1
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Zheng Z, Deiana L, Posevins D, Rafi AA, Zhang K, Johansson MJ, Tai CW, Córdova A, Bäckvall JE. Efficient Heterogeneous Copper-Catalyzed Alder-Ene Reaction of Allenynamides to Pyrrolines. ACS Catal 2022; 12:1791-1796. [PMID: 35154848 PMCID: PMC8822631 DOI: 10.1021/acscatal.1c05147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 01/11/2022] [Indexed: 12/18/2022]
Abstract
Herein, we describe an efficient nanocopper-catalyzed Alder-ene reaction of allenynamides. The copper nanoparticles were immobilized on amino-functionalized microcrystalline cellulose. A solvent-controlled chemoselectivity of the reaction was observed, leading to the chemodivergent synthesis of pyrrolines (2,5-dihydropyrroles) and pyrroles. The heterogeneous copper catalyst exhibits high efficiency and good recyclability in the Alder-ene reaction, constituting a highly attractive catalytic system from an economical and environmental point of view.
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Affiliation(s)
- Zhiyao Zheng
- Department
of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Luca Deiana
- Department
of Natural Sciences, Holmgatan 10, Mid Sweden
University, 85179 Sundsvall, Sweden
| | - Daniels Posevins
- Department
of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Abdolrahim A. Rafi
- Department
of Natural Sciences, Holmgatan 10, Mid Sweden
University, 85179 Sundsvall, Sweden
| | - Kaiheng Zhang
- Department
of Natural Sciences, Holmgatan 10, Mid Sweden
University, 85179 Sundsvall, Sweden
| | - Magnus J. Johansson
- AstraZeneca
R&D, Innovative Medicines, Cardiovascular
and Metabolic Disorders, Medicinal Chemistry, Pepparedsleden 1, SE-431 83 Mölndal, Sweden
| | - Cheuk-Wai Tai
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
| | - Armando Córdova
- Department
of Natural Sciences, Holmgatan 10, Mid Sweden
University, 85179 Sundsvall, Sweden
| | - Jan-E. Bäckvall
- Department
of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
- Department
of Natural Sciences, Holmgatan 10, Mid Sweden
University, 85179 Sundsvall, Sweden
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2
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Joyce LM, Drew MA, Tague AJ, Thaima T, Gouranourimi A, Ariafard A, Pyne SG, Hyland C. A Rare Alder-ene Cycloisomerisation of 1,6-Allenynes. Chemistry 2021; 28:e202104022. [PMID: 34971450 DOI: 10.1002/chem.202104022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Indexed: 11/06/2022]
Abstract
Thermally induced cycloisomerization reactions of 1,6-allenynes gives α-methylene-γ-lactams via intramolecular Alder-ene reactions. The mechanism is supported by computational and deuterium labeling studies. This thermal, non-radical method enables the discovery of a hitherto unknown route that proceeds via a divergent mechanism distinct from the previous [2+2] cycloisomerization manifold.
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Affiliation(s)
- Liam M Joyce
- University of Wollongong Faculty of Science: University of Wollongong Faculty of Science Medicine and Health, Chemistry, AUSTRALIA
| | - Melanie A Drew
- University of Wollongong Faculty of Science: University of Wollongong Faculty of Science Medicine and Health, chemistry, AUSTRALIA
| | - Andrew J Tague
- University of Wollongong Faculty of Science: University of Wollongong Faculty of Science Medicine and Health, Chemistry, AUSTRALIA
| | - Thanaphat Thaima
- University of Wollongong Faculty of Science: University of Wollongong Faculty of Science Medicine and Health, chemistry, AUSTRALIA
| | | | | | - Stephen G Pyne
- University of Wollongong Faculty of Science: University of Wollongong Faculty of Science Medicine and Health, Chemistry, AUSTRALIA
| | - Christopher Hyland
- University of Wollongong, School of Chemistry, Northfields Avenue, 2522, Wollongong, AUSTRALIA
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3
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Yadav S, Ramasastry SSV. Palladium-Catalyzed Intramolecular Alder-Ene Type Cycloisomerization Reactions. Chem Asian J 2020; 15:2764-2774. [PMID: 32667724 DOI: 10.1002/asia.202000683] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/14/2020] [Indexed: 02/06/2023]
Abstract
An overview of the recent literature on palladium-catalyzed intramolecular Alder-ene (IMAE) reaction of a variety of 1,n-unsaturated systems is presented. The reaction which was first reported by Trost and Lautens provided an efficient alternative to the thermal or Lewis acid catalyzed cycloisomerizations involving ene-type reaction. The IMAE cyclization of enynes and dienes has emerged as an important area and found significant applications in building up of complex molecular architectures and in the synthesis of several bioactive natural products. Since highly impactful reviews on this subject have covered the literature till 2015, this article focuses on summarizing the works subsequent to 2015.
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Affiliation(s)
- Sonu Yadav
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli PO, Punjab, 140306, India
| | - S S V Ramasastry
- Organic Synthesis and Catalysis Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, S. A. S. Nagar, Manauli PO, Punjab, 140306, India
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4
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Shan C, Zhong K, Qi X, Xu D, Qu LB, Bai R, Lan Y. Long distance unconjugated agostic-assisted 1,5-H shift in a Ru-mediated Alder-ene type reaction: mechanism and stereoselectivity. Org Chem Front 2018. [DOI: 10.1039/c8qo00699g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A long distance unconjugated novel 1,5-H shift mechanism for a Ru-catalyzed Alder-ene type alkene–alkyne coupling reaction was examined by DFT.
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Affiliation(s)
- Chunhui Shan
- Postdoctoral Station of Biomedical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Kangbao Zhong
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Xiaotian Qi
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Dongdong Xu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Ling-Bo Qu
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Ruopeng Bai
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Yu Lan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
- College of Chemistry and Molecular Engineering
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5
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Arif T, Borie C, Jean M, Vanthuyne N, Bertrand MP, Siri D, Nechab M. Organocopper triggered cyclization of conjugated dienynes via tandem SN2′/Alder-ene reaction. Org Chem Front 2018. [DOI: 10.1039/c7qo00288b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Propargylic carbonates were converted to indenes through a SN2′/Alder-ene cascade triggered by organocopper reagents.
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Affiliation(s)
| | | | - Marion Jean
- Aix-Marseille Univ
- Centrale Marseille
- CNRS
- iSm2
- Marseille
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6
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Mouysset D, Tessonnier C, Tintaru A, Dumur F, Jean M, Vanthuyne N, Bertrand MP, Siri D, Nechab M. Chiral Fidelity in the Diastereoselective and Enantiospecific Synthesis of Indenes from Axially Chiral Benzylidene Cyclanes. Chemistry 2017; 23:8375-8379. [DOI: 10.1002/chem.201701501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Indexed: 12/21/2022]
Affiliation(s)
| | | | | | | | - Marion Jean
- Aix Marseille Univ, Centrale Marseille, CNRS, Centrale Marseille, iSm2; Marseille France
| | - Nicolas Vanthuyne
- Aix Marseille Univ, Centrale Marseille, CNRS, Centrale Marseille, iSm2; Marseille France
| | | | - Didier Siri
- Aix Marseille Univ, CNRS, ICR; Marseille France
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7
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Liang H, Yan F, Dong X, Liu Q, Wei X, Liu S, Dong Y, Liu H. Palladium-catalyzed cascade metallo-ene/Suzuki coupling reaction of allenamides. Chem Commun (Camb) 2017; 53:3138-3141. [DOI: 10.1039/c7cc00191f] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A new type of cascade metallo-ene/Suzuki coupling reaction of allenamides catalyzed by palladium is described.
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Affiliation(s)
- Hanbing Liang
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Fachao Yan
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Xu Dong
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Qing Liu
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Xiaobing Wei
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Sheng Liu
- The Technical Center of Zibo Entry and Exit Inspection and Quarantine Bureau
- Zibo 255031
- P. R. China
| | - Yunhui Dong
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
| | - Hui Liu
- School of Chemical Engineering
- Shandong University of Technology
- Zibo 255049
- P. R. China
- The Technical Center of Zibo Entry and Exit Inspection and Quarantine Bureau
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8
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Borie C, Vanthuyne N, Bertrand MP, Siri D, Nechab M. Palladium Tandem Catalysis in the Atropodiastereoselective Synthesis of Indenes Bearing Central and Axial Chirality. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02867] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Cyril Borie
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13390 Marseille, France
| | - Nicolas Vanthuyne
- Aix Marseille Université, Centrale Marseille, CNRS, iSm2 UMR 7313, 13397, Marseille, France
| | | | - Didier Siri
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13390 Marseille, France
| | - Malek Nechab
- Aix-Marseille Université, CNRS, ICR UMR 7273, 13390 Marseille, France
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9
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Jin R, Liu S, Lan Y. Distortion–interaction analysis along the reaction pathway to reveal the reactivity of the Alder-ene reaction of enes. RSC Adv 2015. [DOI: 10.1039/c5ra10345b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The reactivity of uncatalyzed Alder-ene type reactions of hetero-substituted propylene is interpreted by distortion–interaction analysis of both the transition states and the complete reaction pathways.
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Affiliation(s)
- Rui Jin
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Song Liu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
| | - Yu Lan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400030
- China
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10
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Volla CMR, Bäckvall JE. Palladium-Catalyzed Aerobic Domino Oxidative Carbocyclization-Alkynylation of Allenynes. Angew Chem Int Ed Engl 2013; 52:14209-13. [DOI: 10.1002/anie.201308448] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Indexed: 01/06/2023]
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11
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Volla CMR, Bäckvall JE. Palladium-Catalyzed Aerobic Domino Oxidative Carbocyclization-Alkynylation of Allenynes. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201308448] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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12
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Alajarin M, Bonillo B, Marin-Luna M, Sanchez-Andrada P, Vidal A. Thermal Cyclization of Phenylallenes That Containortho-1,3-Dioxolan-2-yl Groups: New Cascade Reactions Initiated by 1,5-Hydride Shifts of Acetalic H Atoms. Chemistry 2013; 19:16093-103. [PMID: 24123192 DOI: 10.1002/chem.201301608] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 08/23/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Mateo Alajarin
- Departamento de Química Orgánica, Universidad de Murcia, Facultad de Química, Regional Campus of International Excellence, "Campus Mare Nostrum", Espinardo, 30100 Murcia (Spain).
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13
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Dabrowski JA, Haeffner F, Hoveyda AH. Combining NHC-Cu and Brønsted Base Catalysis: Enantioselective Allylic Substitution/Conjugate Additions with Alkynylaluminum Reagents and Stereospecific Isomerization of the Products to Trisubstituted Allenes. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303501] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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14
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Dabrowski JA, Haeffner F, Hoveyda AH. Combining NHC-Cu and Brønsted base catalysis: enantioselective allylic substitution/conjugate additions with alkynylaluminum reagents and stereospecific isomerization of the products to trisubstituted allenes. Angew Chem Int Ed Engl 2013; 52:7694-9. [PMID: 23864395 DOI: 10.1002/anie.201303501] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Indexed: 12/17/2022]
Abstract
All-catalytic route to trisubstituted allenes: The first examples of catalytic enantioselective allylic substitution reactions that involve alkyne-based nucleophiles and lead to products having tertiary stereogenic centers are followed by an exceptionally stereospecific amine-catalyzed isomerization to trisubstituted allenes (see picture; NHC = N-heterocyclic carbene).
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Affiliation(s)
- Jennifer A Dabrowski
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
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15
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Pardo-Rodríguez V, Marco-Martínez J, Buñuel E, Cárdenas DJ. Pd-Catalyzed Borylative Cyclization of Allenynes and Enallenes. Org Lett 2009; 11:4548-51. [DOI: 10.1021/ol9017694] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Virtudes Pardo-Rodríguez
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Juan Marco-Martínez
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Elena Buñuel
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Diego J. Cárdenas
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
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16
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Johnston E, Karlsson E, Lindberg S, Åkermark B, Bäckvall JE. Efficient Reoxidation of Palladium by a Hybrid Catalyst in Aerobic Palladium-Catalyzed Carbocyclization of Enallenes. Chemistry 2009; 15:6799-801. [DOI: 10.1002/chem.200900980] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Shen R, Zhu S, Huang X. Unexpected Pd-Catalyzed Coupling, Propargyl−Allenyl Isomerization and Alder−Ene Reaction: Facile Synthesis of Some Not Readily Available 2,3-Dihydrofuran Derivatives. J Org Chem 2009; 74:4118-23. [DOI: 10.1021/jo900440u] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ruwei Shen
- Department of Chemistry, Zhejiang University, Xixi Campus, Hangzhou 310028, P. R. China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Shugao Zhu
- Department of Chemistry, Zhejiang University, Xixi Campus, Hangzhou 310028, P. R. China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| | - Xian Huang
- Department of Chemistry, Zhejiang University, Xixi Campus, Hangzhou 310028, P. R. China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
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18
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Kappe CO, Dallinger D. Controlled microwave heating in modern organic synthesis: highlights from the 2004–2008 literature. Mol Divers 2009; 13:71-193. [PMID: 19381851 DOI: 10.1007/s11030-009-9138-8] [Citation(s) in RCA: 292] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2009] [Accepted: 02/27/2009] [Indexed: 01/25/2023]
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19
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Taber DF, Reddy PG, Arneson KO. A Potential Route to Neuroprostanes and Isoprostanes: Preparation of the Four Enantiomerically Pure Diastereomers of 13-F4t-NeuroP. J Org Chem 2008; 73:3467-74. [DOI: 10.1021/jo702600v] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Douglass F. Taber
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - P. Ganapati Reddy
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
| | - Kyle O. Arneson
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, and Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232
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20
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Gu Z, Ma S. Studies on Thermal Reactivity of β-(1,2-Allenyl)butenolides and 2-Allyl-3-allenylcyclohex-2-enones. Chemistry 2008; 14:2453-64. [DOI: 10.1002/chem.200701171] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Piera J, Krumlinde P, Strübing D, Bäckvall JE. Gold-Catalyzed Cyclization of Allene-Substituted Malonate Esters: Synthesis of β,γ-Unsaturated δ-Lactones. Org Lett 2007; 9:2235-7. [PMID: 17465562 DOI: 10.1021/ol070793v] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient method for the preparation of beta,gamma-unsaturated delta-lactones has been developed. The starting materials for the synthesis of these compounds are allene-substituted malonates which undergo gold-catalyzed cyclization by means of nucleophilic attack of the ester moiety on the allene. It is worth mentioning that this is the first example where an ester group attacks as a nucleophile in a gold-catalyzed transformation of allenes.
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Affiliation(s)
- Julio Piera
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden.
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22
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Piera J, Närhi K, Bäckvall JE. PdII-Catalyzed Aerobic Allylic Oxidative Carbocyclization of Allene-Substituted Olefins: Immobilization of an Oxygen-Activating Catalyst. Angew Chem Int Ed Engl 2006; 45:6914-7. [PMID: 17001719 DOI: 10.1002/anie.200602421] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Julio Piera
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden
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23
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Piera J, Närhi K, Bäckvall JE. PdII-Catalyzed Aerobic Allylic Oxidative Carbocyclization of Allene-Substituted Olefins: Immobilization of an Oxygen-Activating Catalyst. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200602421] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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