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Elkin PK, Durfee ND, Rawal VH. Diels-Alder Reactions of 1-Alkoxy-1-amino-1,3-butadienes: Direct Synthesis of 6-Substituted and 6,6-Disubstituted 2-Cyclohexenones and 6-Substituted 5,6-Dihydropyran-2-ones. Org Lett 2021; 23:5288-5293. [PMID: 34062059 PMCID: PMC9078830 DOI: 10.1021/acs.orglett.1c01031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the cycloaddition reactions of 1-alkoxy-1-amino-1,3-butadienes. These doubly activated dienes are prepared on a multigram scale from crotonic acid chloride and its derivatives. The dienes undergo Diels-Alder (DA) and hetero-Diels-Alder (HDA) reactions under mild reaction conditions with a variety of electron-deficient dienophiles to afford cycloadducts in good yields with excellent regioselectivities. The hydrolysis of the DA cycloadducts provides 6-substituted and 6,6-disubstituted 2-cylohexenones, which are versatile building blocks for complex molecule synthesis. The corresponding HDA cycloadducts afford 6-substituted 5,6-dihydropyran-2-ones.
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Affiliation(s)
- Pavel K Elkin
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Nathaniel D Durfee
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Viresh H Rawal
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
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2
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Tobal IE, Bautista R, Diez D, Garrido NM, García-García P. 1,3-Cyclohexadien-1-Als: Synthesis, Reactivity and Bioactivities. Molecules 2021; 26:1772. [PMID: 33809941 PMCID: PMC8004145 DOI: 10.3390/molecules26061772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/09/2021] [Accepted: 03/12/2021] [Indexed: 11/16/2022] Open
Abstract
In synthetic organic chemistry, there are very useful basic compounds known as building blocks. One of the main reactions wherein they are applied for the synthesis of complex molecules is the Diels-Alder cycloaddition. This reaction is between a diene and a dienophile. Among the most important dienes are the cyclic dienes, as they facilitate the reaction. This review considers the synthesis and reactivity of one of these dienes with special characteristics-it is cyclic and has an electron withdrawing group. This building block has been used for the synthesis of biologically active compounds and is present in natural compounds with interesting properties.
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Affiliation(s)
- Ignacio E. Tobal
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, University of Salamanca, Plaza de los Caídos 1–5, 37008 Salamanca, Spain; (I.E.T.); (R.B.); (D.D.); (N.M.G.)
| | - Rocío Bautista
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, University of Salamanca, Plaza de los Caídos 1–5, 37008 Salamanca, Spain; (I.E.T.); (R.B.); (D.D.); (N.M.G.)
| | - David Diez
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, University of Salamanca, Plaza de los Caídos 1–5, 37008 Salamanca, Spain; (I.E.T.); (R.B.); (D.D.); (N.M.G.)
| | - Narciso M. Garrido
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, University of Salamanca, Plaza de los Caídos 1–5, 37008 Salamanca, Spain; (I.E.T.); (R.B.); (D.D.); (N.M.G.)
| | - Pilar García-García
- Departamento de Ciencias Farmacéuticas, Facultad de Farmacia, CIETUS, IBSAL, University of Salamanca, Campus Miguel de Unamuno, 37007 Salamanca, Spain
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Pis Diez CM, Fernandez JF, Di Venosa G, Casas A, Pis Diez R, Palermo JA. One-step preparation of novel 1-( N-indolyl)-1,3-butadienes by base-catalysed isomerization of alkynes as an access to 5-( N-indolyl)-naphthoquinones. RSC Adv 2018; 8:35998-36006. [PMID: 35558441 PMCID: PMC9088550 DOI: 10.1039/c8ra05208e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 10/15/2018] [Indexed: 01/31/2023] Open
Abstract
A series of novel 1-(N-indolyl)-1,3-butadienes, as (1 : 1) mixtures of the (E) and (Z) dienes, was prepared in one step by base-catalysed isomerization of N-alkylindoles with a terminal butyne chain. The reaction conditions are mild, and in all cases the yields were very high (>90%). The (E) and (Z) dienes were separable by preparative TLC and could be fully characterized. This isomerization proceeded readily in the case of a butynyl chain, but didn't take place with a pentynyl chain. A mechanism was proposed for this reaction, based on previous studies on the isomerization of alkynes in basic media, and a key intermediate that supports the proposed mechanism could be isolated and fully characterized. A theoretical study of the proposed mechanism was performed by computational methods and the results validated the proposal. The reactivity of the synthesized dienes was studied in Diels-Alder reactions with p-benzoquinone, to obtain a small library of new 5-(N-indolyl)-1,4-naphthoquinones.The lack of reactivity in the case of the (Z) isomers was explained by calculation of the rotational curves of the central bond of the (Z) and (E) dienes. Finally, the cytotoxicity of the new 5-(N-indolyl)-1,4-naphthoquinones was tested against a panel of three cell lines.
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Affiliation(s)
- C M Pis Diez
- Universidad de Buenos Aires, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria Pabellón 2 - (1428) Buenos Aires Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR) Buenos Aires Argentina
| | - J F Fernandez
- Universidad de Buenos Aires, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria Pabellón 2 - (1428) Buenos Aires Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR) Buenos Aires Argentina
| | - G Di Venosa
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP) CONICET and Hospital de Clínicas José de San Martin, Universidad de Buenos Aires Córdoba 2351, 1er subsuelo Ciudad de Buenos Aires, 1120AAF Buenos Aires Argentina
| | - A Casas
- Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP) CONICET and Hospital de Clínicas José de San Martin, Universidad de Buenos Aires Córdoba 2351, 1er subsuelo Ciudad de Buenos Aires, 1120AAF Buenos Aires Argentina
| | - R Pis Diez
- CEQUINOR (CONICET-CCT-La Plata, UNLP) Bvd 120 N1465 1900 La Plata Argentina
| | - J A Palermo
- Universidad de Buenos Aires, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria Pabellón 2 - (1428) Buenos Aires Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR) Buenos Aires Argentina
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4
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Affiliation(s)
- Navjeet Kaur
- Department of Chemistry, Banasthali Vidyapith, Banasthali, India
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Türkmen YE, Gravel M, Rawal VH. Studies Directed toward the Synthesis of Aspidophytine: Construction of Its Perhydroquinoline Core. J Org Chem 2016; 81:10454-10462. [PMID: 27525506 DOI: 10.1021/acs.joc.6b01574] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have developed an efficient route for the synthesis of the perhydroquinoline core of the indole alkaloid aspidophytine (2), starting from commercially available and inexpensive 3-acetylpyridine. This densely functionalized perhydroquinoline core displays four contiguous stereocenters including an all-carbon quaternary center. The synthetic sequence features a highly effective Diels-Alder reaction using a carbamate-substituted siloxy diene accompanied by a spontaneous intramolecular substitution of the newly formed 3°-alkyl bromide with a carbamate group. The installation of the electron-rich aniline moiety was accomplished via a TBSOTf-mediated intramolecular aza-Michael reaction, and the relative stereochemistry of the aza-Michael product (30) was confirmed by X-ray crystallographic analysis. Among the useful transformations that were developed through this study is a highly enantioselective Diels-Alder reaction of a versatile cyclic carbamate siloxy diene.
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Affiliation(s)
- Yunus E Türkmen
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue Chicago, Illinois 60637, United States
| | - Michel Gravel
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue Chicago, Illinois 60637, United States
| | - Viresh H Rawal
- Department of Chemistry, University of Chicago , 5735 South Ellis Avenue Chicago, Illinois 60637, United States
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Zalesskiy SS, Shlapakov NS, Ananikov VP. Visible light mediated metal-free thiol-yne click reaction. Chem Sci 2016; 7:6740-6745. [PMID: 28451118 PMCID: PMC5355861 DOI: 10.1039/c6sc02132h] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 07/08/2016] [Indexed: 12/15/2022] Open
Abstract
The carbon-sulfur bond formation reaction is of paramount importance for functionalized materials design, as well as for biochemical applications. The use of expensive metal-based catalysts and the consequent contamination with trace metal impurities are challenging drawbacks of the existing methodologies. Here, we describe the first environmentally friendly metal-free photoredox pathway to the thiol-yne click reaction. Using Eosin Y as a cheap and readily available catalyst, C-S coupling products were obtained in high yields (up to 91%) and excellent selectivity (up to 60 : 1). A 3D-printed photoreactor was developed to create arrays of parallel reactions with temperature stabilization to improve the performance of the catalytic system.
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Affiliation(s)
- Sergey S Zalesskiy
- Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky prospekt, 47 , Moscow , 119991 , Russia .
| | - Nikita S Shlapakov
- Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky prospekt, 47 , Moscow , 119991 , Russia .
| | - Valentine P Ananikov
- Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky prospekt, 47 , Moscow , 119991 , Russia .
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Foster RW, Benhamou L, Porter MJ, Bučar DK, Hailes HC, Tame CJ, Sheppard TD. Irreversible endo-selective diels-alder reactions of substituted alkoxyfurans: a general synthesis of endo-cantharimides. Chemistry 2015; 21:6107-14. [PMID: 25756502 PMCID: PMC4406157 DOI: 10.1002/chem.201406286] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2014] [Indexed: 11/29/2022]
Abstract
The [4+2] cycloaddition of 3-alkoxyfurans with N-substituted maleimides provides the first general route for preparing endo-cantharimides. Unlike the corresponding reaction with 3H furans, the reaction can tolerate a broad range of 2-substitued furans including alkyl, aromatic, and heteroaromatic groups. The cycloaddition products were converted into a range of cantharimide products with promising lead-like properties for medicinal chemistry programs. Furthermore, the electron-rich furans are shown to react with a variety of alternative dienophiles to generate 7-oxabicyclo[2.2.1]heptane derivatives under mild conditions. DFT calculations have been performed to rationalize the activation effect of the 3-alkoxy group on a furan Diels-Alder reaction.
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Affiliation(s)
- Robert W Foster
- Department of Chemistry, University College London, Christopher Ingold Laboratories20 Gordon Street, London, WC1H 0AJ (UK)
| | - Laure Benhamou
- Department of Chemistry, University College London, Christopher Ingold Laboratories20 Gordon Street, London, WC1H 0AJ (UK)
| | - Michael J Porter
- Department of Chemistry, University College London, Christopher Ingold Laboratories20 Gordon Street, London, WC1H 0AJ (UK)
| | - Dejan-Krešimir Bučar
- Department of Chemistry, University College London, Christopher Ingold Laboratories20 Gordon Street, London, WC1H 0AJ (UK)
| | - Helen C Hailes
- Department of Chemistry, University College London, Christopher Ingold Laboratories20 Gordon Street, London, WC1H 0AJ (UK)
| | - Christopher J Tame
- GlaxoSmithKline, Medicines Research CentreGunnels Wood Road, Stevenage, Herts, SG1 2NY (UK)
| | - Tom D Sheppard
- Department of Chemistry, University College London, Christopher Ingold Laboratories20 Gordon Street, London, WC1H 0AJ (UK)
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8
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Zeng R, Sheng H, Rao B, Feng Y, Wang H, Sun Y, Chen M, Zhu M. An efficient and green approach to synthesizing enamines by intermolecular hydroamination of activated alkynes. Chem Res Chin Univ 2015. [DOI: 10.1007/s40242-015-4388-8] [Citation(s) in RCA: 3] [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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Choi J, Park H, Yoo HJ, Kim S, Sorensen EJ, Lee C. Tandem Diels–Alder and Retro-Ene Reactions of 1-Sulfenyl- and 1-Sulfonyl-1,3-dienes as a Traceless Route to Cyclohexenes. J Am Chem Soc 2014; 136:9918-21. [DOI: 10.1021/ja505721v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jin Choi
- Department
of Chemistry, Seoul National University, Seoul 151-747, South Korea
| | - Hoyoon Park
- Department
of Chemistry, Seoul National University, Seoul 151-747, South Korea
| | - Hyun Jung Yoo
- Department
of Chemistry, Seoul National University, Seoul 151-747, South Korea
| | - Sinae Kim
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Erik J. Sorensen
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Chulbom Lee
- Department
of Chemistry, Seoul National University, Seoul 151-747, South Korea
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10
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Formation and Reactivity of 5-Aminopenta-2,4-Dienals. ADVANCES IN HETEROCYCLIC CHEMISTRY 2014. [DOI: 10.1016/b978-0-12-420160-6.00001-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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