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Zimnitskiy NS, Denikaev AD, Barkov AY, Kutyashev IB, Korotaev VY, Sosnovskikh VY. Catalyst-free Tandem 1,3-Dipolar Cycloaddition/Aldol Condensation: Diastereoselective Construction of the Azatetraquinane Skeleton. J Org Chem 2020; 85:8683-8694. [PMID: 32517470 DOI: 10.1021/acs.joc.0c01127] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The one-pot regioselective and diastereoselective method for the synthesis of 5-(het)aroyl-7-(het)arylhexahydrobenzo[4,5]pentaleno[1,6a-b](thia)pyrrolizine-6,12-diones from accessible 1,5-di(het)arylpent-4-ene-1,3-diones or curcuminoids in 38-98% yield was developed. This reaction proceeds as a sequence of 1,3-dipolar cycloaddition of azomethine ylide generated in situ from ninhydrin and (thia)proline at the C═C bond of corresponding enedione, followed by spontaneous intramolecular aldol condensation and leads to the formation of an azatetraquinane scaffold.
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Affiliation(s)
- Nikolay S Zimnitskiy
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Andrey D Denikaev
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Alexey Y Barkov
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Igor B Kutyashev
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Vladislav Y Korotaev
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
| | - Vyacheslav Y Sosnovskikh
- Institute of Natural Sciences and Mathematics, Ural Federal University, pr. Lenina 51, 620000 Ekaterinburg, Russian Federation
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Kotha S, Kumar Chinnam A. Design of Aza-Polyquinanes via Fischer Indole Cyclization under Green Conditions. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)35] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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DTBB-catalysed lithiation of 1,2-bis(phenylsulfanyl)ethene: does 1-lithio-2-phenylsulfanylethene really exist? Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.07.056] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Paquette LA, Liu Z, Ramsey C, Gallucci JC. Competitive Stereochemical Control Operative during Conrotatory Electrocyclization of Helically Equilibrating Diquinanyl-Substituted 1,3,5,7-Octatetraenyl Bisenolates. J Org Chem 2005; 70:8154-61. [PMID: 16277342 DOI: 10.1021/jo0513919] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Carbohydrate structure: see text] Activation of the squarate ester cascade by adding the lithiated bicyclo[3.3.0]octene 20 and vinyllithium sequentially to 1 results in the isolation of the four tetracyclic products 21-24. The structures of the topographically complex products were deduced by 2D NMR spectroscopy and X-ray diffraction studies. The mechanistic insights gained by these findings are discussed. The product distribution is telltale evidence for predominant 1,2-addition of the second alkenyl anion. Product stereochemistry is in turn diagnostic of the preferred mode of conrotatory ring closure operating within equilibrating helical intermediates of opposite pitch. A competing pathway for the elimination of methanol in these highly functionalized intermediates has been observed for the first time.
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Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, Ohio State University, Columbus, Ohio 43210, USA.
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Paquette LA, Geng F. Applications of the squarate ester cascade to the expeditious synthesis of hypnophilin, coriolin, and ceratopicanol. J Am Chem Soc 2002; 124:9199-203. [PMID: 12149025 DOI: 10.1021/ja020474t] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first applications of the squarate ester cascade to natural products synthesis have been realized. Only 10 laboratory steps mediate the conversion of diisopropyl squarate to (+/-)-hypnophilin (8). Key reactions include a combination of chlorination, reduction, dehydration, and oxidation maneuvers in the proper sequence. A penultimate precursor to 8 has previously been converted into coriolin (9), thereby allowing a formal synthesis of racemic 9 also to be claimed. A rather different strategy was employed to arrive at (+/-)-ceratopicanol (10). Of the seven steps involved, three consisted of the use of lithium in liquid ammonia. The three divergent synthetic objectives realized in these experiments involved (a) generation of an extended enolate anion and its regioselective C-methylation at the gamma-carbon; (b) unprecedented reductive cleavage of a beta-isopropoxy group in a 2,3-diisopropoxy-2-cyclopentenone setting; and (c) conventional conversion of an alpha-alkoxy ketone to the parent carbonyl system. Thus, the appreciable enhancement in structural complexity offered by the squarate cascade holds considerable potential for the concise synthesis of constitutionally intricate targets.
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Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA.
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Geng F, Liu J, Paquette LA. Three-component coupling via the squarate ester cascade as a concise route to the bioactive triquinane sesquiterpene hypnophilin. Org Lett 2002; 4:71-3. [PMID: 11772093 DOI: 10.1021/ol0102388] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A squarate ester cascade is used to provide in one step, via the coupling of three reactants, a highly oxygenated linear triquinane product. The latter is transformed in nine steps into hypnophilin. The access route involves a combination of chlorination, reduction, dehydration, and oxidation maneuvers in the proper sequence.
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Affiliation(s)
- Feng Geng
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA
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7
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Affiliation(s)
- R Chinchilla
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain
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8
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Tae J, Paquette LA. Delineating the possibilities for intramolecular interception of the squarate ester cascade through the use of metalated enecarbamates. CAN J CHEM 2000. [DOI: 10.1139/v99-235] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Highly functionalized and annulated 2,4-cyclooctadienones are formed in a stereoselective manner by sequential treatment of squarate esters with a lithiated enecarbamate (six-membered ring or larger) and a cycloalkenyl- or 1-alkenyllithium reagent. The mechanistic details of this multistep process are presented. Particular attention is drawn to the step that involves intramolecular nucleophilic attack by a proximal oxido anion at the carbamate carbonyl and results in redirection of the cascade. This step is thwarted when five-membered cyclic enecarbamates are employed because of the excessive buildup of ring strain in the associated transition state.Key words: squarate esters, enecarbamates, conrotatory ring opening, intramolecular acylation, alkenyllithium reagents.
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9
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Biju P, Rao G. Aromatics to polyquinanes: A general method for the construction of tricyclo[6.3.0.04,8]-and tricyclo[6.3.0.02,6]undecanes. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)02026-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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MacDougall JM, Santora VJ, Verma SK, Turnbull P, Hernandez CR, Moore HW. Cyclobutenone-Based Syntheses of Polyquinanes and Bicyclo[6.3.0]undecanes by Tandem Anionic Oxy-Cope Reactions. Total Synthesis of (+/-)-Precapnelladiene. J Org Chem 1998; 63:6905-6913. [PMID: 11672312 DOI: 10.1021/jo980712w] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The addition of ethenyllithium derivatives to the carbonyl of dialkyl squarate-derived bicycloheptenones, e.g., 1a and 6a, initiates a low-temperature anion-accelerated oxy-Cope rearrangement to provide polyquinanes by a transannular aldol reaction of the intermediate bicyclo[6.3.0]undecadienone 4. Additional functionality is introduced by alkylation of the enolate 3 resulting from the oxy-Cope rearrangement. Phosphorylation or triflation of enolate 3 provides an entry into the bicyclo[6.3.0]undecane ring system. An application of this new methodology is demonstrated by the total synthesis of the sesquiterpene natural product (+/-)-precapnelladiene from diisopropyl squarate (10 steps, 12%).
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Affiliation(s)
- James M. MacDougall
- Department of Chemistry, University of California, Irvine, California 92697-2025
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Periasamy M, Rameshkumar C, Radhakrishnan U, Brunet JJ. New Convenient One-Pot Methods of Conversion of Alkynes to Cyclobutenediones or α,β-Unsaturated Carboxylic Acids Using Novel Reactive Iron Carbonyl Reagents. J Org Chem 1998. [DOI: 10.1021/jo971929d] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mariappan Periasamy
- School of Chemistry, University of Hyderabad, Central University P.O., Hyderabad 500 046, India, and Labratoire de Chimie de Coordination du CNRS, Unite No. 8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France
| | - Chellappan Rameshkumar
- School of Chemistry, University of Hyderabad, Central University P.O., Hyderabad 500 046, India, and Labratoire de Chimie de Coordination du CNRS, Unite No. 8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France
| | - Ukkiramapandian Radhakrishnan
- School of Chemistry, University of Hyderabad, Central University P.O., Hyderabad 500 046, India, and Labratoire de Chimie de Coordination du CNRS, Unite No. 8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France
| | - Jean-Jacques Brunet
- School of Chemistry, University of Hyderabad, Central University P.O., Hyderabad 500 046, India, and Labratoire de Chimie de Coordination du CNRS, Unite No. 8241, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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Paquette LA, Tae J. 1,5-Asymmetric Induction in Squarate Cascades. Conformational Control of Helicity by Chiral Amino Substituents during Conrotatory Octatetraene Cyclization Prior to β-Elimination. J Org Chem 1998. [DOI: 10.1021/jo9722921] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leo A. Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Jinsung Tae
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
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14
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Paquette LA, Kuo LH, Tae J. Evaluation of Amino Substituents as Nucleofugal Controllers of Regioselectivity and as Chelate Modulators of Stereoselectivity in Squarate Ester Cascades. J Org Chem 1998. [DOI: 10.1021/jo9722919] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leo A. Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Lung Huang Kuo
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Jinsung Tae
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
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Paquette LA, Kuo LH, Hamme AT, Kreuzholz R, Doyon J. Sensitivity of Substitution to the Extent of Self-Immolative Chirality Transfer during Reaction Cascades Originating from Squarate Esters. J Org Chem 1997. [DOI: 10.1021/jo962182e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leo A. Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Lung Huang Kuo
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Ashton T. Hamme
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Rüdiger Kreuzholz
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Julien Doyon
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
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