1
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Arora A, Kumar S, Kumar S, Singh SK, Dua A, Singh BK. Natural product inspired diastereoselective synthesis of sugar-derived pyrano[3,2-c]quinolones and their in-silico studies. Carbohydr Res 2024; 539:109105. [PMID: 38583285 DOI: 10.1016/j.carres.2024.109105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 04/02/2024] [Accepted: 04/02/2024] [Indexed: 04/09/2024]
Abstract
Herein, we report the development of a diastereoselective and efficient route to construct sugar-derived pyrano[3,2-c]quinolones utilizing 1-C-formyl glycal and 4-hydroxy quinolone annulation. This methodology will open a route to synthesize nature inspired pyrano[3,2-c]quinolones. This is the first report for the stereoselective synthesis of sugar-derived pyrano[3,2-c]quinolones, where 100% stereoselectivity was observed. A total of sixteen compounds have been synthesized in excellent yields with 100% stereoselectivity. The molecular docking of the synthesized novel natural product analogues demonstrated their binding modes within the active site of type II topoisomerase. The results of the in-silico studies displayed more negative binding energies for the all the synthesized compounds in comparison to the natural product huajiosimuline A, indicating their affinity for the active pocket. Ten out of the sixteen novel synthesized compounds were found to have comparative or relatively more negative binding energy in comparison to the standard anti-cancer drug, doxorubicin. Additionally, the scalability and viability of this protocol was illustrated by the gram scale synthesis.
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Affiliation(s)
- Aditi Arora
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Sumit Kumar
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India
| | - Sandeep Kumar
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India; Department of Chemistry, Ramjas College, University of Delhi, Delhi, 110007, India
| | - Sunil K Singh
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India; Department of Chemistry, Kirori Mal College, University of Delhi, Delhi, 110007, India
| | - Amita Dua
- Department of Chemistry, Dyal Singh College, University of Delhi, Delhi, 110007, India
| | - Brajendra K Singh
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India.
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2
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Kumar S, Sahu RK, Kumari P, Maity J, Kumar B, Chhatwal RJ, Singh BK, Prasad AK. Efficient and stereoselective synthesis of sugar fused pyrano[3,2- c]pyranones as anticancer agents. RSC Adv 2023; 13:24604-24616. [PMID: 37601594 PMCID: PMC10436030 DOI: 10.1039/d3ra02371k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 07/19/2023] [Indexed: 08/22/2023] Open
Abstract
A highly stereoselective, efficient and facile route was achieved for the synthesis of novel and biochemically potent sugar fused pyrano[3,2-c]pyranone derivatives starting from inexpensive, naturally occurring d-galactose and d-glucose. First, β-C-glycopyranosyl aldehydes were synthesized from these d-hexose sugars in six steps, with overall yields 41-55%. Next, two different 1-C-formyl glycals were synthesized from these β-C-glycopyranosyl aldehydes by treatment in basic conditions. The optimization of reaction conditions was carried out following reactions between 1-C-formyl galactal and 4-hydroxycoumarin. Next, 1-C-formyl galactal and 1-C-formyl glucal were treated with nine substituted 4-hydroxy coumarins at room temperature (25 °C) in ethyl acetate for ∼1-2 h in the presence of l-proline to obtain exclusively single diastereomers of pyrano[3,2-c]pyranone derivatives in excellent yields. Four compounds were found to be active for the MCF-7 cancer cell line. The MTT assay, apoptosis assay and migration analysis showed significant death of the cancer cells induced by the synthesized compounds.
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Affiliation(s)
- Sandeep Kumar
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
- Department of Chemistry, Ramjas College, University of Delhi Delhi-110007 India
| | - Ram Krishna Sahu
- National Institute of Cancer Prevention & Research Noida Uttar Pradesh India
| | - Priti Kumari
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
| | - Jyotirmoy Maity
- Department of Chemistry, St. Stephen College, University of Delhi Delhi-110007 India
| | - Binayak Kumar
- National Institute of Cancer Prevention & Research Noida Uttar Pradesh India
| | | | - Brajendra K Singh
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
| | - Ashok K Prasad
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
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Jeremias N, Peschel MT, Jaschke C, de Vivie-Riedle R, Bach T. Photochemical Ring Contraction of 5,5-Dialkylcyclopent-2-enones and in situ Trapping by Primary Amines. J Org Chem 2022; 88:6294-6303. [PMID: 35786889 DOI: 10.1021/acs.joc.2c01156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
If substituted in the 5,5-position, cyclopent-2-enones undergo a smooth photochemical rearrangement to ketenes. A concomitant cyclopropane formation occurs due to a 1,3-shift of the C5 carbon atom from the carbonyl carbon atom (C1) to carbon atom C3. In this study, the cyclopropyl-substituted ketene intermediates were trapped in situ by primary amines providing an efficient entry into 2,2-disubstituted cyclopropaneacetic amides (24 examples, 49-95% yield). A remarkable feature of the reaction is the fact that the photochemical rearrangement can occur from either the first excited singlet (S1) or the respective triplet state (T1). In line with experimental results (triplet quenching, sensitization), XMS-CASPT2 calculations support the existence of efficient reaction pathways to the intermediate ketene both on the singlet and on the triplet hypersurface.
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Affiliation(s)
- Noah Jeremias
- School of Natural Sciences, Department of Chemistry and Catalysis Research Center (CRC), Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Martin T Peschel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany
| | - Constantin Jaschke
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany
| | - Regina de Vivie-Riedle
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany
| | - Thorsten Bach
- School of Natural Sciences, Department of Chemistry and Catalysis Research Center (CRC), Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany
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4
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Baars J, Grimm I, Blunk D, Neudörfl J, Schmalz H. Enantioselektive Totalsynthese und Strukturrevision von Dysiherbol A. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Julian Baars
- University of Cologne Department of Chemistry Greinstraße 4 50939 Köln Deutschland
| | - Isabelle Grimm
- University of Cologne Department of Chemistry Greinstraße 4 50939 Köln Deutschland
| | - Dirk Blunk
- University of Cologne Department of Chemistry Greinstraße 4 50939 Köln Deutschland
| | - Jörg‐Martin Neudörfl
- University of Cologne Department of Chemistry Greinstraße 4 50939 Köln Deutschland
| | - Hans‐Günther Schmalz
- University of Cologne Department of Chemistry Greinstraße 4 50939 Köln Deutschland
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5
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Baars J, Grimm I, Blunk D, Neudörfl J, Schmalz H. Enantioselective Total Synthesis and Structural Revision of Dysiherbol A. Angew Chem Int Ed Engl 2021; 60:14915-14920. [PMID: 33978302 PMCID: PMC8251742 DOI: 10.1002/anie.202105733] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Indexed: 12/25/2022]
Abstract
A 12-step total synthesis of the natural product dysiherbol A, a strongly anti-inflammatory and anti-tumor avarane meroterpene isolated from the marine sponge Dysidea sp., was elaborated. As key steps, the synthesis features an enantioselective Cu-catalyzed 1,4-addition/enolate-trapping opening move, an Au-catalyzed double cyclization to build up the tetracyclic core-carbon skeleton, and a late installation of the C5-bridgehead methyl group via proton-induced cyclopropane opening associated with spontaneous cyclic ether formation. The obtained pentacyclic compound (corresponding to an anhydride of the originally suggested structure for dysiherbol A) showed identical spectroscopic data as the natural product, but an opposite molecular rotation. CD-spectroscopic measurements finally confirmed that both the constitution and the absolute configuration of the originally proposed structure of (+)-dysiherbol A need to be revised.
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Affiliation(s)
- Julian Baars
- University of CologneDepartment of ChemistryGreinstrasse 450939CologneGermany
| | - Isabelle Grimm
- University of CologneDepartment of ChemistryGreinstrasse 450939CologneGermany
| | - Dirk Blunk
- University of CologneDepartment of ChemistryGreinstrasse 450939CologneGermany
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6
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Hassaine R, El Haci IA, Dergal F, Boukennna L, Khoukh A, Negadi S, Taibi N, Bachari K, Choukchou-Braham N. Hemisynthesis of coumarin derivatives from Ammodaucus leucotrichus oil extract: organobase-catalyzed reaction, analytical study by diffusion-ordered spectroscopy NMR and differential scanning calorimetry. Nat Prod Res 2020; 36:2284-2291. [PMID: 33183085 DOI: 10.1080/14786419.2020.1828408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
This paper presents an in-depth chemical and analytical study of a natural substance extracted from Ammodaucus leucotrichus Coss. & Dur and its derivatives after hemisynthesis. The analysis was performed using Diffusion-Ordered Spectroscopy (NMR DOSY) and Differential Scanning Calorimetry (DSC) as general methods. The results show an interesting chemical reactivity towards coumarin-derived bisnucleophiles (4-hydroxycoumarin and triacetic acid lactone), and products obtained by hemisynthesis of pyrano[4,3-b]pyrane derivatives following Knoevenagel condensation and Michael's addition on this natural substance with the use of 4-pyrolidinopyridine organobase as catalyst.
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Affiliation(s)
- Ridha Hassaine
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie.,Laboratoire de Catalyse et Synthèse en Chimie Organique, Faculté des Sciences, Université de Tlemcen, Tlemcen, Algérie
| | - Imad Abdelhamid El Haci
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie.,Laboratoire de Produits Naturels, Département de Biologie, Faculté SNV-STU, Université Aboubekr Belkaid, Tlemcen, Algérie
| | - Fayçal Dergal
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie.,Laboratoire de Catalyse et Synthèse en Chimie Organique, Faculté des Sciences, Université de Tlemcen, Tlemcen, Algérie
| | - Leϊla Boukennna
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie.,Laboratoire de chimie organique appliquée, Faculté des Chimie, USTHB, Alger, Algérie
| | | | - Sofiane Negadi
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie.,Laboratoire de Catalyse et Synthèse en Chimie Organique, Faculté des Sciences, Université de Tlemcen, Tlemcen, Algérie
| | - Nadia Taibi
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie.,Laboratoire de Recherche sur Les Zones Arides (LRZA), Faculté des Sciences Biologiques (FSB), Université des Sciences et de La Technologie Houari Boumediene (USTHB), Bab Ezzouar, Algérie
| | - Khaldoun Bachari
- Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques CRAPC, Tipaza, Algérie
| | - Noureddine Choukchou-Braham
- Laboratoire de Catalyse et Synthèse en Chimie Organique, Faculté des Sciences, Université de Tlemcen, Tlemcen, Algérie
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7
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Reactions of 3-functionalized chromones with triacetic acid lactone. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.03.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Osyanin VA, Osipov DV, Semenova IA, Korzhenko KS, Lukashenko AV, Demidov OP, Klimochkin YN. Eco-friendly synthesis of fused pyrano[2,3- b]pyrans via ammonium acetate-mediated formal oxa-[3 + 3]cycloaddition of 4 H-chromene-3-carbaldehydes and cyclic 1,3-dicarbonyl compounds. RSC Adv 2020; 10:34344-34354. [PMID: 35514419 PMCID: PMC9056786 DOI: 10.1039/d0ra06450e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 08/26/2020] [Indexed: 11/21/2022] Open
Abstract
Various substituted polycyclic pyrano[2,3-b]pyrans were synthesized via the condensation of 4H-chromene-3-carbaldehydes and their areno-condensed analogues with hetero- and carbocyclic 1,3-dicarbonyl compounds in acetic acid. Ammonium acetate was used as a green catalyst for the reaction. The process also involves the subsequent Knoevenagel condensation and 6π-electrocyclization of the 1-oxatriene intermediates formed. Fused pyridines were isolated as the products of the conjugated addition of ammonia to 1-oxatriene intermediates while using carbocyclic 1,3-dicarbonyl compounds and increasing the reaction time, indicating the reversibility of the electrocyclization stage. The calculated values of the Gibbs free energies and reaction rate constants for the 1-oxatriene – 2H-pyran equilibrium also testified to the irreversibility of pyrano[2,3-b]pyran formation in the case of using of heterocyclic 1,3-dicarbonyl compounds. We report the eco-friendly synthesis of fused pyrano[2,3-b]pyrans via ammonium acetate-mediated formal oxa-[3 + 3]-cycloaddition of 4H-chromene-3-carbaldehydes and cyclic 1,3-dicarbonyl compounds.![]()
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Affiliation(s)
- Vitaly A. Osyanin
- Department of Organic Chemistry
- Chemical Technological Faculty
- Samara State Technical University
- Samara 443100
- Russia
| | - Dmitry V. Osipov
- Department of Organic Chemistry
- Chemical Technological Faculty
- Samara State Technical University
- Samara 443100
- Russia
| | - Irina A. Semenova
- Department of Organic Chemistry
- Chemical Technological Faculty
- Samara State Technical University
- Samara 443100
- Russia
| | - Kirill S. Korzhenko
- Department of Organic Chemistry
- Chemical Technological Faculty
- Samara State Technical University
- Samara 443100
- Russia
| | - A. V. Lukashenko
- Department of Organic Chemistry
- Chemical Technological Faculty
- Samara State Technical University
- Samara 443100
- Russia
| | - Oleg P. Demidov
- Department of Chemistry
- North Caucasus Federal University
- Stavropol 355009
- Russia
| | - Yuri N. Klimochkin
- Department of Organic Chemistry
- Chemical Technological Faculty
- Samara State Technical University
- Samara 443100
- Russia
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9
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Obydennov DL, El-Tantawy AI, Sosnovskikh VY. Triacetic acid lactone as a bioprivileged molecule in organic synthesis. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.01.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Spence JTJ, George JH. Total Synthesis of Peniphenones A–D via Biomimetic Reactions of a Common o-Quinone Methide Intermediate. Org Lett 2015; 17:5970-3. [DOI: 10.1021/acs.orglett.5b02902] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Justin T. J. Spence
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Jonathan H. George
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
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11
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Modulation of mitochondrial complex I activity averts cognitive decline in multiple animal models of familial Alzheimer's Disease. EBioMedicine 2015; 2:294-305. [PMID: 26086035 PMCID: PMC4465115 DOI: 10.1016/j.ebiom.2015.03.009] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Development of therapeutic strategies to prevent Alzheimer's Disease (AD) is of great importance. We show that mild inhibition of mitochondrial complex I with small molecule CP2 reduces levels of amyloid beta and phospho-Tau and averts cognitive decline in three animal models of familial AD. Low-mass molecular dynamics simulations and biochemical studies confirmed that CP2 competes with flavin mononucleotide for binding to the redox center of complex I leading to elevated AMP/ATP ratio and activation of AMP-activated protein kinase in neurons and mouse brain without inducing oxidative damage or inflammation. Furthermore, modulation of complex I activity augmented mitochondrial bioenergetics increasing coupling efficiency of respiratory chain and neuronal resistance to stress. Concomitant reduction of glycogen synthase kinase 3β activity and restoration of axonal trafficking resulted in elevated levels of neurotrophic factors and synaptic proteins in adult AD mice. Our results suggest metabolic reprogramming induced by modulation of mitochondrial complex I activity represents promising therapeutic strategy for AD.
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12
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Zhang Y, Wang S, Wu S, Zhu S, Dong G, Miao Z, Yao J, Zhang W, Sheng C, Wang W. Facile construction of structurally diverse thiazolidinedione-derived compounds via divergent stereoselective cascade organocatalysis and their biological exploratory studies. ACS COMBINATORIAL SCIENCE 2013; 15:298-308. [PMID: 23614347 DOI: 10.1021/co400022r] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In this article, we present a new approach by merging two powerful synthetic tactics, divergent synthesis and cascade organocatalysis, to create a divergent cascade organocatalysis strategy for the facile construction of new "privileged" substructure-based DOS (pDOS) library. As demonstrated, notably 5 distinct molecular architectures are produced facilely from readily available simple synthons thiazolidinedione and its analogues and α,β-unsaturated aldehydes in 1-3 steps with the powerful strategy. The beauty of the chemistry is highlighted by the efficient formation of structurally new and diverse products from structurally close reactants under the similar reaction conditions. Notably, structurally diverse spiro-thiazolidinediones and -rhodanines are produced from organocatalytic enantioselective 3-component Michael-Michael-aldol cascade reactions of respective thiazolidinediones and rhodanines with enals. Nevertheless, under the similar reaction conditions, reactions of isorhodanine via a Michael-cyclization cascade lead to structurally different fused thiopyranoid scaffolds. This strategy significantly minimizes time- and cost-consuming synthetic works. Furthermore, these molecules possess high structural complexity and functional, stereochemical, and skeletal diversity with similarity to natural scaffolds. In the preliminary biological studies of these molecules, compounds 4f, 8a, and 10a exhibit inhibitory activity against the human breast cancer cells, while compounds 8a, 9a, and 9b display good antifungal activities against Candida albicans and Cryptococcus neoformans. Notably, their structures are different from clinically used triazole antifungal drugs. Therefore, they could serve as good lead compounds for the development of new generation of antifungal agents.
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Affiliation(s)
- Yongqiang Zhang
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Shengzheng Wang
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Shanchao Wu
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Shiping Zhu
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Guoqiang Dong
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Zhenyuan Miao
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Jianzhong Yao
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Wannian Zhang
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Chunquan Sheng
- Department of Medicinal Chemistry,
School of Pharmacy, Second Military Medical University, 325 Guohe Road, Shanghai 200433, P. R. China
| | - Wei Wang
- Department of Chemistry and
Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
- School of Pharmacy, East China University of Science and Technology, Shanghai
200237, P. R. China
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13
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Silva AL, Toscano RA, Maldonado LA. An Enantioselective Approach to Furanoeremophilanes: (+)-9-Oxoeuryopsin. J Org Chem 2013; 78:5282-92. [DOI: 10.1021/jo400399q] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ana L. Silva
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito
Exterior, Ciudad Universitaria, Coyoacán, México DF
04510, Mexico
| | - Rubén A. Toscano
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito
Exterior, Ciudad Universitaria, Coyoacán, México DF
04510, Mexico
| | - Luis A. Maldonado
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito
Exterior, Ciudad Universitaria, Coyoacán, México DF
04510, Mexico
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14
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Abstract
Collaborative research projects between chemists, biologists, and medical scientists have inevitably produced many useful drugs, biosensors, and medical instrumentation. Organic chemistry lies at the heart of drug discovery and development. The current range of organic synthetic methodologies allows for the construction of unlimited libraries of small organic molecules for drug screening. In translational research projects, we have focused on the discovery of lead compounds for three major diseases: Alzheimer's disease (AD), breast cancer, and viral infections. In the AD project, we have taken a rational-design approach and synthesized a new class of tricyclic pyrone (TP) compounds that preserve memory and motor functions in amyloid precursor protein (APP)/presenilin-1 (PS1) mice. TPs could protect neuronal death through several possible mechanisms, including their ability to inhibit the formation of both intraneuronal and extracellular amyloid β (Aβ) aggregates, to increase cholesterol efflux, to restore axonal trafficking, and to enhance long-term potentiation (LTP) and restored LTP following treatment with Aβ oligomers. We have also synthesized a new class of gap-junction enhancers, based on substituted quinolines, that possess potent inhibitory activities against breast-cancer cells in vitro and in vivo. Although various antiviral drugs are available, the emergence of viral resistance to existing antiviral drugs and various understudied viral infections, such as norovirus and rotavirus, emphasizes the demand for the development of new antiviral agents against such infections and others. Our laboratories have undertaken these projects for the discovery of new antiviral inhibitors. The discussion of these aforementioned projects may shed light on the future development of drug candidates in the fields of AD, cancer, and viral infections.
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Affiliation(s)
- Duy H Hua
- Department of Chemistry, 213 CBC Building, Kansas State University, Manhattan, KS 66506-040, USA.
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15
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Riveira MJ, Mischne MP. Green One-Pot Synthesis of 2H-Pyrans Under Solvent-Free Conditions Catalyzed by Ethylenediammonium Diacetate. SYNTHETIC COMMUN 2013. [DOI: 10.1080/00397911.2011.594975] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Fotiadou AD, Zografos AL. Electrocyclization of Oxatrienes in the Construction of Structurally Complex Pyranopyridones. Org Lett 2012; 14:5664-7. [DOI: 10.1021/ol3026457] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anna D. Fotiadou
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece
| | - Alexandros L. Zografos
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece
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17
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Abstract
This critical review offers an overview of asymmetric electrocyclic processes, where diastereo- or enantioselectivity is a consequence of the influence of a chiral component (be it substrate or catalyst) on the electrocyclic bond-forming process (195 references).
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Affiliation(s)
- Sam Thompson
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK
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18
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Al-Rashid ZF, Hsung RP. (+)-Arisugacin A--computational evidence of a dual binding site covalent inhibitor of acetylcholinesterase. Bioorg Med Chem Lett 2011; 21:2687-91. [PMID: 21216144 PMCID: PMC3082004 DOI: 10.1016/j.bmcl.2010.12.041] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 12/04/2010] [Accepted: 12/07/2010] [Indexed: 01/14/2023]
Abstract
A computation docking study of the highly potent, non-nitrogen containing, acetylcholinesterase inhibitor (+)-arisugacin A is presented. The model suggests that (+)-arisugacin A is a dual binding site covalent inhibitor of AChE. These findings are examined in the context of Alzheimer's disease-modifying therapeutic design. (+)-Arisugacin A's revealed mode of action is unique, and may serve as a basis for the development of AD therapeutics capable of treating the symptomatic aspects of AD, while being neuroprotective with long term efficacy.
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Affiliation(s)
- Ziyad F. Al-Rashid
- Alchemical Research, LLC, 426 Heckewelder Place, Bethlehem, Pennsylvania 18018, USA
| | - Richard P Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA
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19
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Moreau J, Hubert C, Batany J, Toupet L, Roisnel T, Hurvois JP, Renaud JL. Metal-Free Brønsted Acid Catalyzed Formal [3 + 3] Annulation. Straightforward Synthesis of Dihydro-2H-Chromenones, Pyranones, and Tetrahydroquinolinones. J Org Chem 2009; 74:8963-73. [PMID: 19950880 DOI: 10.1021/jo901238y] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Julie Moreau
- Sciences Chimiques de Rennes, Catalyse et Organométalliques, UMR 6226
| | - Claudie Hubert
- Sciences Chimiques de Rennes, Catalyse et Organométalliques, UMR 6226
| | - Jessika Batany
- Sciences Chimiques de Rennes, Catalyse et Organométalliques, UMR 6226
| | - Loic Toupet
- Institut de Physique de Rennes, Groupe Matière Condensée et Matériaux, UMR 6626
| | - Thierry Roisnel
- Sciences Chimiques de Rennes, Diffraction Rayons-X, UMR 6226
| | | | - Jean-Luc Renaud
- Laboratoire de Chimie Moléculaire et Thioorganique, UMR 6507, INC3M, FR 3038, ENSICAEN-Université de Caen, 14050 Caen, France
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20
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Ferreira SB, da Silva FDC, Pinto AC, Gonzaga DTG, Ferreira VF. Syntheses of chromenes and chromanesvia o-quinone methide intermediates. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.232] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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21
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Sagar R, Park J, Koh M, Park SB. Diastereoselective Synthesis of Polycyclic Acetal-Fused Pyrano[3,2-c]pyran-5(2H)-one Derivatives. J Org Chem 2009; 74:2171-4. [DOI: 10.1021/jo8023889] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Ram Sagar
- Department of Chemistry, Seoul National University, Seoul 151-747, Korea
| | - Jongmin Park
- Department of Chemistry, Seoul National University, Seoul 151-747, Korea
| | - Minseob Koh
- Department of Chemistry, Seoul National University, Seoul 151-747, Korea
| | - Seung Bum Park
- Department of Chemistry, Seoul National University, Seoul 151-747, Korea
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22
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Rana S, Hong HS, Barrigan L, Jin LW, Hua DH. Syntheses of tricyclic pyrones and pyridinones and protection of Abeta-peptide induced MC65 neuronal cell death. Bioorg Med Chem Lett 2008; 19:670-4. [PMID: 19121940 DOI: 10.1016/j.bmcl.2008.12.060] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Revised: 12/09/2008] [Accepted: 12/10/2008] [Indexed: 12/20/2022]
Abstract
The SbetaC gene is conditionally expressed a 99-residue carboxy terminal fragment, C99, of amyloid precursor protein in MC65 cells and causes cell death. Consequently, MC65 cell line was used to identify inhibitors of toxicity related to intracellular amyloid beta (Abeta) oligomers. Compounds that reduce the level of Abeta peptides, prevent Abeta aggregation, or eliminate existing Abeta aggregates may be used in the treatment of Alzheimer's disease (AD). Previously, we found that a tricyclic pyrone (TP) molecule, compound 1, prevents MC65 cell death and inhibits Abeta aggregation. Hence various TPs containing heterocycle at C7 side chain and a nitrogen at position 2 or 5 were synthesized and their MC65 cell protective activities evaluated. TPs containing N3'-adenine moiety such as compounds 1 and 11 are most active with EC(50) values of 0.31 and 0.35 microM, respectively. EC(50) values of tricyclic N5-analog, pyranoisoquinolinone 13, and N2-analog, pyranopyridinone 20, are 2.49 and 1.25 microM, respectively, despite the lack of adenine moiety. Further investigation of tricyclic N2- and N5-analogs is warranted.
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Affiliation(s)
- Sandeep Rana
- Department of Chemistry, Kansas State University, Manhattan, KS 66506-3701, USA
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23
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Brioche JCR, Goodenough KM, Whatrup DJ, Harrity JPA. Investigation of an Organomagnesium-Based [3 + 3] Annelation to Pyrans and Its Application in the Synthesis of Rhopaloic Acid A. J Org Chem 2008; 73:1946-53. [DOI: 10.1021/jo702620e] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Julien C. R. Brioche
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, United Kingdom, and GlaxoSmithKline Research and Development, Tonbridge, Kent, TN11 9AN, United Kingdom
| | - Katharine M. Goodenough
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, United Kingdom, and GlaxoSmithKline Research and Development, Tonbridge, Kent, TN11 9AN, United Kingdom
| | - David J. Whatrup
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, United Kingdom, and GlaxoSmithKline Research and Development, Tonbridge, Kent, TN11 9AN, United Kingdom
| | - Joseph P. A. Harrity
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, United Kingdom, and GlaxoSmithKline Research and Development, Tonbridge, Kent, TN11 9AN, United Kingdom
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24
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Brioche JCR, Goodenough KM, Whatrup DJ, Harrity JPA. A [3 + 3] Annelation Approach to (+)-Rhopaloic Acid B. Org Lett 2007; 9:3941-3. [PMID: 17760451 DOI: 10.1021/ol701553j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A general and enantiospecific [3 + 3] reaction toward functionalized pyrans is reported that has been employed in the first enantioselective synthesis of (+)-rhopaloic acid B.
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Affiliation(s)
- Julien C R Brioche
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, United Kingdom
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25
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26
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Ridley CP, Khosla C. Synthesis and biological activity of novel pyranopyrones derived from engineered aromatic polyketides. ACS Chem Biol 2007; 2:104-8. [PMID: 17256996 DOI: 10.1021/cb600382j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The 4-hydroxy-2-pyrone moiety is commonly observed in polyketides generated via biosynthetic engineering of type II polyketide synthases. To explore the synthetic utility of these 2-pyrones, four engineered polyketides (mutactin, SEK4, SEK15, and SEK15b) were isolated from appropriate derivatives of Streptomyces coelicolor CH999. As a test case, we prepared nine novel pyranopyrones through condensation reactions with either citral, 1-cyclohexene-carboxaldehyde, or S-perillaldehyde. Synthetic tricyclic pyranopyrones with simple aromatic substituents are known to possess anticancer properties. We therefore investigated whether pyranopyrone derivatives of aromatic polyketides exhibited bioactivity in a panel of three cancer cell lines. Pyranopyrones generated from SEK4 had activity comparable to that of H10, a pyranopyrone with a 3-pyridyl substituent, whereas other analogues were less active. These results suggest that the diverse library of carbo- and heterocycles available through the genetic engineering of type II polyketide synthases can serve as useful building blocks to generate unique bioactive molecules.
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27
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Leutbecher H, Williams LAD, Rösner H, Beifuss U. Efficient synthesis of substituted 7-methyl-2H,5H-pyrano[4,3-b]pyran-5-ones and evaluation of their in vitro antiproliferative/cytotoxic activities. Bioorg Med Chem Lett 2007; 17:978-82. [PMID: 17166717 DOI: 10.1016/j.bmcl.2006.11.045] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2006] [Revised: 11/13/2006] [Accepted: 11/13/2006] [Indexed: 11/28/2022]
Abstract
Substituted 7-methyl-2H,5H-pyrano[4,3-b]pyran-5-ones and related heterocycles 3 were synthesized through an efficient domino Knoevenagel condensation/6pi-electron electrocyclization. In vitro antiproliferative/cytotoxic activity evaluation was performed with human SH-SY5Y neuroblastoma cells and revealed IC(50) values ranging from 6.7 to >200microM. The compound that was most cytotoxic to the neuroblastoma cells, that is, 2-isobutyl-3-isopropyl-7-methyl-2H,5H-pyrano[4,3-b]pyran-5-one (3a), also exhibited necrotic effects on the human IPC melanoma cells.
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Affiliation(s)
- Heiko Leutbecher
- Bioorganische Chemie, Institut für Chemie der Universität Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany
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28
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Hong HS, Maezawa I, Yao N, Xu B, Diaz-Avalos R, Rana S, Hua DH, Cheng RH, Lam KS, Jin LW. Combining the rapid MTT formazan exocytosis assay and the MC65 protection assay led to the discovery of carbazole analogs as small molecule inhibitors of Abeta oligomer-induced cytotoxicity. Brain Res 2006; 1130:223-34. [PMID: 17157826 PMCID: PMC1880896 DOI: 10.1016/j.brainres.2006.10.093] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2006] [Revised: 10/25/2006] [Accepted: 10/26/2006] [Indexed: 11/18/2022]
Abstract
The discovery of small molecule inhibitors of cytotoxicity induced by amyloid-beta (Abeta) oligomers, either applied extracellularly or accumulated intraneuronally, is an important goal of drug development for Alzheimer's disease (AD), but has been limited by the lack of efficient screening methods. Here we describe our approach using two cell-based methods. The first method takes advantage of the unique ability of extracellularly applied Abeta oligomers to rapidly induce the exocytosis of formazan formed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). We employed a short protocol to quantify this toxicity, and quickly identified two novel inhibitors, code-named CP2 and A5, from two compound libraries. A second independent screen of the same libraries using our previously published MC65 protection assay, which identifies inhibitors of toxicity related to intracellular Abeta oligomers, also selected the same two leads, suggesting that both assays select for the same anti-Abeta oligomer properties displayed by these compounds. We further demonstrated that A5 attenuated the progressive aggregation of existing Abeta oligomers, reduced the level of intracellular Abeta oligomers, and prevented the Abeta oligomer-induced death of primary cortical neurons, effects similar to those demonstrated by CP2. Our results suggest that, when combined, the two methods would generate fewer false results and give a high likelihood of identifying leads that show promises in ameliorating Abeta oligomer-induced toxicities within both intraneuronal and extracellular sites. Both assays are simple, suitable for rapid screening of a large number of medicinal libraries, and amenable for automation.
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Affiliation(s)
- Hyun-Seok Hong
- M.I.N.D. Institute and Department of Pathology, UC Davis Cancer Center, University of California Davis, Sacramento, CA 95817, USA
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29
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Maezawa I, Hong HS, Wu HC, Battina SK, Rana S, Iwamoto T, Radke GA, Pettersson E, Martin GM, Hua DH, Jin LW. A novel tricyclic pyrone compound ameliorates cell death associated with intracellular amyloid-beta oligomeric complexes. J Neurochem 2006; 98:57-67. [PMID: 16805796 DOI: 10.1111/j.1471-4159.2006.03862.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The neurotoxicity of amyloid-beta protein (Abeta) is widely regarded as one of the fundamental causes of neurodegeneration in Alzheimer's disease (AD). This toxicity is related to Abeta aggregation into oligomers, protofibrils and fibrils. Recent studies suggest that intracellular Abeta, which causes profound toxicity, could be one of the primary therapeutic targets in AD. So far, no compounds targeting intracellular Abeta have been identified. We have investigated the toxicity induced by intracellular Abeta in a neuroblastoma MC65 line and found that it was closely related to intracellular accumulation of oligomeric complexes of Abeta (Abeta-OCs). We further identified a cell-permeable tricyclic pyrone named CP2 that ameliorates this toxicity and significantly reduces the levels of Abeta-OCs. In aqueous solution, CP2 attenuates Abeta oligomerization and prevents the oligomer-induced death of primary cortical neurons. CP2 analogs represent a new class of promising compounds for the amelioration of Abeta toxicities within both intracellular and extracellular sites.
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Affiliation(s)
- Izumi Maezawa
- MIND Institute and Department of Pathology, University of California Davis, Sacramento, California, USA
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30
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Sunazuka T, Omura S. Total synthesis of alpha-pyrone meroterpenoids, novel bioactive microbial metabolites. Chem Rev 2006; 105:4559-80. [PMID: 16351054 DOI: 10.1021/cr040628i] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Toshiaki Sunazuka
- Kitasato Institute for Life Sciences, Kitasato University, and The Kitasato Institute, Shirokane, Minato-ku, Japan
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31
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Schmidt D, Conrad J, Klaiber I, Beifuss U. Synthesis of the bis-potassium salts of 5-hydroxy-3-oxopent-4-enoic acids and their use for the efficient preparation of 4-hydroxy-2H-pyran-2-ones and other heterocycles. Chem Commun (Camb) 2006:4732-4. [PMID: 17109052 DOI: 10.1039/b611105j] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
5-Hydroxy-3-oxopent-4-enoic acid esters can be efficiently transformed into the stable bis-potassium salts of the corresponding 5-hydroxy-3-oxopent-4-enoic acids, from which the sensitive acids are released in situ, the latter being converted into substituted 4-hydroxy-2H-pyran-2-ones, pyrazoles and isoxazoles under mild conditions; the efficiency of this method is demonstrated by the first synthesis of two naturally occurring pyrones.
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Affiliation(s)
- Dietmar Schmidt
- Bioorganische Chemie, Institut für Chemie, Universität Hohenheim, Garbenstrasse 30, D-70599 Stuttgart, Germany
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32
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McGlacken GP, Fairlamb IJS. 2-Pyrone natural products and mimetics: isolation, characterisation and biological activity. Nat Prod Rep 2005; 22:369-85. [PMID: 16010346 DOI: 10.1039/b416651p] [Citation(s) in RCA: 268] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The review summarises natural products containing the 2-pyrone moiety. An emphasis has been placed upon the biological activity associated with 2-pyrones, particularly with respect to potential therapeutic or anti-microbial agents. Where appropriate, non-natural 2-pyrone analogues are discussed, particularly those derived from natural product lead compounds.
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Affiliation(s)
- Gerard P McGlacken
- Department of Chemistry, University of York, Heslington, York, UK YO10 5DD
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33
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Sagar R, Singh P, Kumar R, Maulik PR, Shaw AK. Diastereoselective annulation of 4-hydroxypyran-2H-ones with enantiopure 2,3-dideoxy-α,β-unsaturated sugar aldehydes derived from respective glycals. Carbohydr Res 2005; 340:1287-300. [PMID: 15854598 DOI: 10.1016/j.carres.2005.02.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2004] [Accepted: 02/18/2005] [Indexed: 11/17/2022]
Abstract
One-pot condensations of 4-hydroxypyran-2H-ones 1 and 2, respectively, with various enantiopure 2,3-dideoxy-alpha,beta-unsaturated carbohydrate enals in the presence of l-proline in EtOAc at room temperature generated pyrano-pyrones. It was observed that, while benzyl-protected carbohydrate enals on condensation with 1 or 2 under the above conditions produced an inseparable diastereomeric mixture in a ratio of 1:1, the acyl-protected carbohydrate enals on treatment with 1 or 2 under identical conditions yielded products with moderate to very high diastereoselectivity. A remarkable asymmetric induction was noticed from the C-4 stereogenic center of the acyl-protected carbohydrate enals. An almost complete diastereoselectivity was observed in those reactions that involved condensation of 1 with acetyl-protected enals 5 and 7. The reaction of 2 with 5 also proceeded diastereoselectively to furnish the corresponding annulated product. The reaction presumably took place by C-1,2-addition of the pyrone onto the iminium salt of the alpha,beta-unsaturated carbohydrate enal generated in situ, followed by beta-elimination and cyclization of the 1-oxatriene involving a 6pi-electron electrocyclic process to yield a 2H,5H-pyrano[3,2-c]pyran-5-one derivative.
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Affiliation(s)
- Ram Sagar
- Division of Medicinal and Process Chemistry, Central Drug Research Institute (CDRI), Lucknow 226001, India
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34
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Hsung R, Kurdyumov A, Sydorenko N. A Formal [3 + 3] Cycloaddition Approach to Natural‐Product Synthesis. European J Org Chem 2004. [DOI: 10.1002/ejoc.200400567] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Richard P. Hsung
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Aleksey V. Kurdyumov
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
| | - Nadiya Sydorenko
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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35
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Mediavilla Urbaneja L, Krause N. Synthesis of Novel Bifunctional Michael Acceptors. European J Org Chem 2004. [DOI: 10.1002/ejoc.200400419] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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Sunazuka T, Handa M, Nagai K, Shirahata T, Harigaya Y, Otoguro K, Kuwajima I, Ōmura S. Absolute stereochemistries and total synthesis of (+)-arisugacins A and B, potent, orally bioactive and selective inhibitors of acetylcholinesterase. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.059] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Hsung RP, Cole KP. The Total Synthesis of (-)-Arisugacin A. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s1874-6004(04)80007-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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38
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Anderson JC, Blake AJ, Graham JP, Wilson C. Investigation of the asymmetric ionic Diels-Alder reaction for the synthesis of cis-decalins. Org Biomol Chem 2003; 1:2877-85. [PMID: 12968338 DOI: 10.1039/b305116a] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ionic Diels-Alder reaction, whereby an alpha,beta-unsaturated acetal in combination with a Lewis or Bronsted acid forms an equilibrium concentration of an activated dienophile, has been developed to provide an enantioselective synthesis of cis-decalins. Cyclohex-2-enone type chiral acetals of (2R,3R)-butane-2,3-diol have been screened against Lewis and Brønsted acids with a variety of dienes and are efficient for the synthesis of a limited subset of cis-decalin structures. Diastereoselectivities of 73% and 82% have been found for the asymmetric ionic Diels-Alder reaction between the chiral acetal derivatives of cyclohex-2-enone (6) and 2-methylcyclohex-2-enone (18) with 2,3-dimethyl-1,3-butadiene (7). Terminal substituents on the diene partner in general render the system unreactive. However a synthetically useful cis-decalin 31, derived from the reaction of 2-methylcyclohex-2-enone and Z-3-t-butyldimethyl-silyloxypenta-1,3-diene has been prepared in enantiomerically pure form in 74% isolated yield using this asymmetric ionic Diels-Alder protocol.
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Affiliation(s)
- James C Anderson
- School of Chemistry, University of Nottingham, Nottingham, UK NG7 2RD.
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39
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40
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Shen HC, Wang J, Cole KP, McLaughlin MJ, Morgan CD, Douglas CJ, Hsung RP, Coverdale HA, Gerasyuto AI, Hahn JM, Liu J, Sklenicka HM, Wei LL, Zehnder LR, Zificsak CA. A formal [3 + 3] cycloaddition reaction. Improved reactivity using alpha,beta-unsaturated iminium salts and evidence for reversibility of 6pi-electron electrocyclic ring closure of 1-oxatrienes. J Org Chem 2003; 68:1729-35. [PMID: 12608785 DOI: 10.1021/jo020688t] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A detailed account regarding a formal [3 + 3] cycloaddition method using 4-hydroxy-2-pyrones and 1,3-diketones is described here. This formal cycloaddition reaction or annulation reaction is synthetically useful for constructing 2H-pyranyl heterocycles. The usage of alpha,beta-unsaturated iminium salts is significant in controlling competing reaction pathways to give exclusively 2H-pyrans. Most significantly, experimental evidence is provided to support the mechanism of this reaction that involves a sequential Knoevenagel condensation and a reversible 6pi-electron electrocyclic ring-closure of 1-oxatrienes.
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Affiliation(s)
- Hong C Shen
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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41
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42
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Sklenicka HM, Hsung RP, McLaughlin MJ, Wei LL, Gerasyuto AI, Brennessel WB. Stereoselective formal [3 + 3] cycloaddition approach to cis-1-azadecalins and synthesis of (-)-4a,8a-diepi-pumiliotoxin C. evidence for the first highly stereoselective 6pi-electron electrocyclic ring closures of 1-azatrienes. J Am Chem Soc 2002; 124:10435-42. [PMID: 12197745 DOI: 10.1021/ja020698b] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Evidence is described here to support that a highly stereoselective 6pi-electron electrocyclic ring closure of 1-azatrienes is a key step in formal [3 + 3] cycloaddition or annulation reactions of chiral vinylogous amides with alpha,beta-unsaturated iminium salts. This would represent the first highly stereoselective 6pi-electron electrocyclic ring closure of 1-azatrienes. We have also unambiguously demonstrated that these specific ring closures are reversible, leading to the major diastereomer that is also thermodynamically more stable, and that a rotation preference likely also plays a role. A synthetic application is illustrated here to stereoselectively transform the resulting dihydropyridines to cis-1-azadecalins with unique anti relative stereochemistry at C2 and C2a, leading to synthesis of epi isomers of (-)-pumiliotoxin C.
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Affiliation(s)
- Heather M Sklenicka
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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43
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Jin LW, Hua DH, Shie FS, Maezawa I, Sopher B, Martin GM. Novel tricyclic pyrone compounds prevent intracellular APP C99-induced cell death. J Mol Neurosci 2002; 19:57-61. [PMID: 12212794 DOI: 10.1007/s12031-002-0011-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2001] [Accepted: 10/16/2001] [Indexed: 12/31/2022]
Abstract
Alzheimer's disease (AD) is an age-related neurodegenerative disorder characterized by the progressive and global loss of cognitive functions. Pathological features include a loss of neurons in vulnerable brain regions and the extracellular deposition of abnormal protein aggregates known as amyloid plaques. Amyloid-beta protein (A beta is the major component of amyloid plaques and is derived from a larger transmembrane glycoprotein, termed amyloid beta protein precursor (APP), by proteolysis. The AD research has focused on A beta production and metabolism, its extracellular deposition, and its cellular toxicity. Recent evidence, however, suggests that A beta as well as the C-terminal fragments (CTF) of APP can accumulate intraneuronally. The neuronal loss and synaptic transmission deficit in AD may therefore depend on intraneuronal accumulation of A beta/CTF rather than on extracellular plaque formation. Accordingly, we propose that one of the primary targets of therapeutic intervention should be intracellular A beta/CTF and its toxic cellular effect. We have established a cell-culture model in which the neurons degenerate on induction of endogenous expression of A beta/CTF of APP. These cultures have been used to test whether tricyclic pyrone (TP) compounds may prevent A beta/CTF-mediated neuronal death. The results to date have been encouraging. Lead compounds will now be selected for their abilities to ameliorate A beta/CTF-mediated pathology in transgenic mice. Our hope is that these compounds may eventually prove beneficial for the prevention and treatment of AD.
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Affiliation(s)
- Lee-Way Jin
- Department of Pathology, University of Washington, Seattle 98195-7470, USA.
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44
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Rajnikant, Gupta VK, Deshmukh MB, Varghese B, Dinesh. Crystal structure analysis of 4-phenylquinolin-2-(1H)-one. CRYSTALLOGR REP+ 2002. [DOI: 10.1134/1.1481933] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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45
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A facile three-component reaction involving [4+1] cycloaddition leading to furan annulated heterocycles. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00226-5] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Coelho F, Diaz G. Studies on the synthesis of (±)-pathylactone A, a nor-sesquiterpene lactone isolated from marine sources. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00058-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nair V, Jayan C, Radhakrishnan K, Anilkumar G, Rath NP. [4+2] Cycloaddition reactions of coumarin quinone methide with pentafulvenes: facile synthesis of novel polycyclic pyran derivatives. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00471-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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An unexpected ring-opening of a 2-pyrone ring at low temperatures. A mild and expeditious synthesis of novel coumarins. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00456-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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McLaughlin MJ, Shen HC, Hsung RP. Chiral cycloalkylidene α,β-unsaturated iminium approach to stereoselective formal [3+3] cycloaddition reaction in spiroheterocycle synthesis. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02018-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zehnder L, Hsung R, Wang J, Golding G. A Concise Stereoselective Route to the Pentacyclic Frameworks of Arisugacin A and Territrem B. Angew Chem Int Ed Engl 2000; 39:3876-3879. [DOI: 10.1002/1521-3773(20001103)39:21<3876::aid-anie3876>3.0.co;2-c] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2000] [Indexed: 11/08/2022]
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