1
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Inverse hydride shuttle catalysis enables the stereoselective one-step synthesis of complex frameworks. Nat Chem 2022; 14:1306-1310. [PMID: 36266571 DOI: 10.1038/s41557-022-00991-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 06/01/2022] [Indexed: 11/09/2022]
Abstract
The rapid assembly of complex scaffolds in a single step from simple precursors identifies as an ideal reaction in terms of efficiency and sustainability. Indeed, the direct single-step synthesis of complex alkaloid frameworks remains an unresolved problem at the heart of organic chemistry in spite of the tremendous progress of the discipline. Herein, we present a broad strategy in which dynamically assembled ternary complexes are converted into valuable azabicyclic scaffolds based on the concept of inverse hydride shuttle catalysis. The ternary complexes are readily constructed in situ from three simple precursors and enable a highly modular installation of various substitution patterns. Upon subjection to a unique dual-catalytic system, the transient intermediates undergo an unusual hydride shuttle process that is initiated by a hydride donation event. Furthermore, we show that, in combination with asymmetric organocatalysis, the product alkaloid frameworks are obtained in excellent optical purity.
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2
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Kotha S, Keesari RR. A Modular Approach to Angularly Fused Polyquinanes via Ring-Rearrangement Metathesis: Synthetic Access to Cameroonanol Analogues and the Basic Core of Subergorgic Acid and Crinipellin. J Org Chem 2021; 86:17129-17155. [PMID: 34788028 DOI: 10.1021/acs.joc.1c02258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We describe a modular approach to angularly fused polyquinanes that are core units of many natural products such as cameroonanol, subergorgic acid, and crinepellin, etc. in excellent yields by employing atom-economic ring-rearrangement metathesis as a key step. Our work highlights, the synthesis of cameroonanol analogues 1-6 and their ester derivatives by using the stereoselective reduction of the carbonyl group by using DIBAL-H- and DCC-mediated coupling as the key reactions. The subergorgic acid core 7 was produced by LDA-mediated kinetically controlled regio- and stereoselective ring-junction allylation as a critical step. Moreover, it is worth mentioning that the present strategy relies on a less explored exo-dicyclopentadiene-1-one (8) and produces highly congested polycyclic frameworks containing up to seven contiguous stereogenic centers including quaternary carbons up to two. All of the new molecules were characterized by NMR data. The structure and relative stereochemistry of some compounds were confirmed by chemical methods and further supported by single-crystal X-ray diffraction studies. The newly reported tri- and tetraquinane skeletons are present in many naturally occurring bioactive polyquinanes. Hence, this strategy is useful for designing various "druglike molecules" and expands the chemical space of cyclopentanoids that are useful in medicinal chemistry.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India
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3
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George IR, López-Tena M, Sundin AP, Strand D. A Unifying Bioinspired Synthesis of (-)-Asperaculin A and (-)-Penifulvin D. Org Lett 2021; 23:3536-3540. [PMID: 33830776 PMCID: PMC8155558 DOI: 10.1021/acs.orglett.1c00955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The first syntheses
of the isomeric dioxafenestrene natural products
(−)-asperaculin A and (−)-penifulvin D are reported.
Each target is formed selectively by choice of oxidant in a final
divergent bioinspired Baeyer–Villiger (BV) reaction. Density
functional theory calculations reveal that electrostatic interactions
between the oxidant leaving group and the lactone motif accounts for
a reversal of selectivity with H2O2/H3O+ compared to peracids. Synthetic features include forging
the polycyclic carbon framework with a diastereoselective meta-photocycloaddition biased by an ether substituent at
the aryl α-position. The encumbered tertiary alcohol was installed
by cyanation of a ketone intermediate followed by nonaqueous hydrolysis
of the resulting delicate cyanohydrin.
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Affiliation(s)
- Ian R George
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Miguel López-Tena
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Anders P Sundin
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Daniel Strand
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
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4
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Zhang Z, Zhou YJ, Liang XW. Total synthesis of natural products using photocycloaddition reactions of arenes. Org Biomol Chem 2021; 18:5558-5566. [PMID: 32677654 DOI: 10.1039/d0ob01204a] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The photocycloaddition reaction of benzene with alkenes has become a significant approach for organic chemists and thus has been frequently utilized as a key step in the total synthesis of natural products. In this mini-review, the recent developments in [4 + 2] and [2 + 2] photocycloaddition reactions will be emphasized in constructing core scaffolds of complex natural products. By combining them together, we aim to demonstrate the utility and reinstate the importance of this methodology.
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Affiliation(s)
| | - Ying-Jun Zhou
- Xiang-Ya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China.
| | - Xiao-Wei Liang
- Xiang-Ya School of Pharmaceutical Sciences, Central South University, Changsha 410013, China.
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5
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Affiliation(s)
- Christian Ebner
- Eidgenössische Technische Hochschule Zürich, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
| | - Erick M. Carreira
- Eidgenössische Technische Hochschule Zürich, Vladimir-Prelog-Weg 3, 8093 Zürich, Switzerland
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6
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Le Bideau F, Kousara M, Chen L, Wei L, Dumas F. Tricyclic Sesquiterpenes from Marine Origin. Chem Rev 2017; 117:6110-6159. [DOI: 10.1021/acs.chemrev.6b00502] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Franck Le Bideau
- BioCIS,
Faculty of Pharmacy, Université Paris-Sud, CNRS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - Mohammad Kousara
- BioCIS,
Faculty of Pharmacy, Université Paris-Sud, CNRS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
- Faculty
of Pharmacy, Al Andalus University, P.O. Box 101, Tartus, Al Qadmus, Syria
| | - Li Chen
- BioCIS,
Faculty of Pharmacy, Université Paris-Sud, CNRS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - Lai Wei
- BioCIS,
Faculty of Pharmacy, Université Paris-Sud, CNRS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
| | - Françoise Dumas
- BioCIS,
Faculty of Pharmacy, Université Paris-Sud, CNRS, Université Paris-Saclay, 92290, Châtenay-Malabry, France
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7
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Kärkäs M, Porco JA, Stephenson CRJ. Photochemical Approaches to Complex Chemotypes: Applications in Natural Product Synthesis. Chem Rev 2016; 116:9683-747. [PMID: 27120289 PMCID: PMC5025835 DOI: 10.1021/acs.chemrev.5b00760] [Citation(s) in RCA: 674] [Impact Index Per Article: 84.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Indexed: 01/29/2023]
Abstract
The use of photochemical transformations is a powerful strategy that allows for the formation of a high degree of molecular complexity from relatively simple building blocks in a single step. A central feature of all light-promoted transformations is the involvement of electronically excited states, generated upon absorption of photons. This produces transient reactive intermediates and significantly alters the reactivity of a chemical compound. The input of energy provided by light thus offers a means to produce strained and unique target compounds that cannot be assembled using thermal protocols. This review aims at highlighting photochemical transformations as a tool for rapidly accessing structurally and stereochemically diverse scaffolds. Synthetic designs based on photochemical transformations have the potential to afford complex polycyclic carbon skeletons with impressive efficiency, which are of high value in total synthesis.
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Affiliation(s)
- Markus
D. Kärkäs
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - John A. Porco
- Department
of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Corey R. J. Stephenson
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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8
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Long R, Huang J, Gong J, Yang Z. Direct construction of vicinal all-carbon quaternary stereocenters in natural product synthesis. Nat Prod Rep 2015; 32:1584-601. [DOI: 10.1039/c5np00046g] [Citation(s) in RCA: 168] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Molecules containing vicinal all-carbon quaternary stereocenters are found in many secondary metabolites, and they exhibit a variety of biological and pharmacological activities.
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Affiliation(s)
- Rong Long
- Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Jun Huang
- Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Jianxian Gong
- Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055
- China
| | - Zhen Yang
- Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055
- China
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9
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Wender PA. Toward the ideal synthesis and molecular function through synthesis-informed design. Nat Prod Rep 2014; 31:433-40. [PMID: 24589860 DOI: 10.1039/c4np00013g] [Citation(s) in RCA: 165] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This Highlight describes factors that contribute to an ideal synthesis, including economies (step, time, atom, solvent, energy) and orientations (target, diversity, safety, function), and the role of synthesis-informed design directed at function in advancing synthesis and its impact on science.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, CA 94305, USA.
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10
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11
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Wender PA. Toward the Ideal Synthesis and Transformative Therapies: The Roles of Step Economy and Function Oriented Synthesis. Tetrahedron 2013; 69:7529-7550. [PMID: 23956471 PMCID: PMC3743450 DOI: 10.1016/j.tet.2013.06.004] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Paul A Wender
- Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, Stanford CA 94305-5080 USA
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12
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Hoffmann N. Photochemical reactions of aromatic compounds and the concept of the photon as a traceless reagent. Photochem Photobiol Sci 2013; 11:1613-41. [PMID: 22732723 DOI: 10.1039/c2pp25074h] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Electronic excitation significantly changes the reactivity of chemical compounds. Compared to ground state reactions, photochemical reactions considerably enlarge the application spectrum of a particular functional group in organic synthesis. Multistep syntheses may be simplified and perspectives for target oriented synthesis (TOS) and diversity oriented synthesis (DOS) are developed. New compound families become available or may be obtained more easily. In contrast to common chemical reagents, photons don't generate side products resulting from the transformation of a chemical reagent. Therefore, they are considered as a traceless reagent. Consequently, photochemical reactions play a central role in the methodology of sustainable chemistry. This aspect has been recognized since the beginning of the 20th century. As with many other photochemical transformations, photochemical reactions of aromatic, benzene-like compounds illustrate well the advantages in this context. Photochemical cycloadditions of aromatic compounds have been investigated for a long time. Currently, they are applied in various fields of organic synthesis. They are also studied in supramolecular structures. The phenomena of reactivity and stereoselectivity are investigated. During recent years, photochemical electron transfer mediated reactions are particularly focused. Such transformations have likewise been performed with aromatic compounds. Reactivity and selectivity as well as application to organic synthesis are studied.
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Affiliation(s)
- Norbert Hoffmann
- Institut de Chimie Moléculaire de Reims, UMR 7312 CNRS et Université de Reims Champagne-Ardenne, Equipe de Photochimie, UFR Sciences, B.P. 1039, F-51687 Reims, cedex 02, France.
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13
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Maurya HK, Pratap R, Kumar A, Kumar B, Huch V, Tandon VK, Ji Ram V. A carbanion induced ring switching synthesis of spiranes: an unprecedented approach. RSC Adv 2012. [DOI: 10.1039/c2ra21587j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Streit U, Bochet CG. The arene-alkene photocycloaddition. Beilstein J Org Chem 2011; 7:525-42. [PMID: 21647263 PMCID: PMC3107530 DOI: 10.3762/bjoc.7.61] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Accepted: 03/23/2011] [Indexed: 11/23/2022] Open
Abstract
In the presence of an alkene, three different modes of photocycloaddition with benzene derivatives can occur; the [2 + 2] or ortho, the [3 + 2] or meta, and the [4 + 2] or para photocycloaddition. This short review aims to demonstrate the synthetic power of these photocycloadditions.
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Affiliation(s)
- Ursula Streit
- Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland
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15
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Bach T, Hehn JP. Photochemical reactions as key steps in natural product synthesis. Angew Chem Int Ed Engl 2011; 50:1000-45. [PMID: 21246702 DOI: 10.1002/anie.201002845] [Citation(s) in RCA: 589] [Impact Index Per Article: 45.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Indexed: 12/15/2022]
Abstract
Photochemical reactions contribute in a significant way to the existing repertoire of carbon-carbon bond-forming reactions by allowing access to exceptional molecular structures that cannot be obtained by conventional means. In this Review, the most important photochemical transformations that have been employed in natural product synthesis are presented. Selected total syntheses are discussed as examples, with particular attention given to the photochemical key step and its stereoselectivity. The structural relationship between the photochemically generated molecule and the natural product is shown, and, where necessary, the consecutive reactions in the synthesis are illustrated and classified.
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Affiliation(s)
- Thorsten Bach
- Lehrstuhl für Organische Chemie I, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany.
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16
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Bach T, Hehn JP. Photochemische Reaktionen als Schlüsselschritte in der Naturstoffsynthese. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201002845] [Citation(s) in RCA: 177] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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17
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Gaich T, Mulzer J. From Silphinenes to Penifulvins: A Biomimetic Approach to Penifulvins B and C. Org Lett 2009; 12:272-5. [DOI: 10.1021/ol902594b] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tanja Gaich
- University of Vienna, Institute of Organic Chemistry, Währingerstrasse 38, A-1090 Vienna, Austria
| | - Johann Mulzer
- University of Vienna, Institute of Organic Chemistry, Währingerstrasse 38, A-1090 Vienna, Austria
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18
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Fillion E, Wilsily A, Fishlock D. Probing Persistent Intramolecular C−H···X (X = O, S, Br, Cl, and F) Bonding in Solution Using Benzyl Meldrum’s Acid Derivatives. J Org Chem 2008; 74:1259-67. [DOI: 10.1021/jo802311w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Eric Fillion
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Ashraf Wilsily
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Dan Fishlock
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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19
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Gaich T, Mulzer J. Total Synthesis of (−)-Penifulvin A, an Insecticide with a Dioxafenestrane Skeleton. J Am Chem Soc 2008; 131:452-3. [DOI: 10.1021/ja8083048] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tanja Gaich
- University of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, 1090 Wien, Austria
| | - Johann Mulzer
- University of Vienna, Institute of Organic Chemistry, Währinger Strasse 38, 1090 Wien, Austria
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20
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Tanaka A, Kawai T, Fujii M, Matsumoto T, Takabatake T, Okamoto H, Funatsu K. Molecular centrality for synthetic design of convergent reactions. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Development of Evaluation Model for Strategic Sites in Synthetic Route Design System AIPHOS. JOURNAL OF COMPUTER AIDED CHEMISTRY 2008. [DOI: 10.2751/jcac.9.81] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Chappell D, Russell AT. From alpha-cedrene to crinipellin B and onward: 25 years of the alkene-arene meta-photocycloaddition reaction in natural product synthesis. Org Biomol Chem 2006; 4:4409-30. [PMID: 17268633 DOI: 10.1039/b614011b] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Wender and Howbert's remarkable synthesis of alpha-cedrene in 1981 brought the attention of the synthetic community to the alkene-arene meta-photocycloaddition reaction. Here we review the natural product syntheses that have been achieved, over the last 25 years, utilising this strategic level reaction.
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Affiliation(s)
- David Chappell
- Department of Chemistry, University of Reading, Whiteknights, Reading, UK RG6 6AD
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23
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Wender PA, Croatt MP, Witulski B. New reactions and step economy: the total synthesis of (±)-salsolene oxide based on the type II transition metal-catalyzed intramolecular [4+4] cycloaddition. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.02.085] [Citation(s) in RCA: 185] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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24
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Palladium-mediated fragmentation of meta photocycloadducts using carbon based electrophiles. Part 1. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Wardrop DJ, Burge MS. Nitrenium ion azaspirocyclization-spirodienone cleavage: a new synthetic strategy for the stereocontrolled preparation of highly substituted lactams and N-hydroxy lactams. J Org Chem 2005; 70:10271-84. [PMID: 16323835 PMCID: PMC3308172 DOI: 10.1021/jo051252r] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Although 1,4-cyclohexadienes 2, obtained through the Birch reduction of arenes 1, have found widespread use as masked beta-oxo carbonyl synthons 3, the possibility that 2,5-cyclohexadienones 5 might also be employed to the same end has been overlooked despite their ready availability. As part of our ongoing investigation of the synthetic chemistry of nitrenium ions, we have developed a novel and efficient strategy for the stereoselective preparation of di- and trisubstituted azetidinone, pyrrolidinone, and piperidinone derivatives, which features the ozonolytic cleavage of azaspirocyclic 2,5-cyclohexadienones 12. For example, ozonolysis of spirodienone 12c in CH2Cl2 and reductive workup with dimethyl sulfide generated unstable beta-formyl ester 21, whereas cleavage in MeOH followed by reduction with thiourea led to hemiacetal 22. While both 21 and 22 partially decompose upon exposure to silica gel, they can be trapped in situ, with a variety of weakly basic nucleophiles, to usefully substituted products. The requisite spirodienone substrates are readily accessible through the nitrenium ion cyclization of alkyl omega-arylhydroxamates 10, which proceeds with moderate to high diastereoselectivity.
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Affiliation(s)
- Duncan J Wardrop
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607, USA.
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26
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Wardrop DJ, Burge MS, Zhang W, Ortı́z JA. π-Face selective azaspirocyclization of ω-(methoxyphenyl)-N-methoxyalkylamides. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00227-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Timmermans JL, Wamelink MP, Lodder G, Cornelisse J. Diastereoselective Intramolecular meta Photocycloaddition of Side-Chain-Substituted 5-(2-Methoxyphenyl)pent-1-enes. European J Org Chem 1999. [DOI: 10.1002/(sici)1099-0690(199902)1999:2<463::aid-ejoc463>3.0.co;2-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Singh V, Thomas B. Recent developments in general methodologies for the synthesis of linear triquinanest. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(97)10426-4] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Affiliation(s)
- Goverdhan Mehta
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
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31
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Miesch M, Miesch-Gross L, Franck-Neumann M. Total Synthesis of (±)-Silphinene: non photochemical cyclobutenic route to a crucial intermediate. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(96)01159-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Singh V, Porinchu M. Sigmatropic 1,2- and 1,3-acyl shifts in excited states: A novel, general protocol for the synthesis of tricyclopentanoids and protoilludanes. Tetrahedron 1996. [DOI: 10.1016/0040-4020(96)00329-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Coates RM, Ho Z, Zhu L. A Novel Cyclopropane Ring Fragmentation of Bicyclo[3.1.0]hexene Epoxides to 2,5-Dienals. J Org Chem 1996. [DOI: 10.1021/jo951850d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert M. Coates
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
| | - Zhanqi Ho
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
| | - Lijuan Zhu
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801
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34
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Meyer C, Marek I, Normant JF. Stereoselective synthesis of linear and angular triquinanes skeletons via the zinca-ene-allene reactions. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(95)02325-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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