1
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Bera N, Samanta S, Sarkar D. Stereoselective Synthesis of Oxacycles via Ruthenium-Catalyzed Atom-Economic Coupling of Propargyl Alcohols and Michael Acceptors. J Org Chem 2021; 86:16369-16395. [PMID: 34735155 DOI: 10.1021/acs.joc.1c01758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Synthesis of β-hydroxyenones and its application toward development of tetrahydro-4H-pyran-4-one in an atom-economic fashion is limited. This manuscript describes a ruthenium-catalyzed atom-economic coupling of pent-2-yne-1,5-diols and Michael acceptors as an efficient route for the synthesis of β-hydroxyenones with excellent yields and high regioselectivity. The β-hydroxyenones further undergo a 6-endo trig cyclization under acid-catalyzed conditions to deliver the tetrahydro-4H-pyran-4-ones with high diastereoselectivity. An intramolecular aldol condensation under mild basic conditions and palladium-catalyzed oxidative aromatization was developed for the synthesis of hexahydro-6H-isochromen-6-ones and isochromanols, respectively, from highly substituted tetrahydro-4H-pyran-4-ones with excellent yield and diastereoselectivity. Overall, this work demonstrates the synthetic potential toward the synthesis of oxacycles like tetrahydro-4H-pyran-4-ones, hexahydro-6H-isochromen-6-ones, and isochromanols via an atom-economic catalysis.
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Affiliation(s)
- Nabakumar Bera
- Department of Chemistry, National Institute of Technology, Rourkela, Rourkela769008, India
| | - Shantanu Samanta
- Department of Chemistry, National Institute of Technology, Rourkela, Rourkela769008, India
| | - Debayan Sarkar
- Department of Chemistry, National Institute of Technology, Rourkela, Rourkela769008, India
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2
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Griggs SD, Thompson N, Tape DT, Fabre M, Clarke PA. Synthesis of highly substituted 2-spiropiperidines. Org Biomol Chem 2018; 16:6663-6674. [PMID: 30067258 DOI: 10.1039/c8ob01272e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2-Spiropiperidines are a highly desirable, yet under represented structure in drug discovery. 2-Spiropiperidines were synthesised in either a two-pot or one-pot reaction. In the two-pot reaction, the addition of a Weiler dianion to N-Boc imines, followed by deprotection and in situ condensation with a cyclic ketone generated functionalised 2-spiropiperidines in good to excellent yields. In the one-pot reaction, the addition of Chan's diene to N-Boc imines under Maitland-Japp conditions, followed by the addition of sodium bicarbonate and a cyclic ketone formed functionalised 2-spiropiperidines in moderate to good yields.
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Affiliation(s)
- Samuel D Griggs
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
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3
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Friedrich S, Hemmerling F, Lindner F, Warnke A, Wunderlich J, Berkhan G, Hahn F. Characterisation of the Broadly-Specific O-Methyl-transferase JerF from the Late Stages of Jerangolid Biosynthesis. Molecules 2016; 21:molecules21111443. [PMID: 27801873 PMCID: PMC6273487 DOI: 10.3390/molecules21111443] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 10/20/2016] [Accepted: 10/21/2016] [Indexed: 12/03/2022] Open
Abstract
We describe the characterisation of the O-methyltransferase JerF from the late stages of jerangolid biosynthesis. JerF is the first known example of an enzyme that catalyses the formation of a non-aromatic, cyclic methylenolether. The enzyme was overexpressed in E. coli and the cell-free extracts were used in bioconversion experiments. Chemical synthesis gave access to a series of substrate surrogates that covered a broad structural space. Enzymatic assays revealed a broad substrate tolerance and high regioselectivity of JerF, which makes it an attractive candidate for an application in chemoenzymatic synthesis with particular usefulness for late stage application on 4-methoxy-5,6-dihydro-2H-pyran-2-one-containing natural products.
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Affiliation(s)
- Steffen Friedrich
- Zentrum für Biomolekulare Wirkstoffe, Leibniz-Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany.
| | - Franziska Hemmerling
- Zentrum für Biomolekulare Wirkstoffe, Leibniz-Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany.
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Universitätsstraße 30, 95447 Bayreuth, Germany.
| | - Frederick Lindner
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Universitätsstraße 30, 95447 Bayreuth, Germany.
| | - Anna Warnke
- Zentrum für Biomolekulare Wirkstoffe, Leibniz-Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany.
| | - Johannes Wunderlich
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Universitätsstraße 30, 95447 Bayreuth, Germany.
| | - Gesche Berkhan
- Zentrum für Biomolekulare Wirkstoffe, Leibniz-Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany.
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Universitätsstraße 30, 95447 Bayreuth, Germany.
| | - Frank Hahn
- Zentrum für Biomolekulare Wirkstoffe, Leibniz-Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany.
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Universitätsstraße 30, 95447 Bayreuth, Germany.
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4
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Clarke PA, Nasir NM, Sellars PB, Peter AM, Lawson CA, Burroughs JL. Synthesis of 2,6-trans- and 3,3,6-trisubstituted tetrahydropyran-4-ones from Maitland-Japp derived 2H-dihydropyran-4-ones: a total synthesis of diospongin B. Org Biomol Chem 2016; 14:6840-52. [PMID: 27340028 DOI: 10.1039/c6ob01182a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
6-Substituted-2H-dihydropyran-4-one products of the Maitland-Japp reaction have been converted into tetrahydropyrans containing uncommon substitution patterns. Treatment of 6-substituted-2H-dihydropyran-4-ones with carbon nucleophiles led to the formation of tetrahydropyran rings with the 2,6-trans-stereochemical arrangement. Reaction of the same 6-substituted-2H-dihydropyran-4-ones with l-Selectride led to the formation of 3,6-disubstituted tetrahydropyran rings, while trapping of the intermediate enolate with carbon electrophiles in turn led to the formation 3,3,6-trisubstituted tetrahydropyran rings. The relative stereochemical configuration of the new substituents was controlled by the stereoelectronic preference for pseudo-axial addition of the nucleophile and trapping of the enolate from the opposite face. Application of these methods led to a synthesis of the potent anti-osteoporotic diarylheptanoid natural product diospongin B.
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Affiliation(s)
- Paul A Clarke
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, UK.
| | - Nadiah Mad Nasir
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, UK.
| | - Philip B Sellars
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, UK.
| | - Alejandra M Peter
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, UK.
| | - Connor A Lawson
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, UK.
| | - James L Burroughs
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, UK.
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5
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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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6
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Clarke PA, Sellars PB, Nasir NM. A Maitland-Japp inspired synthesis of dihydropyran-4-ones and their stereoselective conversion to functionalised tetrahydropyran-4-ones. Org Biomol Chem 2015; 13:4743-50. [PMID: 25804802 DOI: 10.1039/c5ob00292c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The Maitland-Japp reaction has been extended to the synthesis of highly functionalised dihydropyran-4-ones. These dihydropyran-4-ones can in turn be converted stereoselectively into tetrahydropyran-4-ones with tertiary and quaternary stereocentres via the one-pot addition of hydride or carbon nucleophiles and trapping with carbon electrophiles. The utility of this method is demonstrated by providing access to the functionalised tetrahydropyran units present in a component of the Civet fragrance and the anticancer polyketide lasonolide A.
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Affiliation(s)
- Paul A Clarke
- Department of Chemistry, University of York, Heslington, York, North Yorkshire YO10 5DD, UK.
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7
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Khodabakhshi S, Jafari F, Marahel F, Baghernejad M. One-pot, three-component synthesis of pyranocoumarins containing an aroyl group. HETEROCYCL COMMUN 2014. [DOI: 10.1515/hc-2014-0099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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8
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Harichandran G, Amalraj SD, Shanmugam P. A Facile and Efficient Solid Supported, One-Pot Synthesis of Functionalized Piperidine Derivatives Catalyzed by Amberlite IRA400-Cl Resin/I2/KI via Multicomponent Reaction. J Heterocycl Chem 2013. [DOI: 10.1002/jhet.1516] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gurusamy Harichandran
- Department of Polymer Science; University of Madras; Guindy Campus; Chennai; 600 025; India
| | | | - Ponnusamy Shanmugam
- Organic Chemistry Laboratory; Central Leather Research Institute; Adyar; Chennai; 600 020; India
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9
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Ghosh AK, Kass J, Nicponski DR, Keyes C. Diastereoselective Synthesis of Substituted Tetrahydropyrans by Copper(II)-Bisphosphine-Catalyzed Olefin Migration and Prins Cyclization. SYNTHESIS-STUTTGART 2012; 44:3579-3589. [PMID: 30449905 DOI: 10.1055/s-0032-1317495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We developed a copper(II) triflate-bisphosphine complex catalyzed olefin migration and Prins cyclization which lead to the synthesis of substituted tetrahydropyran derivatives. The protocol is convenient and a variety of substituted tetrahydropyrans were obtained in good to excellent yields with excellent diastereoselectivities.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Jorden Kass
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Daniel R Nicponski
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Chad Keyes
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
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10
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A short and convenient strategy for the synthesis of pyridazines via Diaza–Wittig reaction. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.09.059] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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Clarke PA, Ermanis K. Synthesis of the C20–C32 Tetrahydropyran Core of the Phorboxazoles and the C22 Epimer via a Stereodivergent Michael Reaction. Org Lett 2012; 14:5550-3. [DOI: 10.1021/ol3026523] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul A. Clarke
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Kristaps Ermanis
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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12
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Bondalapati S, Gogoi P, Indukuri K, Saikia AK. Diastereoselective Synthesis of Substituted Tetrahydrothiopyrans via (3,5)-Thionium–Ene Cyclization Reaction. J Org Chem 2012; 77:2508-12. [DOI: 10.1021/jo2023944] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Somasekhar Bondalapati
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Paramartha Gogoi
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Kiran Indukuri
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Anil K. Saikia
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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13
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Saha P, Bhunia A, Saikia AK. Synthesis of 2,3,5,6-tetrasubstituted tetrahydropyrans via (3,5)-oxonium-ene reaction. Org Biomol Chem 2012; 10:2470-81. [DOI: 10.1039/c2ob06832j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Ghosh AK, Nicponski DR. Cu(II)-catalyzed olefin migration and Prins cyclization: highly diastereoselective synthesis of substituted tetrahydropyrans. Org Lett 2011; 13:4328-31. [PMID: 21797234 DOI: 10.1021/ol2016675] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Metal-ligand complexes of Cu(OTf)(2) with an appropriate bisphosphine ligand have been shown to effectively catalyze the formation of substituted tetrahydropyrans via a sequential olefin migration and Prins-type cyclization. This methodology provides convenient access to a variety of functionalized tetrahydropyrans in excellent diastereoselectivities and good to excellent yields.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, USA.
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15
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Huang S, Du G, Lee CS. Construction of the Tricyclic Furanochroman Skeleton of Phomactin A via the Prins/Conia-Ene Cascade Cyclization Approach. J Org Chem 2011; 76:6534-41. [DOI: 10.1021/jo200644t] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shuangping Huang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen University Town, Xili, Shenzhen 518055, China
| | - Guangyan Du
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen University Town, Xili, Shenzhen 518055, China
| | - Chi-Sing Lee
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen University Town, Xili, Shenzhen 518055, China
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16
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Clarke PA, Sellars PB, Mistry N. Diastereoselective synthesis of functionalized 2-methyltetrahydropyran-4-ones. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.05.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Iqbal M, Mistry N, Clarke PA. An asymmetric Maitland–Japp reaction: a highly enantioselective synthesis of tetrahydropyran-4-ones. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.04.043] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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A new strategy for the synthesis of substituted dihydropyrones and tetrahydropyrones via palladium-catalyzed coupling of thioesters. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.03.114] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Tenenbaum JM, Morris WJ, Custar DW, Scheidt KA. Synthesis of (-)-okilactomycin by a Prins-type fragment-assembly strategy. Angew Chem Int Ed Engl 2011; 50:5892-5. [PMID: 21560215 DOI: 10.1002/anie.201102037] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Jason M Tenenbaum
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Chemistry of Life Processes Institute, Silverman Hall, Northwestern University, Evanston, IL 60208, USA
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20
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Tenenbaum JM, Morris WJ, Custar DW, Scheidt KA. Synthesis of (−)-Okilactomycin by a Prins-Type Fragment-Assembly Strategy. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Clarke PA, Santos S, Mistry N, Burroughs L, Humphries AC. The Asymmetric Maitland−Japp Reaction and Its Application to the Construction of the C1−C19 Bis-pyran Unit of Phorboxazole B. Org Lett 2011; 13:624-7. [DOI: 10.1021/ol102860r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul A. Clarke
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Soraia Santos
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Nimesh Mistry
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Laurence Burroughs
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Alexander C. Humphries
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
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22
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Saha P, Gogoi P, Saikia AK. Synthesis of oxabicyclo[3.3.1]nonenes and substituted tetrahydropyrans via (3,5)-oxonium-ene reaction. Org Biomol Chem 2011; 9:4626-34. [DOI: 10.1039/c1ob05172e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Synthetic studies on the phorboxazoles: a short synthesis of an epi-C23 tetrahydropyran core. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Reddy UC, Bondalapati S, Saikia AK. Stereoselective One-Pot, Three-Component Synthesis of 4-Aryltetrahydropyran via Prins−Friedel−Crafts Reaction. J Org Chem 2009; 74:2605-8. [PMID: 19216514 DOI: 10.1021/jo802531h] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- U. C. Reddy
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - S. Bondalapati
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Anil K. Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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25
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Clarke PA, Zaytsev AV, Morgan TW, Whitwood AC, Wilson C. One-Pot Synthesis of Functionalized Piperid-4-ones: A Four-Component Condensation. Org Lett 2008; 10:2877-80. [DOI: 10.1021/ol801051g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul A. Clarke
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, U.K., and School of Chemistry, University of Nottingham, University Park, Nottingham, Notts NG7 2RD, U.K
| | - Andrey V. Zaytsev
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, U.K., and School of Chemistry, University of Nottingham, University Park, Nottingham, Notts NG7 2RD, U.K
| | - Tyson W. Morgan
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, U.K., and School of Chemistry, University of Nottingham, University Park, Nottingham, Notts NG7 2RD, U.K
| | - Adrian C. Whitwood
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, U.K., and School of Chemistry, University of Nottingham, University Park, Nottingham, Notts NG7 2RD, U.K
| | - Claire Wilson
- Department of Chemistry, University of York, Heslington, York, North Yorks YO10 5DD, U.K., and School of Chemistry, University of Nottingham, University Park, Nottingham, Notts NG7 2RD, U.K
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26
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Synthesis of six-membered oxygenated heterocycles through carbon–oxygen bond-forming reactions. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.092] [Citation(s) in RCA: 212] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Clarke PA, Zaytzev AV, Whitwood AC. Pot, atom and step economic (PASE) synthesis of highly functionalized piperidines: a five-component condensation. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.141] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Reiter M, Turner H, Gouverneur V. Intramolecular Hetero-Michael Addition of β-Hydroxyenones for the Preparation of Highly Substituted Tetrahydropyranones. Chemistry 2006; 12:7190-203. [PMID: 16819725 DOI: 10.1002/chem.200600415] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Structurally diverse beta-hydroxyenones are shown to undergo nonoxidative 6-endo-trig ring closure to form highly substituted tetrahydropyranones. Amberlyst-15, Al(ClO(4))(3) x 9 H(2)O and [Pd(MeCN)(4)](BF(4))(2) were found to be suitable catalysts for these intramolecular conjugate additions, preventing side reactions, such as dehydration or retroaldolisation. The use of [Pd(MeCN)(4)](BF(4))(2) is particularly effective, as this palladium-mediated reaction is under kinetic control and generates tri- and tetrasubstituted tetrahydropyranones with high levels of diastereocontrol. In the presence of the Lewis acid Al(ClO(4))(3) x 9 H(2)O, the reaction proceeded with a similar level of diastereocontrol; however, in contrast to [Pd(MeCN)(4)](BF(4))(2), this catalyst can promote enolisation. The palladium-mediated reaction was also found to be compatible with an enantioenriched beta-hydroxyenone substrate, giving no loss of enantiopurity upon ring closure. The most distinctive synthetic development to emerge from this new chemistry is the possibility to access tri- and tetrasubstituted 2,6-anti-tetrahydropyranones from anti-aldol precursors. These compounds are particularly difficult to access by using alternative methodologies. Two modes of activation were envisaged for the ring closure, involving metal coordination to either the C=C or C=O functional groups. Experimental results suggest that C=O coordination was the preferred mode of activation for reactions performed in the presence of Al(ClO(4))(3) x 9 H(2)O or [Pd(MeCN)(4)](BF(4))(2).
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Affiliation(s)
- Maud Reiter
- University of Oxford, Chemistry Research Laboratory 12, Mansfield Road, Oxford OX1 3TA, UK
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Clarke PA, Santos S. Strategies for the Formation of Tetrahydropyran Rings in the Synthesis of Natural Products. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500964] [Citation(s) in RCA: 280] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Paul A. Clarke
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Address from January 1, 2006: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Soraia Santos
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Address from January 1, 2006: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
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