effectively catalyze the formation of substituted tetrahydropyrans via a sequential olefin migration and Prins-type cyclization. This methodology provides convenient access to a variety of functionalized tetrahydropyrans in excellent diastereoselectivities and good to excellent yields.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, USA.
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Jawabrah Al-Hourani B, Sharma SK, Suresh M, Wuest F. Cyclooxygenase-2 inhibitors: a literature and patent review (2009 - 2010). Expert Opin Ther Pat 2011; 21:1339-432. [PMID: 21714592 DOI: 10.1517/13543776.2011.593510] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
INTRODUCTION COXs catalyze the complex conversion of arachidonic acid to prostaglandins and thromboxanes, which trigger as autacoids with autocrine and paracrine biological effects many physiological and pathophysiological responses. The structural similarities of the COX-1 and -2 enzymes make the search for selective inhibitors for COX-2 versus -1 a formidable challenge. AREAS COVERED The present review provides a survey of the development of novel COX-2 inhibitors covering literature and patents between 2009 and 2010. The presence of a central, typically 1,2-diaryl substituted, heterocycle or carbocycle as a characteristic structural motif in many selective COX-2 inhibitors represents the basis of their classification in this review. The classification in this review includes COX-2 inhibitors based on five- and six-membered heterocycles, benzoheterocycles (e.g., benzopyrans, benzopyranones, indoles and quinolines), quinones, chalcones, natural products and miscellaneous. When available, COX-2 inhibitors are presented with their related COX-2 inhibitory potency and selectivity. EXPERT OPINION The availability of detailed information on the crystal structure of the COX-2 enzyme with various substrates, cofactors and inhibitors, and the recently reported increased risk of cardiovascular events associated with selective COX-2 inhibitors will further stimulate development of COX-2 inhibitors with favorable COX-2 inhibition profiles without adverse effects to the cardiovascular system.
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42
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Current world literature. Curr Opin Support Palliat Care 2011; 5:174-83. [PMID: 21521986 DOI: 10.1097/spc.0b013e3283473351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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