1
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Ahlburg NL, Hergert O, Jones PG, Werz DB. Donor-Acceptor Cyclopropanes: Activation Enabled by a Single, Vinylogous Acceptor. Angew Chem Int Ed Engl 2023; 62:e202214390. [PMID: 36322458 PMCID: PMC10099577 DOI: 10.1002/anie.202214390] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Indexed: 11/05/2022]
Abstract
A novel class of highly activated donor-acceptor cyclopropanes bearing only a single, vinylogous acceptor is presented. These strained moieties readily undergo cycloadditions with aldehydes, ketones, thioketones, nitriles, naphth-2-ols and various other substrates to yield the corresponding carbo- and heterocycles. Diastereocontrol can be achieved through the choice of catalyst (Brønsted or Lewis acid). The formation of tetrahydrofurans was shown to be highly enantiospecific when chiral cyclopropanes are employed. A series of mechanistic and kinetic experiments was conducted to elucidate a plausible catalytic cycle and to rationalize the stereochemical outcome.
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Affiliation(s)
- Nils L. Ahlburg
- Technische Universität BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
| | - Oliver Hergert
- Technische Universität BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
| | - Peter G. Jones
- Technische Universität BraunschweigInstitute of Inorganic and Analytical ChemistryHagenring 3038106BraunschweigGermany
| | - Daniel B. Werz
- Albert-Ludwigs-Universität FreiburgInstitute of Organic ChemistryAlbertstraße 2179104Freiburg (Breisgau)Germany
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2
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Ahlburg NL, Hergert O, Jones PG, Werz DB. Donor‐Acceptor Cyclopropanes: Activation Enabled by a Single, Vinylogous Acceptor. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202214390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Affiliation(s)
- Nils L. Ahlburg
- Technische Universität Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Oliver Hergert
- Technische Universität Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Peter G. Jones
- Technische Universität Braunschweig Institute of Inorganic and Analytical Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Daniel B. Werz
- Albert-Ludwigs-Universität Freiburg Institute of Organic Chemistry Albertstraße 21 79104 Freiburg (Breisgau) Germany
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3
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Gontala A, Woo SK. Visible‐Light Photoredox‐Catalyzed α‐Regioselective Conjugate Addition of Allyl Groups to Activated Alkenes. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000445] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Arjun Gontala
- Department of ChemistryUniversity of Ulsan 93 Daehak-Ro, Nam-Gu Ulsan 44610 Korea
| | - Sang Kook Woo
- Department of ChemistryUniversity of Ulsan 93 Daehak-Ro, Nam-Gu Ulsan 44610 Korea
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4
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Liang MZ, Meek SJ. Synthesis of Quaternary Carbon Stereogenic Centers by Diastereoselective Conjugate Addition of Boron-Stabilized Allylic Nucleophiles to Enones. J Am Chem Soc 2020; 142:9925-9931. [PMID: 32408746 DOI: 10.1021/jacs.0c03900] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A method for the site-selective and diastereoselective conjugate addition of boron-stabilized allylic nucleophiles to α,β-unsaturated ketones is disclosed. Transformations involve easily prepared γ,γ-disubstituted allyldiboron reagents and proceed in the presence of a fluoride activator at 80 °C. Reactions proceed with a wide variety of enones and allyldiboron reagents efficiently to deliver ketone products that contain otherwise difficult-to-access vicinal β-tertiary and γ-quaternary carbon stereogenic centers and an alkenylboron moiety. The utility of the method is highlighted by several transformations, including cross-coupling and carbocyclizations.
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Affiliation(s)
- Michael Z Liang
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Simon J Meek
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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5
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Tang Q, Fu K, Ruan P, Dong S, Su Z, Liu X, Feng X. Asymmetric Catalytic Formal 1,4‐Allylation of β,γ‐Unsaturated α‐Ketoesters: Allylboration/Oxy‐Cope Rearrangement. Angew Chem Int Ed Engl 2019; 58:11846-11851. [DOI: 10.1002/anie.201905533] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 06/07/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Qiong Tang
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Kai Fu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Peiran Ruan
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Zhishan Su
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
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6
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Tang Q, Fu K, Ruan P, Dong S, Su Z, Liu X, Feng X. Asymmetric Catalytic Formal 1,4‐Allylation of β,γ‐Unsaturated α‐Ketoesters: Allylboration/Oxy‐Cope Rearrangement. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905533] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Qiong Tang
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Kai Fu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Peiran Ruan
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Zhishan Su
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
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7
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Wang X, Li J, Yuan T, You B, Xie G, Lv X. Additive Tuned Selective Synthesis of Bicyclo[3.3.0]octan-1-ols and Bicyclo[3.1.0]hexan-1-ols Mediated by AllylSmBr. J Org Chem 2018; 83:8984-8994. [PMID: 29944369 DOI: 10.1021/acs.joc.8b01170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The selective construction of bicyclo[3.3.0]octan-1-ols and bicyclo[3.1.0]hexan-1-ols was achieved by using an allylSmBr/additive(s) system. By employing HMPA as the only additive, the momoallylation/ketone-alkene coupling occurred preferably and afforded bicyclo[3.3.0]octan-1-ols in good yields with high diastereoselectivities. While the ester-alkene coupling predominated to generate bicyclo[3.1.0]hexan-1-ols in moderate yields with excellent diastereoselectivities in the presence of a proton source, such as pyrrole as the coadditive with HMPA. The tunable reactivity of allylSmBr by additive(s) would make it a versatile reagent in organic synthesis.
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Affiliation(s)
- Xiaoxia Wang
- School of Environment and Civil Engineering , Dongguan University of Technology , Dongguan , 523808 , People's Republic of China.,College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua 321004 , People's Republic of China
| | - Jianyong Li
- College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua 321004 , People's Republic of China
| | - Ting Yuan
- College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua 321004 , People's Republic of China
| | - Bingxin You
- College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua 321004 , People's Republic of China
| | - Guanqun Xie
- School of Environment and Civil Engineering , Dongguan University of Technology , Dongguan , 523808 , People's Republic of China.,College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua 321004 , People's Republic of China
| | - Xin Lv
- College of Chemistry and Life Sciences , Zhejiang Normal University , Jinhua 321004 , People's Republic of China
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8
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Gervais A, Lazarski KE, Porco JA. Divergent Total Syntheses of Rhodomyrtosones A and B. J Org Chem 2016; 80:9584-91. [PMID: 26351970 DOI: 10.1021/acs.joc.5b01570] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Herein, we report total syntheses of the tetramethyldihydroxanthene natural product rhodomyrtosone B and the related bis-furan β-triketone natural product rhodomyrtosone A. Nickel-(II)-catalyzed 1,4-conjugate addition of an α-alkylidene-β-dicarbonyl substrate was developed to access the congener rhodomyrtosone B, and oxygenation of the same monoalkylidene derivative followed by cyclization was employed to obtain the bis-furan natural product rhodomyrtosone A.
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Affiliation(s)
- Anais Gervais
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Kiel E Lazarski
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - John A Porco
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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9
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Jia Z, Wang K, Li T, Tan B, Gu Y. Functionalized hypercrosslinked polymers with knitted N-heterocyclic carbene–copper complexes as efficient and recyclable catalysts for organic transformations. Catal Sci Technol 2016. [DOI: 10.1039/c5cy02260f] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An N-heterocyclic carbene–copper complex supported on hypercrosslinked polymers was synthesized and characterized by spectroscopic methods, displaying very good catalytic activity in many organic reactions.
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Affiliation(s)
- Zhifang Jia
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- China
| | - Kewei Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- China
| | - Tao Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- China
| | - Bien Tan
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- China
| | - Yanlong Gu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan
- China
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10
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Berini C, Sebban M, Oulyadi H, Sanselme M, Levacher V, Brière JF. Organocatalyzed Multicomponent Synthesis of Isoxazolidin-5-ones. Org Lett 2015; 17:5408-11. [DOI: 10.1021/acs.orglett.5b02755] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Christophe Berini
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Muriel Sebban
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Hassan Oulyadi
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Morgane Sanselme
- Normandie Univ, Laboratoire SMS- EA3233, Univ Rouen, F-76821, Mont Saint Aignan, France
| | - Vincent Levacher
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Jean-François Brière
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
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11
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Ahmar S, Fillion E. Expedient Synthesis of Complex γ-Butyrolactones from 5-(1-Arylalkylidene) Meldrum’s Acids via Sequential Conjugate Alkynylation/Ag(I)-Catalyzed Lactonization. Org Lett 2014; 16:5748-51. [DOI: 10.1021/ol502811j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Siawash Ahmar
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Eric Fillion
- Department
of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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12
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Janikowska K, Rachoń J, Makowiec S. Acyl Meldrum's acid derivatives: application in organic synthesis. RUSSIAN CHEMICAL REVIEWS 2014. [DOI: 10.1070/rc2014v083n07abeh004441] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Zhao LM, Zhang SQ, Dou F, Sun R. Zinc-mediated highly α-regioselective 1,4-addition of chalcones with prenyl bromide in THF. Org Lett 2013; 15:5154-7. [PMID: 24090191 DOI: 10.1021/ol402000m] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
α-Regioselective addition to chalcones was realized by use of in situ generated prenylzinc reagents from zinc and prenyl bromide in the presence of SnCl4 in a 1,4-addition fashion. The approach uses the reagent combination of prenyl bromide, zinc, and SnCl4 in THF, all of which are inexpensive, readily available, and easily removable after the reaction.
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Affiliation(s)
- Li-Ming Zhao
- School of Chemistry and Chemical Engineering, and Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University , Xuzhou 221116, Jiangsu, China
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14
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Armstrong EL, Grover HK, Kerr MA. Scandium Triflate-Catalyzed Nucleophilic Additions to Indolylmethyl Meldrum’s Acid Derivatives via a Gramine-Type Fragmentation: Synthesis of Substituted Indolemethanes. J Org Chem 2013; 78:10534-40. [DOI: 10.1021/jo4017524] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erin L. Armstrong
- Department
of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Huck K. Grover
- Department
of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Michael A. Kerr
- Department
of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
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15
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Cao Y, Zhang SC, Zhang M, Shen GB, Zhu XQ. Determination of Thermodynamic Affinities of Various Polar Olefins as Hydride, Hydrogen Atom, and Electron Acceptors in Acetonitrile. J Org Chem 2013; 78:7154-68. [DOI: 10.1021/jo4010926] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Ying Cao
- The State Key Laboratory of Elemento-Organic Chemistry,
Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Song-Chen Zhang
- The State Key Laboratory of Elemento-Organic Chemistry,
Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Min Zhang
- The State Key Laboratory of Elemento-Organic Chemistry,
Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Guang-Bin Shen
- The State Key Laboratory of Elemento-Organic Chemistry,
Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiao-Qing Zhu
- The State Key Laboratory of Elemento-Organic Chemistry,
Department of Chemistry, Nankai University, Tianjin 300071, China
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16
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Asymmetric total syntheses of xanthatin and 11,13-dihydroxanthatin using a stereocontrolled conjugate allylation to γ-butenolide. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.11.077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Yamamoto Y, Yamada S, Nishiyama H. Copper-Catalyzed Regio- and Stereoselective Conjugate Allylation of Electron-Deficient Alkynes with Allylboronates under Mild Conditions. Chemistry 2012; 18:3153-6. [DOI: 10.1002/chem.201103697] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Indexed: 12/28/2022]
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19
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Fallan C, Quigley PF, Lam HW. Ytterbium-catalyzed conjugate allylation of alkylidene malonates. J Org Chem 2011; 76:4112-8. [PMID: 21524084 DOI: 10.1021/jo200268e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alkylidene malonates undergo efficient conjugate allylation upon treatment with allylstannanes or allylsilanes under the action of ytterbium catalysis.
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Affiliation(s)
- Charlene Fallan
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, The King's Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
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20
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Woo JC, Cui S, Walker SD, Faul MM. Asymmetric syntheses of a GPR40 receptor agonist via diastereoselective and enantioselective conjugate alkynylation. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Dumas AM, Fillion E. Meldrum's acids and 5-alkylidene Meldrum's acids in catalytic carbon-carbon bond-forming processes. Acc Chem Res 2010; 43:440-54. [PMID: 20000793 DOI: 10.1021/ar900229z] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Meldrum's acid (2,2-dimethyl-1,3-dioxane-4,6-dione) is a molecule with a unique history, owing to its originally misassigned structure, as well as a unique place among acylating agents, owing to its high acidity and remarkable electrophilicity. In this Account, we outline the work of our group and others toward harnessing the reactivity of Meldrum's acid derivatives in catalytic C-C bond-forming reactions. Taking advantage of the ability of Meldrum's acid to decompose to CO(2) and acetone following acyl substitution, we have shown that intramolecular Friedel-Crafts acylations can be performed under mild Lewis acidic conditions to yield a variety of benzocyclic ketones. In a further expansion of this method, a domino Friedel-Crafts acylation/alpha-tert alkylation reaction was used to complete the first total synthesis of (+/-)-taiwaniaquinol B. The unique characteristics of Meldrum's acid extend to its alkylidene derivatives, which have also proven exceptionally useful for the development of new reactions not readily accessible from other unsaturated carbonyl electrophiles. By combining the electrophilicity and dienophilicity of alkylidene Meldrum's acid with our Friedel-Crafts chemistry, we have demonstrated new domino syntheses of coumarin derivatives and tetrahydrofluorenones by conjugate additions, Diels-Alder cycloadditions, and C-H functionalizations. Additionally, we have used these powerful acceptors to allow conjugate alkenylation with functionalized organostannanes, and conjugate allylation under very mild conditions. We have also shown that these molecules permit the asymmetric formation of all-carbon quaternary stereocenters via enantioselective conjugate additions. These reactions employ dialkylzinc nucleophiles, maximizing functional group compatibility, while the presence of a Meldrum's acid moiety in the product allows a variety of postaddition modifications. A full investigation of this reaction has determined the structural factors of the alkylidene that contribute to optimal enantioselectivity. We have also used these acceptors to form tertiary propargylic stereocenters in very high enantiomeric excess by an extremely mild, Rh(I)-catalyzed addition of TMS-acetylene. Overall, we demonstrate that Meldrum's acid and its derivatives provide access to a broad range of reactivities that, combined with their ease of handling and preparation, make them ideal electrophiles.
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Affiliation(s)
- Aaron M. Dumas
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Eric Fillion
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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22
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Mahoney SJ, Dumas AM, Fillion E. Asymmetric Addition of Alkenylstannanes to Alkylidene Meldrum’s Acids. Org Lett 2009; 11:5346-9. [DOI: 10.1021/ol902216y] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stuart J. Mahoney
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Aaron M. Dumas
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Eric Fillion
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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23
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Wilsily A, Nguyen Y, Fillion E. Hydrogenolysis of Unstrained Carbon−Carbon σ Bonds: Stereoselective Entry into Benzylic Tertiary Centers. J Am Chem Soc 2009; 131:15606-7. [DOI: 10.1021/ja9076815] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Ashraf Wilsily
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
| | - Yen Nguyen
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
| | - Eric Fillion
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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24
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Fillion E, Zorzitto AK. Enantioselective Rhodium-Catalyzed Conjugate Alkynylation of 5-Benzylidene Meldrum’s Acids with TMS-acetylene. J Am Chem Soc 2009; 131:14608-9. [DOI: 10.1021/ja905336p] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eric Fillion
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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25
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Functionalization of Csp3–H bond—Sc(OTf)3-catalyzed domino 1,5-hydride shift/cyclization/Friedel–Crafts acylation reaction of benzylidene Meldrum’s acids. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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