1
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Masiuk US, Faletrov YV, Kananovich DG, Mineyeva IV. Stereodivergent Assembly of 2,6- cis- and - trans-Tetrahydropyrans via Base-Mediated Oxa-Michael Cyclization: The Key Role of the TMEDA Additive. J Org Chem 2023; 88:355-370. [PMID: 36495268 DOI: 10.1021/acs.joc.2c02382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The stereodivergent synthesis of cis- and trans-2,6-disubstituted tetrahydropyrans (THPs) via sodium hexamethyldisilazide-promoted oxa-Michael cyclization of (E)-ζ-hydroxy α,β-unsaturated esters is presented. The cyclization affords the kinetically favored trans-THPs with high stereoselectivity (dr up to 93:7) at a low temperature (-78 °C), while the room-temperature reaction does not produce the thermodynamically preferred cis-THPs as major products and occurs with poor stereocontrol. The addition of tetramethylethylenediamine (TMEDA) significantly improves the stereochemical outcome of the room-temperature cyclization and allows attaining high cis-selectivity (dr up to 99:1). The remarkable effect of TMEDA indicates that the sodium cation plays an important role in controlling the stereoselectivity of the thermodynamically driven process, that is, complexation of the cation with the cyclization products results in diminished selectivity. DFT calculations support this conclusion, indicating a greater difference in Gibbs energies of sodium-free cis- and trans-enolates compared to the respective sodium chelate complexes. The synthetic utility of the method has been demonstrated by the formal syntheses of (+)-Neopeltolide and (-)-Diospongin B and the total synthesis of (-)-Diospongin A.
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Affiliation(s)
- Uladzimir S Masiuk
- Department of Chemistry, Belarusian State University, Leningradskaya 14, 220006 Minsk, Belarus.,School of Science, Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Yaroslav V Faletrov
- Department of Chemistry, Belarusian State University, Leningradskaya 14, 220006 Minsk, Belarus.,Research Institute for Physical Chemical Problems, Belarusian State University, Leningradskaya 14, 220006 Minsk, Belarus
| | - Dzmitry G Kananovich
- School of Science, Department of Chemistry and Biotechnology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Iryna V Mineyeva
- Department of Chemistry, Belarusian State University, Leningradskaya 14, 220006 Minsk, Belarus
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2
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Wagner L, Stang J, Derra S, Hollmann T, Hahn F. Towards understanding oxygen heterocycle-forming biocatalysts: a selectivity study of the pyran synthase PedPS7. Org Biomol Chem 2022; 20:9645-9649. [PMID: 36412217 DOI: 10.1039/d2ob02064e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Intramolecular oxa-Michael addition-catalysing cyclases are widespread in polyketide biosynthetic pathways. Although they have significant potential in biotechnology and chemoenzymatic synthesis of chiral heterocycles, they have only scarcely been studied. Here, we present detailed investigations on the selectivity profile of the pyran synthase PedPS7 showing that it combines broad substrate tolerance with high selectivity for the formation of up to two new stereocentres and relaxed precursor stereoisomer discrimination. Two of the four possible tetrahydropyran stereoisomers are reliably accessible by this enzyme. The results indicate fundamental differences between the individual subtypes of intramolecular oxa-Michael addition-catalysing cyclases.
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Affiliation(s)
- Lisa Wagner
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, 95447 Bayreuth, Germany.
| | - Jörg Stang
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, 95447 Bayreuth, Germany.
| | - Sebastian Derra
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, 95447 Bayreuth, Germany.
| | - Tim Hollmann
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, 95447 Bayreuth, Germany.
| | - Frank Hahn
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, 95447 Bayreuth, Germany.
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3
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A simplified analog of debromoaplysiatoxin lacking the B-ring of spiroketal moiety retains protein kinase C-binding and antiproliferative activities. Bioorg Med Chem 2022; 73:116988. [DOI: 10.1016/j.bmc.2022.116988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 11/20/2022]
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4
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Alomari K, Sai Pavan Chakravarthy N, Duchadeau B, Ermanis K, Clarke PA. Enantioselective "clip-cycle" synthesis of di-, tri- and spiro-substituted tetrahydropyrans. Org Biomol Chem 2022; 20:1181-1185. [PMID: 35044408 DOI: 10.1039/d2ob00023g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ω-Unsaturated alcohols were "clipped" via alkene metathesis to a thioester activating group, which was followed by a chiral phosphoric acid catalyzed intramolecular oxa-Michael cyclization to yield tetrahydropyrans and spiro-tetrahydropyrans with excellent enantioselectivity. The mechanism and origin of the enantioselectivity was probed by DFT calculations and kinetic isotope studies, where there was excellent correlation between the computational and synthetic investigations.
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Affiliation(s)
- Khadra Alomari
- Department of Chemistry, University of York, Heslington, York, North Yorks, YO10 5DD, UK. .,Department of Chemistry, Faculty of Science, Jazan University, Saudi Arabia
| | | | - Bastien Duchadeau
- Department of Chemistry, University of York, Heslington, York, North Yorks, YO10 5DD, UK.
| | - Kristaps Ermanis
- Centre for Molecular Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
| | - Paul A Clarke
- Department of Chemistry, University of York, Heslington, York, North Yorks, YO10 5DD, UK.
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5
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Szpara R, Goyder A, Porter MJ, Hailes HC, Sheppard TD. Regioselective Dehydration of Sugar Thioacetals under Mild Conditions. Org Lett 2021; 23:2488-2492. [PMID: 33729808 PMCID: PMC8041386 DOI: 10.1021/acs.orglett.1c00424] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Sugars
are abundant in waste biomass, making them sustainable chiral
building blocks for organic synthesis. The demand for chiral saturated
heterocyclic rings for pharmaceutical applications is increasing as
they provide well-defined three-dimensional frameworks that show increased
metabolic resistance. A range of sugar thioacetals can be dehydrated
selectively at C-2 under mild basic conditions, and the resulting
ketene thioacetals can be applied to the production of useful chiral
building blocks via further selective dehydration reactions.
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Affiliation(s)
- Rachel Szpara
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Alexander Goyder
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Michael J Porter
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Helen C Hailes
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Tom D Sheppard
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
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6
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Vaithegi K, Prasad KR. Total synthesis of (+)-diospongin A. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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7
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Maddocks CJ, Ermanis K, Clarke PA. Asymmetric "Clip-Cycle" Synthesis of Pyrrolidines and Spiropyrrolidines. Org Lett 2020; 22:8116-8121. [PMID: 32991808 DOI: 10.1021/acs.orglett.0c03090] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The development of an asymmetric "clip-cycle" synthesis of 2,2- and 3,3-disubstituted pyrrolidines and spiropyrrolidines, which are increasingly important scaffolds in drug discovery programs, is reported. Cbz-protected bis-homoallylic amines were activated by "clipping" them to thioacrylate via an alkene metathesis reaction. Enantioselective intramolecular aza-Michael cyclization onto the activated alkene, catalyzed by a chiral phosphoric acid, formed a pyrrolidine. The reaction accommodated a range of substitutions to form 2,2- and 3,3-disubstituted pyrrolidines and spiropyrrolidines with high enantioselectivities. The importance of the thioester activating group was demonstrated by comparison to ketone and oxoester-containing substrates. DFT studies supported the aza-Michael cyclization as the rate- and stereochemistry-determining step and correctly predicted the formation of the major enantiomer. The catalytic asymmetric syntheses of N-methylpyrrolidine alkaloids (R)-irnidine and (R)-bgugaine, which possess DNA binding and antibacterial properties, were achieved using the "clip-cycle" methodology.
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Affiliation(s)
- Christopher J Maddocks
- Department of Chemistry, University of York, Heslington, York, North Yorks, U.K., YO10 5DD
| | - Kristaps Ermanis
- Centre for Molecular Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, U.K., CB2 1EW
| | - Paul A Clarke
- Department of Chemistry, University of York, Heslington, York, North Yorks, U.K., YO10 5DD
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8
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Hollmann T, Berkhan G, Wagner L, Sung KH, Kolb S, Geise H, Hahn F. Biocatalysts from Biosynthetic Pathways: Enabling Stereoselective, Enzymatic Cycloether Formation on a Gram Scale. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05071] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Tim Hollmann
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Gesche Berkhan
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
- Centre for Biomolecular Drug Research, Leibniz Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany
| | - Lisa Wagner
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Kwang Hoon Sung
- Helmholtz-Zentrum für Infektionsforschung GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany
- Institute of Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig, Spielmannstrasse 7, 38106 Braunschweig, Germany
- Protein Facility, ILAb Co., Ltd. NP513, The Catholic University of Korea, 420-743 Bucheon, Republic of Korea
| | - Simon Kolb
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
| | - Hendrik Geise
- Centre for Biomolecular Drug Research, Leibniz Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany
| | - Frank Hahn
- Professur für Organische Chemie (Lebensmittelchemie), Fakultät für Biologie, Chemie und Geowissenschaften, Department of Chemistry, Universität Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
- Centre for Biomolecular Drug Research, Leibniz Universität Hannover, Schneiderberg 38, 30167 Hannover, Germany
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9
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Zhao Y, Guo X, Wang Z, Shen D, Chen T, Wu N, Yan S, You J. TBAF-Catalyzed Cyclization Reactions of o
-(Alkynyl)phenyl Propargyl Alcohols with Malonate Esters: A Possible Cation-π Interaction as The Activation Approach. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yulei Zhao
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Xuqiang Guo
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Zongkang Wang
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Duyi Shen
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Tingting Chen
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Nan Wu
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Shina Yan
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
| | - Jinmao You
- School of Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu China
- Northwest Institute of Plateau Biology; Chinese Academy of Science; 810001 Xining China
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10
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Csókás D, Ho AXY, Ramabhadran RO, Bates RW. How an early or late transition state impacts the stereoselectivity of tetrahydropyran formation by intramolecular oxa-Michael addition. Org Biomol Chem 2019; 17:6293-6304. [PMID: 31204752 DOI: 10.1039/c9ob00750d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intramolecular oxa-Michael addition giving tetrahydropyrans has been examined experimentally using both acidic and basic catalysis. With acidic catalysis, the diequatorial product is exclusively obtained in a kinetically controlled reaction in all cases. Under basic conditions at low temperature, the reaction is again under kinetic control, but formation of the axial-equatorial isomer is generally favoured with an (E)-Michael acceptor, although isomerisation to the diequatorial isomer is observed at higher temperatures. Computationally, it is found that the acid catalysed reaction has a late transition state and the kinetic favouring of the diequatorial isomer has a steric explanation. In contrast, under strongly basic conditions, an early transition state is found. Electrostatic effects are likely to be the main contributor to the stereoselectivity for the (E)-isomer and steric interactions for the (Z)-isomer.
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Affiliation(s)
- Dániel Csókás
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
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11
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Zhao Y, Zhang Z, Liu X, Wang Z, Cao Z, Tian L, Yue M, You J. TBAF-Catalyzed O-Nucleophilic Cyclization of Enaminones: A Process for the Synthesis of Dihydroisobenzofuran Derivatives. J Org Chem 2019; 84:1379-1386. [DOI: 10.1021/acs.joc.8b02842] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yulei Zhao
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Zheng Zhang
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Xu Liu
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Zongkang Wang
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Ziping Cao
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Laijin Tian
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Mingbo Yue
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
| | - Jinmao You
- Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, 273165, China
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, 810001, China
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12
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Srinivas B, Reddy DS, Mallampudi NA, Mohapatra DK. A General Diastereoselective Strategy for Both cis- and trans-2,6-Disubstituted Tetrahydropyrans: Formal Total Synthesis of (+)-Muconin. Org Lett 2018; 20:6910-6914. [PMID: 30354147 DOI: 10.1021/acs.orglett.8b03053] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A protocol for general diastereoselective tandem dihydroxylation followed by SN2 cyclization was developed for the convenient and efficient synthesis of cis- and trans-2,6-disubstituted tetrahydropyrans from ζ-mesyloxy α,β-unsaturated esters. The application of this novel method was demonstrated through the concise formal synthesis of (+)-muconin, a nonclassical acetogenin, with sequential THP-THF ring formation.
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Affiliation(s)
- Beduru Srinivas
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007 , India
| | - D Srinivas Reddy
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007 , India
| | - N Arjunreddy Mallampudi
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007 , India
| | - Debendra K Mohapatra
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500 007 , India
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