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Gummerlich N, Rebets Y, Paulus C, Zapp J, Luzhetskyy A. Targeted Genome Mining-From Compound Discovery to Biosynthetic Pathway Elucidation. Microorganisms 2020; 8:microorganisms8122034. [PMID: 33352664 PMCID: PMC7765855 DOI: 10.3390/microorganisms8122034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/13/2020] [Accepted: 12/15/2020] [Indexed: 11/16/2022] Open
Abstract
Natural products are an important source of novel investigational compounds in drug discovery. Especially in the field of antibiotics, Actinobacteria have been proven to be a reliable source for lead structures. The discovery of these natural products with activity- and structure-guided screenings has been impeded by the constant rediscovery of previously identified compounds. Additionally, a large discrepancy between produced natural products and biosynthetic potential in Actinobacteria, including representatives of the order Pseudonocardiales, has been revealed using genome sequencing. To turn this genomic potential into novel natural products, we used an approach including the in-silico pre-selection of unique biosynthetic gene clusters followed by their systematic heterologous expression. As a proof of concept, fifteen Saccharothrixespanaensis genomic library clones covering predicted biosynthetic gene clusters were chosen for expression in two heterologous hosts, Streptomyceslividans and Streptomycesalbus. As a result, two novel natural products, an unusual angucyclinone pentangumycin and a new type II polyketide synthase shunt product SEK90, were identified. After purification and structure elucidation, the biosynthetic pathways leading to the formation of pentangumycin and SEK90 were deduced using mutational analysis of the biosynthetic gene cluster and feeding experiments with 13C-labelled precursors.
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Affiliation(s)
- Nils Gummerlich
- Department of Pharmaceutical Biotechnology, Saarland University, Campus C2.3, 66123 Saarbrücken, Germany; (N.G.); (Y.R.); (C.P.)
| | - Yuriy Rebets
- Department of Pharmaceutical Biotechnology, Saarland University, Campus C2.3, 66123 Saarbrücken, Germany; (N.G.); (Y.R.); (C.P.)
| | - Constanze Paulus
- Department of Pharmaceutical Biotechnology, Saarland University, Campus C2.3, 66123 Saarbrücken, Germany; (N.G.); (Y.R.); (C.P.)
| | - Josef Zapp
- Department of Pharmaceutical Biology, Saarland University, Campus C2.3, 66123 Saarbrücken, Germany;
| | - Andriy Luzhetskyy
- Department of Pharmaceutical Biotechnology, Saarland University, Campus C2.3, 66123 Saarbrücken, Germany; (N.G.); (Y.R.); (C.P.)
- Actinobacteria Metabolic Engineering Group, Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Campus E8.1, 66123 Saarbrücken, Germany
- Correspondence: ; Tel.: +49-681-302-70200
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2
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Affiliation(s)
- Jianhua Chen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Yayue Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Zheming Xiao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Haibing He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, China
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3
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Srivastava S. Knoevenagel Condensation and Michael Addition in Bio‐Renewable Deep Eutectic Solvent: Facile Synthesis of a Library of Bis‐enol Derivatives. ChemistrySelect 2020. [DOI: 10.1002/slct.201904806] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Suman Srivastava
- Department of Applied Sciences National Institute of Technology, Delhi NILERD CampusA-7, Institutional Area, Near Satyawadi Raja Harish Chandra Hospital Narela Delhi – 110040
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4
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Sharma H, Srivastava S. Anion functionalized ionic liquid from artificial sugar: a sustainable pathway for diverse bis-enol derivatives. NEW J CHEM 2019. [DOI: 10.1039/c9nj01899a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An artificial sugar saccharine based anion-functionalized ionic liquid [Bmim]Sac was synthesized and used for new and straightforward strategies for the construction of a diverse range of bis-enols.
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Affiliation(s)
- Himani Sharma
- Department of Applied Sciences
- National Institute of Technology Delhi
- Delhi
- India
| | - Suman Srivastava
- Department of Applied Sciences
- National Institute of Technology Delhi
- Delhi
- India
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5
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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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6
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Lashgari N, Mohammadi Ziarani G, Moradi R, Zandiyeh M. 4-Hydroxy-6-methyl-2-pyrone: A Versatile Synthon in the Synthesis of Heterocyclic Scaffolds via Multicomponent Reactions. HETEROCYCLES 2018. [DOI: 10.3987/rev-17-872] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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Yao H, Song L, Liu Y, Tong R. Cascade Michael Addition/Cycloketalization of Cyclic 1,3-Dicarbonyl Compounds: Important Role of the Tethered Alcohol of α,β-Unsaturated Carbonyl Compounds on Reaction Rate and Regioselectivity. J Org Chem 2014; 79:8774-85. [DOI: 10.1021/jo501604e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Hongliang Yao
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Liyan Song
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Yuan Liu
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
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8
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Song L, Yao H, Zhu L, Tong R. Asymmetric Total Syntheses of (−)-Penicipyrone and (−)-Tenuipyrone via Biomimetic Cascade Intermolecular Michael Addition/Cycloketalization. Org Lett 2012; 15:6-9. [DOI: 10.1021/ol303071t] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Liyan Song
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Hongliang Yao
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Liangyu Zhu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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9
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Buchanan GS, Cole KP, Li G, Tang Y, You LF, Hsung RP. Constructing the Architecturally Distinctive ABD-Tricycle of Phomactin A through an Intramolecular Oxa-[3 + 3] Annulation Strategy. Tetrahedron 2011; 67:10105-10118. [PMID: 23750054 PMCID: PMC3676308 DOI: 10.1016/j.tet.2011.09.111] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Our efforts in constructing the ABD-ring of phomactin A through an intramolecular oxa-[3 + 3] annulation strategy is described. This struggle entailed finding a practical and efficient preparation of annulation precursor, and a realization of the unexpected competing regioisomeric pathway. The success entailed accessing the A-ring through Diels-Alder cycloaddition of Rawal's diene. Furthermore, the discovery that the regioisomers from the annulation existed as atropisomers with respect to the D-ring olefin and that they could be equilibrated to the desired ABD-tricycle, allowing large quantities of tricycle to be accessed.
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Affiliation(s)
- Grant S Buchanan
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705 USA
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10
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Buchanan GS, Cole KP, Tang Y, Hsung RP. Total synthesis of (±)-phomactin A. Lessons learned from respecting a challenging structural topology. J Org Chem 2011; 76:7027-39. [PMID: 21819039 PMCID: PMC3163054 DOI: 10.1021/jo200936r] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Our struggles and ultimate success in achieving a total synthesis of phomactin A are described. Our strategy features an intramolecular oxa-[3 + 3] annulation to construct its unique ABD-tricyclic manifold. Although the synthesis would constitute a distinctly new approach with the 12-membered D-ring of phomactin A being assembled simultaneously with the 1-oxadecalin at an early stage, the ABD-tricycle represents a unique structural topology that would pose a number of unprecedented challenges. One challenge concerned elaborating this tricycle to have oxygenation at the proper carbon atoms. To overcome this, we would utilize a Kornblum-DeLaMare ring-opening of a peroxide bridge as well as a challenging late-stage 1,3-allylic alcohol transposition. Further, the structural intricacies of the ABD-tricycle were uncovered by a conformational analysis that would be critical for the C5a-homologation.
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Affiliation(s)
- Grant S. Buchanan
- Division of Pharmaceutical Sciences and Department of Chemistry University of Wisconsin, Madison, WI 53705
| | - Kevin P. Cole
- Chemical Product R&D, Eli Lilly and Company, Indianapolis, IN 46284
| | - Yu Tang
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, 300072 P. R. China
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry University of Wisconsin, Madison, WI 53705
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11
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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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12
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13
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De March P, Roca JL, Moreno-Mañas M, Pleixats R. The reactivity of 4-hydroxy-6-methyl-2-pyrone towards different types of ketones. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.5570210524] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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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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15
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Ghosh SK, Buchanan GS, Long QA, Wei Y, Al-Rashid ZF, Sklenicka HM, Hsung RP. Aza- and Carbo-[3 + 3] Annulations of Exo-Cyclic Vinylogous Amides and Urethanes. Synthesis of Tetrahydroindolizidines and An Unexpected Formation of Hexahydroquinolines. Tetrahedron 2008; 64:883-893. [PMID: 19180170 PMCID: PMC2330326 DOI: 10.1016/j.tet.2007.09.089] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
[3 + 3] Annulations of exo-cyclic vinylogous amides and urethanes with vinyl iminium salts are described here. We observed an intriguing dichotomy in their reaction pathways. For pyrrolidine- and azepane-based vinylogous amides or urethanes, aza-[3 + 3] annulation would dominate to give tetrahydroindolizidines, whereas, unexpectedly, for piperidine-based vinylogous amides or urethanes, carbo-[3 + 3] annulation was the pathway, leading to hexahydroquinolines. The origin for such a contrast is likely associated with a switch in the initial reaction pathway between C-1,2-addition and C-1,4-addition.
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Affiliation(s)
- Sunil K Ghosh
- Division of Pharmaceutical Sciences and Department of Chemistry, 777 Highland Avenue, Rennebohm Hall, University of Wisconsin Madison, WI 53705 USA
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16
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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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17
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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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18
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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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Cole KP, Hsung RP. Intramolecular formal oxa-[3 + 3] cycloaddition approach to the ABD system of phomactin A. Org Lett 2004; 5:4843-6. [PMID: 14653688 DOI: 10.1021/ol030115i] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ABD-ring of phomactin A was synthesized using an intramolecular formal oxa-[3 + 3] cycloaddion of an alpha,beta-unsaturated iminium salt tethered to a 1,3-diketone. This represents the first time that the 12-membered ring has been formed simultaneously with the 1-oxadecalin and should afford a facile route to the challenging structure of phomactin A. [reaction: see text]
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Affiliation(s)
- Kevin P Cole
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, MN 55455-0431, USA
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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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21
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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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Jonassohn M, Sterner O, Anke H. Structure-activity relationships for unsaturated dialdehydes 12. The reactivity of unsaturated dialdehydes towards triacetic acid lactone. Tetrahedron 1996. [DOI: 10.1016/0040-4020(95)00973-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Appendino G, Cravotto G, Nano GM, Palmisano G, Annunziata R. The Chemistry of Coumarin Derivatives. Part 5. Unusual course of the reaction of 4-hydroxycoumarin and aliphatic aldehydes. Helv Chim Acta 1993. [DOI: 10.1002/hlca.19930760306] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Moreno-Mañas M, Pleixats R. Dehydroacetic Acid, Triacetic Acid Lactone, and Related Pyrones. ADVANCES IN HETEROCYCLIC CHEMISTRY 1992. [DOI: 10.1016/s0065-2725(08)60861-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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27
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Kherfi HN, Hamdi M, Spéziale V. Réactivité des esters de la carboxyméthylène-1 hydroxy-4 méthyl-6 pyridone-2 vis-à-vis des aldéhydes aromatiques. J Heterocycl Chem 1990. [DOI: 10.1002/jhet.5570270540] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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28
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Cervello J, Marquet J, Moreno-Mañas M. Copper and cobalt mediated regioselective alkylation of polyketide models: methyl 3,5-dioxohexanoate and triacetic acid lactone. Tetrahedron 1990. [DOI: 10.1016/s0040-4020(01)89770-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Moreno-Mañas M, Papell E, Ribas J, Virgili A, Pleixats R. 4-Hydroxy-6-methyl-2-pyrone (triacetic acid lactone) and its 3-phenylthiomethyl derivative towards aldehydes in the presence of piperidine. J Heterocycl Chem 1986. [DOI: 10.1002/jhet.5570230220] [Citation(s) in RCA: 11] [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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