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Bora SK, Shit S, Sahu AK, Saikia AK. Diastereoselective Synthesis of 2,6-Disubstituted Tetrahydropyranones via Prins Cyclization of 3-Bromobut-3-en-1-ols and Aldehydes. J Org Chem 2023. [PMID: 36811615 DOI: 10.1021/acs.joc.2c02715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Tetrahydropyranones are synthesized from 3-bromobut-3-en-1-ols and aldehydes in good yields with excellent diastereoselectivity at -35 °C. The reaction involves an initial formation of a most stable six-membered chairlike tetrahydropyranyl carbocation followed by nucleophilic attack of the hydroxyl group and subsequent elimination of HBr to give tetrahydropyranone. The carbonyl moiety of the tetrahydropyranone is converted to enol ether and esters using Wittig reaction. It is also transformed into 4-hydroxy-2,6-disubstituted tetrahydropyran with 2,4- and 4,6-cis configuration by lithium aluminum hydride in up to 96% diastereoselectivity. Furthermore, the methodology is extended toward the synthesis of novel anticancer aminoguanidine compounds.
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Affiliation(s)
- Surjya Kumar Bora
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Sudip Shit
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Archana Kumari Sahu
- 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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2
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Biradar DO, Mane YD, Reddy BS, Yadav J. Stereoselective total syntheses of dodoneine and its diastereomer, epidodoneine via Prins cyclisation. Tetrahedron 2023. [DOI: 10.1016/j.tet.2022.133242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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3
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Biradar DO, Mane YD, Narsaiah A, Subba Reddy B. First Diastereoselective Total Synthesis of Bicyclic Styryl Lactone: (1R,5R,7R)-7-((E)-styryl)-2,6-dioxabicyclo[3.3.1]nonan-3-one. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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4
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Pravardhan Reddy E, Padmaja P, Chandra Shekar P, Kamalaker Reddy K, Subba Reddy B. Benzyl chlorides as aldehyde surrogates in the Prins cyclization: Direct access to 2-aryl-4-chlorotetrahydropyrans. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153746] [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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5
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Patra SA, Das Pattanayak P, Mohapatra D, Dinda R. Recent Advancement on Decarbonylation Reactions Assisted by Ru-complexes: Synthetic and Mechanistic Approach. Dalton Trans 2022; 51:8571-8582. [DOI: 10.1039/d2dt00241h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This frontier article covers the recent advancements in the ruthenium complex catalysed decarbonylation reactions of different types of carbonyl compounds and provides a direction towards the mechanistic understanding involved in...
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Chen L, Mo F, Cheng H, Qi Z. Brønsted Acidic Deep Eutectic Solvent Based on Imidazole and p-Toluenesulfonic Acid Intensified Prins Condensation of Styrene with Formaldehyde. CHEM LETT 2021. [DOI: 10.1246/cl.200877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Lifang Chen
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Fan Mo
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Hongye Cheng
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Zhiwen Qi
- Max Planck Partner Group at the State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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7
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Budakoti A, Mondal PK, Verma P, Khamrai J. Prins cyclization-mediated stereoselective synthesis of tetrahydropyrans and dihydropyrans: an inspection of twenty years. Beilstein J Org Chem 2021; 17:932-963. [PMID: 33981366 PMCID: PMC8093554 DOI: 10.3762/bjoc.17.77] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 04/14/2021] [Indexed: 11/25/2022] Open
Abstract
Functionalized tetrahydropyran (THP) rings are important building blocks and ubiquitous scaffolds in many natural products and active pharmaceutical ingredients (API). Among various established methods, the Prins reaction has emerged as a powerful technique in the stereoselective synthesis of the tetrahydropyran skeleton with various substituents, and the strategy has further been successfully applied in the total synthesis of bioactive macrocycles and related natural products. In this context, hundreds of valuable contributions have already been made in this area, and the present review is intended to provide the systematic assortment of diverse Prins cyclization strategies, covering the literature reports of the last twenty years (from 2000 to 2019), with an aim to give an overview on exciting advancements in this area and designing new strategies for the total synthesis of related natural products.
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Affiliation(s)
- Asha Budakoti
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Pradip Kumar Mondal
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Prachi Verma
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Jagadish Khamrai
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
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8
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Floreancig PE. Perrhenate Esters as Intermediates in Molecular Complexity-Increasing Reactions. Synlett 2021. [DOI: 10.1055/a-1377-0346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
AbstractAllylic alcohols form perrhenate esters upon reaction with Re2O7 or HOReO3. These species undergo nonstereospecific and nonregiospecific alcohol-transposition reactions through cationic intermediates. Sequencing these nonselective processes with reversible trapping by electrophiles results in cyclization reactions where regio- and stereocontrol are dictated by thermodynamics. The cationic intermediates can also be utilized as electrophiles in intra- or intermolecular dehydrative reactions with nucleophiles. These processes serve as the basis for applications in catalytic syntheses of a wide range of heterocyclic and carbocyclic structures that often show considerable increases in molecular complexity. This Account describes a sequence of events that started from a need to solve a problem for the completion of a natural product synthesis and evolved into a central element in the design of numerous new transformations that proceed under mild conditions from readily accessible substrates.1 Introduction2 Exploratory Studies3 Application to Spiroketal Synthesis4 Reactions with Epoxides as Trapping Agents5 Development of Dehydrative Cyclizations6 Bimolecular Reactions7 Spirocyclic Ether Formation8 Conclusions
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Padmaja P, Reddy PN, Subba Reddy BV. Tandem Prins cyclizations for the construction of oxygen containing heterocycles. Org Biomol Chem 2020; 18:7514-7532. [PMID: 32940271 DOI: 10.1039/d0ob00960a] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tandem Prins cyclization is a versatile method for the synthesis of fused/bridged/spirotetrahydropyran scaffolds. Therefore, it has become a powerful tool for the stereoselective synthesis of oxygen/nitrogen containing heterocycles. Indeed, previous review articles on Prins spirocyclization illustrate the synthesis of spirotetrahydropyran derivatives and the aza-Prins reaction demonstrates its application in the total synthesis of natural products. The current review is devoted specifically to highlight tandem Prins cyclizations for the construction of fused scaffolds and related frameworks with a particular emphasis on recent applications. The mechanistic aspects and the scope of the methods are briefly discussed herein.
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Affiliation(s)
- P Padmaja
- Fluoro & Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, India.
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Heravi MM, Zadsirjan V, Daraie M, Ghanbarian M. Applications of Wittig Reaction in the Total Synthesis of Natural Macrolides. ChemistrySelect 2020. [DOI: 10.1002/slct.202002192] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Majid M. Heravi
- Department of Chemistry, School of ScienceAlzahra University, Vanak, Tehran Iran
| | - Vahideh Zadsirjan
- Department of Chemistry, School of ScienceAlzahra University, Vanak, Tehran Iran
| | - Mansoureh Daraie
- Department of Chemistry, School of ScienceAlzahra University, Vanak, Tehran Iran
| | - Manizheh Ghanbarian
- Department of Chemistry, School of ScienceAlzahra University, Vanak, Tehran Iran
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Enantioselective syntheses of (E)-γ,δ-disubstituted homoallylic alcohols via BF3·OEt2-catalyzed aldehyde allylboration and analysis of the origin of E-selectivity: A1,2 allylic strain vs. syn-pentane interaction. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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12
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Donnelly BL, Elliott LD, Willis CL, Booker‐Milburn KI. Sequential Photochemical and Prins Reactions for the Diastereoselective Synthesis of Tricyclic Scaffolds. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bethan L. Donnelly
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Luke D. Elliott
- School of ChemistryUniversity of Bristol Cantock's Close Bristol BS8 1TS UK
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Donnelly BL, Elliott LD, Willis CL, Booker-Milburn KI. Sequential Photochemical and Prins Reactions for the Diastereoselective Synthesis of Tricyclic Scaffolds. Angew Chem Int Ed Engl 2019; 58:9095-9098. [PMID: 31032547 DOI: 10.1002/anie.201903488] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Indexed: 11/06/2022]
Abstract
Cyclobutene alcohols undergo Prins cyclisations to generate single diastereomers of novel tricyclic heterocycles with five contiguous stereocentres. The reaction times are significantly shorter (ca. 15 min) than with traditional alkene substrates. Stereoselective aza-Prins cyclisations of cyclobutene amine derivatives give fused aza-heterocyclic scaffolds. Computational studies provide insight into the observed stereocontrol. The modular approach is flexible, enabling the introduction of a variety of functional groups (including amides, nitriles, alkynes, and arenes) into the sp3 -rich heterocyclic scaffolds.
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Affiliation(s)
- Bethan L Donnelly
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Luke D Elliott
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Christine L Willis
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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Henry JL, Wilson MR, Mulligan MP, Quinn TR, Sackett DL, Taylor RE. Synthesis, conformational preferences, and biological activity of conformational analogues of the microtubule-stabilizing agents, (-)-zampanolide and (-)-dactylolide. MEDCHEMCOMM 2019; 10:800-805. [PMID: 31191870 PMCID: PMC6540953 DOI: 10.1039/c9md00164f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 04/08/2019] [Indexed: 01/07/2023]
Abstract
Zampanolide and dactylolide are microtubule-stabilizing polyketides possessing potent cytotoxicity towards a variety of cancer cell lines. Using our understanding of the conformational preferences of the macrolide core in both natural products, we hypothesized that analogues lacking the C17-methyl group would maintain the necessary conformation for bioactivity while reducing the number of synthetic manipulations necessary for their synthesis. Analogues 3, 4 and 5 were prepared via total synthesis, and their conformational preferences were determined through computational and high-field NMR studies. While no observable activities were present in dactylolide analogues 3 and 4, zampanolide analogue 5 exhibited sub-micromolar cytotoxicity. Herein, we describe these efforts towards understanding the structure- and conformation-activity relationships of dactylolide and zampanolide.
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Affiliation(s)
- Jeffrey L Henry
- The Warren Family Research Center for Drug Discovery and Development and the Department of Chemistry & Biochemistry , University of Notre Dame , Notre Dame , IN 46556-5670 , USA .
| | - Matthew R Wilson
- Vertex Pharmaceuticals , 50 Northern Ave , Boston , MA 02210 , USA
| | - Michael P Mulligan
- The Warren Family Research Center for Drug Discovery and Development and the Department of Chemistry & Biochemistry , University of Notre Dame , Notre Dame , IN 46556-5670 , USA .
| | - Taylor R Quinn
- The Warren Family Research Center for Drug Discovery and Development and the Department of Chemistry & Biochemistry , University of Notre Dame , Notre Dame , IN 46556-5670 , USA .
| | - Dan L Sackett
- Eunice Kennedy Shriver National Institute of Child Health and Human Development , National Institutes of Health , Bethesda , MD 20892 , USA
| | - Richard E Taylor
- The Warren Family Research Center for Drug Discovery and Development and the Department of Chemistry & Biochemistry , University of Notre Dame , Notre Dame , IN 46556-5670 , USA .
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15
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Chandrashekhar R, Sridhar B, Reddy BVS. Substrate‐Controlled Aza‐Ene/Prins Cyclization for the Synthesis of Dihydroquinoline and Oxocene Derivatives. ChemistrySelect 2019. [DOI: 10.1002/slct.201900095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Rapelli Chandrashekhar
- Fluoro & AgrochemicalsLaboratory of X-ray CrystallographyCSIR-Indian Institute of Chemical Technology Hyderabad –500 007 India
- Academy of Scientific and Innovative Research New Delhi 110025
| | - Balasubramanian Sridhar
- Fluoro & AgrochemicalsLaboratory of X-ray CrystallographyCSIR-Indian Institute of Chemical Technology Hyderabad –500 007 India
| | - Basi V. Subba Reddy
- Fluoro & AgrochemicalsLaboratory of X-ray CrystallographyCSIR-Indian Institute of Chemical Technology Hyderabad –500 007 India
- Academy of Scientific and Innovative Research New Delhi 110025
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Cruz DA, Sinka V, Martín VS, Padrón JI. Iron-Catalyzed Prins-Peterson Reaction for the Direct Synthesis of Δ 4-2,7-Disubstituted Oxepenes. J Org Chem 2018; 83:12632-12647. [PMID: 30252471 DOI: 10.1021/acs.joc.8b01978] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A direct iron(III)-catalyzed Prins-Peterson reaction involving α-substituted γ-triphenylsilyl bis-homoallylic alcohols and aldehydes is described. Thus, cis-Δ4-2,7-disubstituted oxepenes were synthesized in a diastereoselective reaction using sustainable catalytic conditions (3-5 mol %). This highly productive process is the result of a cascade of three chemical events with the concomitant formation of a C-O bond, a C-C bond, and a Δ4 endocyclic double bond, through a Prins cyclization followed by a Peterson-type elimination. This tandem reaction is chemoselective vs the classical Prins cyclization.
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Affiliation(s)
- Daniel A Cruz
- Instituto Universitario de Bio-Orgánica "Antonio González" (CIBICAN), "Síntesis Orgánica Sostenible, Unidad Asociada al CSIC", Departamento de Química Orgánica , Universidad de La Laguna , C/Francisco Sánchez 2 , San Cristóbal de La Laguna , Santa Cruz de Tenerife 38206 , Spain
| | - Victoria Sinka
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) , Avda. Astrofísico Francisco Sánchez 3 , San Cristóbal de La Laguna , Santa Cruz de Tenerife 38206 , Spain
| | - Víctor S Martín
- Instituto Universitario de Bio-Orgánica "Antonio González" (CIBICAN), "Síntesis Orgánica Sostenible, Unidad Asociada al CSIC", Departamento de Química Orgánica , Universidad de La Laguna , C/Francisco Sánchez 2 , San Cristóbal de La Laguna , Santa Cruz de Tenerife 38206 , Spain
| | - Juan I Padrón
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC) , Avda. Astrofísico Francisco Sánchez 3 , San Cristóbal de La Laguna , Santa Cruz de Tenerife 38206 , Spain.,Instituto Universitario de Bio-Orgánica "Antonio González" (CIBICAN), "Síntesis Orgánica Sostenible, Unidad Asociada al CSIC", Departamento de Química Orgánica , Universidad de La Laguna , C/Francisco Sánchez 2 , San Cristóbal de La Laguna , Santa Cruz de Tenerife 38206 , Spain
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Chen G, Wang R, Vue B, Patanapongpibul M, Zhang Q, Zheng S, Wang G, White JD, Chen QH. Optimized synthesis and antiproliferative activity of desTHPdactylolides. Bioorg Med Chem 2018; 26:3514-3520. [PMID: 29784275 PMCID: PMC6008235 DOI: 10.1016/j.bmc.2018.05.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/12/2018] [Accepted: 05/17/2018] [Indexed: 11/16/2022]
Abstract
Dactylolide and certain analogues are attractive targets for study due to their structural resemblance to zampanolide, a very promising anticancer lead compound and a unique covalent-binding microtubule stabilizing agent. The primary goal of this project is identification and synthesis of simplified analogues of dactylolide that would be easier to prepare and could be investigated for antiproliferative activity in comparison with zampanolide. Extension of Almann's concept of a simplified zampanolide analogue to dactylolide in the form of desTHPdactylolide was attractive not only for reasons of synthetic simplification but also for the prospect that analogues of dactylolide could be prepared in both (17S) and (17R) configurations. Since Altmann's overall yield for the six-step procedure leading to the C9-C18 fragment of desTHPdactylolide was only 8.7%, a study focused on optimized synthesis and antiproliferative evaluation of each enantiomer of desTHPdactylolide was initiated using Altmann's route as a framework. To this end, two optimized approaches to this fragment C9-C18 were successfully developed by us using allyl iodide or allyl tosylate as the starting material for a critical Williamson ether synthesis. Both (17S) and (17R) desTHPdactylolides were readily synthesized in our laboratory using optimized methods in yields of 37-43%. Antiproliferative activity of the pair of enantiomeric desTHPdactylolides, together with their analogues, was evaluated in three docetaxel-sensitive and two docetaxel-resistant prostate cancer cell models using a WST-1 cell proliferation assay. Surprisingly, (17R) desTHPdactylolide was identified as the eutomer in the prostate cancer cell models. It was found that (17S) and (17R) desTHPdactylolide exhibit equivalent antiproliferative potency towards both docetaxel-sensitive (PC-3 and DU145) and docetaxel-resistant prostate cancer cell lines (PC-3/DTX and DU145/DTX).
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Affiliation(s)
- Guanglin Chen
- Department of Chemistry, California State University, Fresno, 2555 E. San Ramon Ave. M/S SB70, Fresno, CA 93740, USA
| | - Rubing Wang
- Department of Chemistry, California State University, Fresno, 2555 E. San Ramon Ave. M/S SB70, Fresno, CA 93740, USA
| | - Bao Vue
- Department of Chemistry, California State University, Fresno, 2555 E. San Ramon Ave. M/S SB70, Fresno, CA 93740, USA
| | - Manee Patanapongpibul
- Department of Chemistry, California State University, Fresno, 2555 E. San Ramon Ave. M/S SB70, Fresno, CA 93740, USA
| | - Qiang Zhang
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125, USA; RCMI Cancer Research Center, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125, USA
| | - Shilong Zheng
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125, USA; RCMI Cancer Research Center, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125, USA
| | - Guangdi Wang
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125, USA; RCMI Cancer Research Center, Xavier University of Louisiana, 1 Drexel Drive, New Orleans, LA 70125, USA
| | - James D White
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR 97331, USA
| | - Qiao-Hong Chen
- Department of Chemistry, California State University, Fresno, 2555 E. San Ramon Ave. M/S SB70, Fresno, CA 93740, USA.
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Kämmler L, Maier ME. Total Synthesis of Biselyngbyolide B and Its C21–C22 Z-Isomer. J Org Chem 2018; 83:4554-4567. [DOI: 10.1021/acs.joc.8b00298] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lena Kämmler
- Institut für Organische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Martin E. Maier
- Institut für Organische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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Chithiravel R, Rajaguru K, Muthusubramanian S, Bhuvanesh N. Characterization of the major isomers of substituted tetrahydro-2 H -pyrans from 1,3,5-triarylpentane-1,5-diols by p -toluenesulfonic acid treatment. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.12.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Li RQ, He Y, Ding Y, Ang CK, Tian JS, Loh TP. Formal synthesis of chelamidine alkaloids and their derivatives. Chem Commun (Camb) 2018. [DOI: 10.1039/c7cc09875h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A concise two-step operation of α-amination of aldehydes and subsequent Friedel–Crafts/Prins-type cyclization towards accessing tetrahydrobenzo[c]phenanthridine and related structures was developed. In addition, the effectiveness of this protocol was also demonstrated in the formal synthesis of homochelidonine and chelamidine.
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Affiliation(s)
- Rui-Qi Li
- Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering (SCME), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)
- Nanjing 211816
- P. R. China
| | - Yu He
- Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering (SCME), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)
- Nanjing 211816
- P. R. China
| | - Yao Ding
- Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering (SCME), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)
- Nanjing 211816
- P. R. China
| | - Chee-Kiat Ang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU)
- Singapore 637371
- Singapore
| | - Jie-Sheng Tian
- Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering (SCME), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)
- Nanjing 211816
- P. R. China
| | - Teck-Peng Loh
- Institute of Advanced Synthesis (IAS), School of Chemistry and Molecular Engineering (SCME), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech)
- Nanjing 211816
- P. R. China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU)
- Singapore 637371
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Mukherjee N, Pal S, Saha A, Ranu BC. Silver-catalyzed carbon–selenium cross-coupling using N-(phenylseleno)phthalimide: an alternate approach to the synthesis of organoselenides. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Silver(I) catalyzed phenylselenylation of terminal alkynes and organoboronic acids has been demonstrated using N-(phenylseleno)phthalimide as an electrophilic SePh donor. A wide variety of terminal alkynes and organoboronic acids are selenylated efficiently to produce the corresponding alkynyl and diaryl selenides, respectively, in good yields. Silver(I) acts as a Lewis acid in this process.
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Affiliation(s)
- Nirmalya Mukherjee
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Subhajit Pal
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Amit Saha
- Department of Chemistry, Achhruram Memorial College, Jhalda, Purulia 723202, West Bengal, India
| | - Brindaban C. Ranu
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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23
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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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24
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25
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Rambabu G, Palakshi Reddy B, Kiran YB, Vijayakumar V, Barbosa LCA. Simple and efficient synthesis of 4-arylamino-1,3-dioxanes in aqueous medium: a new route for the Prins reaction. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-014-1902-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Wang J, Ting SZY, Harvey JE. Preparation of conjugated dienoates with Bestmann ylide: Towards the synthesis of zampanolide and dactylolide using a facile linchpin approach. Beilstein J Org Chem 2015; 11:1815-22. [PMID: 26664601 PMCID: PMC4660958 DOI: 10.3762/bjoc.11.197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 09/07/2015] [Indexed: 01/21/2023] Open
Abstract
Bestmann ylide [(triphenylphosphoranylidene)ketene] acts as a chemical linchpin that links nucleophilic entities, such as alcohols or amines, with carbonyl moieties to produce unsaturated esters and amides, respectively. In this work, the formation of α,β,γ,δ-unsaturated esters (dienoates) is achieved through the coupling of Bestmann ylide, an alcohol and an α,β-unsaturated aldehyde. Primary and secondary alcohols, including allylic alcohols, are suitable substrates; the newly formed alkene has an E-geometry. Strategically, this represents a highly efficient route to unsaturated polyketide derivatives. A linchpin approach to the synthesis of a major fragment of the natural products zampanolide and dactylolide is investigated using Bestmann ylide to link the C16-C20 alcohol with the C3-C8 aldehyde fragment.
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Affiliation(s)
- Jingjing Wang
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Samuel Z Y Ting
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Joanne E Harvey
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
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27
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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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28
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Pérez SJ, Purino M, Miranda PO, Martín VS, Fernández I, Padrón JI. Prins Cyclization Catalyzed by a FeIII/Trimethylsilyl Halide System: The Oxocarbenium Ion Pathway versus the [2+2] Cycloaddition. Chemistry 2015; 21:15211-7. [PMID: 26471437 DOI: 10.1002/chem.201502488] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Sixto J Pérez
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Martín Purino
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Pedro O Miranda
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (CSIC), C/Francisco Sánchez 3, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922260135
| | - Víctor S Martín
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571.
| | - Israel Fernández
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid (Spain).
| | - Juan I Padrón
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571.
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (CSIC), C/Francisco Sánchez 3, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922260135.
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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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30
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Yadav J, Rahman MA, Reddy NM, Prasad A. Synthesis of spiroketal fragment of ossamycin via Prins cyclization. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Fu K, Zheng J, Lin L, Liu X, Feng X. Chiral N,N′-dioxide–In(OTf)3-catalyzed asymmetric vinylogous Mukaiyama aldol reactions. Chem Commun (Camb) 2015; 51:3106-8. [DOI: 10.1039/c4cc09820j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chiralN,N′-dioxide–In(OTf)3catalyst system has been successfully developed to catalyze the vinylogous Mukaiyama aldol reaction of silyl dienol ester with aldehydes. Furthermore, (R,E)-methyl 5-hydroxydec-2-enoate can be easily converted into (R)-δ-decalactone, (3R,5R)-valerolactone and (4R,6R,10R,12R)-verbalactone.
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Affiliation(s)
- Kai Fu
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Jianfeng Zheng
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology
- Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu 610064
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32
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Sarmah B, Baishya G, Baruah RK. Prins-Arylthiolation Reaction on Terpenoids: Diastereoselective Synthesis of 4-Arylthiooctahydro-2H-chromenes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Weidmann V, Ploog J, Kliewer S, Schaffrath M, Maison W. Variants of the Prins Cyclization for the Synthesis of Terpenoid Spiroethers and Oxabicyclo[3.3.1]Nonane Derivatives. J Org Chem 2014; 79:10123-31. [DOI: 10.1021/jo501755x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Verena Weidmann
- University of Hamburg, Department of Chemistry, Pharmaceutical and Medicinal
Chemistry, Bundesstrasse
45, 20146 Hamburg, Germany
| | - Jasper Ploog
- University of Hamburg, Department of Chemistry, Pharmaceutical and Medicinal
Chemistry, Bundesstrasse
45, 20146 Hamburg, Germany
| | - Serge Kliewer
- University of Hamburg, Department of Chemistry, Pharmaceutical and Medicinal
Chemistry, Bundesstrasse
45, 20146 Hamburg, Germany
| | - Mathias Schaffrath
- 2LGCR Chemistry, Sanofi-Aventis Deutschland GmbH, 65926 Frankfurt/Main, Germany
| | - Wolfgang Maison
- University of Hamburg, Department of Chemistry, Pharmaceutical and Medicinal
Chemistry, Bundesstrasse
45, 20146 Hamburg, Germany
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34
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Chen QH, Kingston DGI. Zampanolide and dactylolide: cytotoxic tubulin-assembly agents and promising anticancer leads. Nat Prod Rep 2014; 31:1202-26. [PMID: 24945566 PMCID: PMC4126874 DOI: 10.1039/c4np00024b] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Indexed: 12/21/2022]
Abstract
Zampanolide is a marine natural macrolide and a recent addition to the family of microtubule-stabilizing cytotoxic agents. Zampanolide exhibits unique effects on tubulin assembly and is more potent than paclitaxel against several multi-drug resistant cancer cell lines. A high-resolution crystal structure of αβ-tubulin in complex with zampanolide explains how taxane-site microtubule-stabilizing agents promote microtubule assemble and stability. This review provides an overview of current developments of zampanolide and its related but less potent analogue dactylolide, covering their natural sources and isolation, structure and conformation, cytotoxic potential, structure-activity studies, mechanism of action, and syntheses.
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Affiliation(s)
- Qiao-Hong Chen
- Department of Chemistry , California State University, Fresno , 2555 E. San Ramon Avenue, M/S SB70 , Fresno , CA 93740 , USA . ; Fax: +1 559 2784402 ; Tel: +1 559 2782394
| | - David G. I. Kingston
- Department of Chemistry and Virginia Tech Center for Drug Discovery , M/C 0212, Virginia Tech , Blacksburg , VA 24061 , USA . ; Fax: +1 540 2313255 ; Tel: +1 540 2316570
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35
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Yadav JS, Mallikarjuna Reddy N, Ataur Rahman M, Mallikarjuna Reddy A, Prasad AR. Stereoselective Total Synthesis of Botryolide E and Ophiocerin C. Helv Chim Acta 2014. [DOI: 10.1002/hlca.201300203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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36
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Kalkhambkar RG, Jeong YT. Highly Efficient Synthesis of 1,3-Dioxanes via Prins Reaction in Brønsted-Acidic Imidazolium Ionic Liquid. SYNTHETIC COMMUN 2014. [DOI: 10.1080/00397911.2013.823644] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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37
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Sarmah B, Baishya G, Baruah RK. First example of a Prins–Ritter reaction on terpenoids: a diastereoselective route to novel 4-amido-octahydro-2H-chromenes. RSC Adv 2014. [DOI: 10.1039/c4ra02124j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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38
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Kalesse M, Cordes M, Symkenberg G, Lu HH. The vinylogous Mukaiyama aldol reaction (VMAR) in natural product synthesis. Nat Prod Rep 2014; 31:563-94. [DOI: 10.1039/c3np70102f] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
This review will provide an overview on the recent developments of polyketide synthesis using the vinylogous Mukaiyama aldol reaction for the construction of advanced intermediates. In general, four different motifs can be constructed efficiently using the recent developments of asymmetric variants of this strategy.
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Affiliation(s)
- Markus Kalesse
- Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ)
- Leibniz Universität Hannover
- 30167 Hannover, Germany
- Helmholtz Centre for Infection Research (HZI)
- Braunschweig, Germany
| | - Martin Cordes
- Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ)
- Leibniz Universität Hannover
- 30167 Hannover, Germany
| | - Gerrit Symkenberg
- Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ)
- Leibniz Universität Hannover
- 30167 Hannover, Germany
| | - Hai-Hua Lu
- Institute for Organic Chemistry and Centre of Biomolecular Drug Research (BMWZ)
- Leibniz Universität Hannover
- 30167 Hannover, Germany
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39
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Asymmetric reduction of 2,2-dimethyl-6-(2-oxoalkyl/oxoaryl)-1,3-dioxin-4-ones and application to the synthesis of (+)-yashabushitriol. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.10.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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40
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Lombardo VM, Thomas CD, Scheidt KA. A Tandem Isomerization/Prins Strategy: Iridium(III)/Brønsted Acid Cooperative Catalysis. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201306462] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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41
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Lombardo VM, Thomas CD, Scheidt KA. A tandem isomerization/prins strategy: iridium(III)/Brønsted acid cooperative catalysis. Angew Chem Int Ed Engl 2013; 52:12910-4. [PMID: 24218144 DOI: 10.1002/anie.201306462] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Indexed: 02/03/2023]
Abstract
Working together: A mild and efficient isomerization/protonation sequence generates pyran-fused indoles by cooperative catalysis between cationic iridium(III) and Bi(OTf)3 . Three distinct cyclization manifolds lead to the corresponding bioactive scaffolds in good yields. In addition, N-substituted indoles can be synthesized enantioselectively in the presence of a chiral phosphate.
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Affiliation(s)
- Vince M Lombardo
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Chicago Tri-Institutional Center for Chemical Methods and Library Development (CT-CMLD), Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (USA)
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42
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Fatima Z, Rambabu G, Reddy BP, Vijayakumar V, Velmurugan D. N-(2-Fluorophenyl)-2,6-dimethyl-1,3-dioxan-4-amine. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1524. [PMID: 24098213 PMCID: PMC3790394 DOI: 10.1107/s1600536813024732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Accepted: 09/05/2013] [Indexed: 11/23/2022]
Abstract
In the title compound, C12H16FNO3, the dioxane ring adopts a chair conformation with the methyl groups and amine N atom in equatorial positions. The best plane through the dioxane ring makes a dihedral angle of 43.16 (8)° with the phenyl ring. In the crystal, pairs of C—H⋯O hydrogen bonds link the molecules into centrosymmetric R22(8) dimers, which are linked into [100] chains by further C—H⋯O hydrogen bonds. The N—H group does not participate in hydrogen bonding.
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43
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Fatima Z, Rambabu G, Reddy BP, Vijayakumar V, Velmurugan D. N-(4-Bromophenyl)-2,6-dimethyl-1,3-dioxan-4-amine. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1579. [PMID: 24098255 PMCID: PMC3790436 DOI: 10.1107/s1600536813025750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 09/17/2013] [Indexed: 11/16/2022]
Abstract
In the title compound, C12H16BrNO2, the dioxane ring adopts a chair conformation and its mean plane makes a dihedral angle of 60.63 (12)° with the 4-bromophenyl ring. In the crystal, molecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R22(8) ring motif. These dimers are consolidated by pairs of C—H⋯O hydrogen bonds with an R22(16) ring motif. Adjacent dimers are connected via C—H⋯O hydrogen bonds, forming infinite chains propagating along the c-axis direction.
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Fatima Z, Rambabu G, Reddy BP, Vijayakumar V, Velmurugan D. 2,6-Dimethyl- N-(2-methylphenyl)-1,3-dioxan-4-amine. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1561. [PMID: 24098241 PMCID: PMC3790422 DOI: 10.1107/s1600536813025294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 09/11/2013] [Indexed: 11/10/2022]
Abstract
In the title compound, C13H19NO2, the dioxane ring adopts a chair conformation and its mean plane makes a dihedral angle of 45.36 (8)° with the phenyl ring. In the crystal, molecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with R22(12) ring motifs. These dimers are consolidated by pairs of C—H⋯O hydrogen bonds with R22(8) ring motifs.
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45
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Fatima Z, Gottimukkal R, Reddy BP, Vijayakumar V, Velmurugan D. N-(4-Methoxyphenyl)-2,6-dimethyl-1,3-dioxan-4-amine. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1490. [PMID: 24427108 PMCID: PMC3884457 DOI: 10.1107/s1600536813023763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 08/22/2013] [Indexed: 11/10/2022]
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46
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Yu X, Sun D. Macrocyclic drugs and synthetic methodologies toward macrocycles. Molecules 2013; 18:6230-68. [PMID: 23708234 PMCID: PMC4374646 DOI: 10.3390/molecules18066230] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 05/15/2013] [Accepted: 05/20/2013] [Indexed: 01/02/2023] Open
Abstract
Macrocyclic scaffolds are commonly found in bioactive natural products and pharmaceutical molecules. So far, a large number of macrocyclic natural products have been isolated and synthesized. The construction of macrocycles is generally considered as a crucial and challenging step in the synthesis of macrocyclic natural products. Over the last several decades, numerous efforts have been undertaken toward the synthesis of complex naturally occurring macrocycles and great progresses have been made to advance the field of total synthesis. The commonly used synthetic methodologies toward macrocyclization include macrolactonization, macrolactamization, transition metal-catalyzed cross coupling, ring-closing metathesis, and click reaction, among others. Selected recent examples of macrocyclic synthesis of natural products and druglike macrocycles with significant biological relevance are highlighted in each class. The primary goal of this review is to summarize currently used macrocyclic drugs, highlight the therapeutic potential of this underexplored drug class and outline the general synthetic methodologies for the synthesis of macrocycles.
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Affiliation(s)
| | - Dianqing Sun
- Department of Pharmaceutical Sciences, The Daniel K. Inouye College of Pharmacy, University of Hawai’i at Hilo, 34 Rainbow Drive, Hilo, HI 96720, USA; E-Mail:
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47
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Eftekhari-Sis B, Zirak M, Akbari A. Arylglyoxals in Synthesis of Heterocyclic Compounds. Chem Rev 2013; 113:2958-3043. [DOI: 10.1021/cr300176g] [Citation(s) in RCA: 228] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Bagher Eftekhari-Sis
- Department of Chemistry, Faculty
of Science, University of Maragheh, Golshahr,
P.O. Box. 55181-83111, Maragheh, Iran
| | - Maryam Zirak
- Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran,
Iran
| | - Ali Akbari
- Department of Chemistry, Faculty
of Science, University of Maragheh, Golshahr,
P.O. Box. 55181-83111, Maragheh, Iran
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48
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An Improved Protocol for the Aldehyde Olefination Reaction Using (bmim) () as Reaction Medium. J CHEM-NY 2013. [DOI: 10.1155/2013/439673] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
[Ru(COD)Cl2]/CuCl2·2H2O/LiCl catalytic system works efficiently in ionic liquid media for aldehyde olefination reaction. It offers good yield and selectivity with the added advantage of 5 times recyclability for [Ru(COD)Cl2] /CuCl2·2H2O/LiCl catalytic system. We also successfully reduced the reaction time from 12 hours to 9 hours for the aldehyde olefination reaction.
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49
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Ballatore C, Brunden KR, Huryn DM, Trojanowski JQ, Lee VMY, Smith AB. Microtubule stabilizing agents as potential treatment for Alzheimer's disease and related neurodegenerative tauopathies. J Med Chem 2012; 55:8979-96. [PMID: 23020671 PMCID: PMC3493881 DOI: 10.1021/jm301079z] [Citation(s) in RCA: 129] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The microtubule (MT) associated protein tau, which is highly expressed in the axons of neurons, is an endogenous MT-stabilizing agent that plays an important role in axonal transport. Loss of MT-stabilizing tau function, caused by misfolding, hyperphosphorylation, and sequestration of tau into insoluble aggregates, leads to axonal transport deficits with neuropathological consequences. Several in vitro and preclinical in vivo studies have shown that MT-stabilizing drugs can be utilized to compensate for the loss of tau function and to maintain/restore effective axonal transport. These findings indicate that MT-stabilizing compounds hold considerable promise for the treatment of Alzheimer disease and related tauopathies. The present article provides a synopsis of the key findings demonstrating the therapeutic potential of MT-stabilizing drugs in the context of neurodegenerative tauopathies, as well as an overview of the different classes of MT-stabilizing compounds.
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Affiliation(s)
- Carlo Ballatore
- Department of Chemistry, School of Arts and Sciences, University of Pennsylvania, 231 South 34 St., Philadelphia, PA 19104-6323
- Center for Neurodegenerative Diseases Research and Institute on Aging, Perelman School of Medicine, University of Pennsylvania, 3600 Spruce Street, Philadelphia, PA 19104-6323
| | - Kurt R. Brunden
- Center for Neurodegenerative Diseases Research and Institute on Aging, Perelman School of Medicine, University of Pennsylvania, 3600 Spruce Street, Philadelphia, PA 19104-6323
| | - Donna M. Huryn
- Department of Chemistry, School of Arts and Sciences, University of Pennsylvania, 231 South 34 St., Philadelphia, PA 19104-6323
| | - John Q. Trojanowski
- Center for Neurodegenerative Diseases Research and Institute on Aging, Perelman School of Medicine, University of Pennsylvania, 3600 Spruce Street, Philadelphia, PA 19104-6323
| | - Virginia M.-Y. Lee
- Center for Neurodegenerative Diseases Research and Institute on Aging, Perelman School of Medicine, University of Pennsylvania, 3600 Spruce Street, Philadelphia, PA 19104-6323
| | - Amos B. Smith
- Department of Chemistry, School of Arts and Sciences, University of Pennsylvania, 231 South 34 St., Philadelphia, PA 19104-6323
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Zurwerra D, Glaus F, Betschart L, Schuster J, Gertsch J, Ganci W, Altmann KH. Total Synthesis of (−)-Zampanolide and Structure-Activity Relationship Studies on (−)-Dactylolide Derivatives. Chemistry 2012; 18:16868-83. [DOI: 10.1002/chem.201202553] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Indexed: 11/07/2022]
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