1
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Saha A, Ramesh E, Sahoo A. Brønsted Acid Promoted Sulfenylacyloxylation of Alkynes: Access to 4‐Sulfenylisocoumarins. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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2
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Omar YM, Santucci G, Afarinkia K. tert-Butyl(2-oxo-2 H-pyran-5-yl)carbamate as the First Chameleon Diene Bearing an Electron-Donating Substituent. Molecules 2022; 27:molecules27175666. [PMID: 36080432 PMCID: PMC9458009 DOI: 10.3390/molecules27175666] [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: 07/18/2022] [Revised: 08/10/2022] [Accepted: 08/29/2022] [Indexed: 11/16/2022] Open
Abstract
The 2(H)-pyran-2-one bearing electron-donating tert-butylcarbamate (BocNH-) group at the 5- position is a “chameleon” diene and undergoes efficient Diels–Alder cycloadditions with alkene dienophiles with both electron-rich and electron-deficient substituents. Cycloadditions afford the 5-substituted bicyclic lactone cycloadducts regardless of the electronic nature of the dienophile. However, cycloadditions with electronically matched electron-deficient dienophiles proceed faster than those with electronically mismatched electron-rich dienophiles.
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Affiliation(s)
- Yasser M. Omar
- Institute of Cancer Therapeutics, University of Bradford, Bradford BD7 1DP, UK
- Department Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| | - Giulia Santucci
- Department Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Assiut University, Assiut 71526, Egypt
| | - Kamyar Afarinkia
- Institute of Cancer Therapeutics, University of Bradford, Bradford BD7 1DP, UK
- School of Biomedical Sciences, University of West London, London W5 5RF, UK
- Correspondence:
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3
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Huang G, Kouklovsky C, Torre A. Inverse‐Electron‐Demand Diels–Alder Reactions of 2‐Pyrones: Bridged Lactones and Beyond. Chemistry 2021; 27:4760-4788. [DOI: 10.1002/chem.202003980] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Guanghao Huang
- Université Paris-Saclay CNRS Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO) 15, rue Georges Clémenceau 91405 Orsay Cedex France
| | - Cyrille Kouklovsky
- Université Paris-Saclay CNRS Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO) 15, rue Georges Clémenceau 91405 Orsay Cedex France
| | - Aurélien Torre
- Université Paris-Saclay CNRS Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO) 15, rue Georges Clémenceau 91405 Orsay Cedex France
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4
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Choi H, Shirley HJ, Aitken HRM, Schulte T, Söhnel T, Hume PA, Brimble MA, Furkert DP. Intermolecular Diels-Alder Cycloaddition/Cross-Coupling Sequences of 2-Bromo-1,3-butadienes. Org Lett 2020; 22:1022-1027. [PMID: 31990192 DOI: 10.1021/acs.orglett.9b04567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
2-Bromo-1,3-butadienes are demonstrated to be effective substrates for tandem Diels-Alder/transition metal cross-coupling reaction sequences. Intermolecular cycloaddition of a 2-bromo-1,3-diene with activated dienophiles proceeded under Lewis acid catalysis in generally high yields with good to excellent endo diastereoselectivity. The resulting vinyl bromide cycloadducts underwent subsequent Stille and Suzuki cross-couplings under standard conditions in good yields. Both the Diels-Alder and cross-coupling steps were highly tolerant of a range of functionalities and protecting groups. The use of the bromine substituent as both a cycloaddition directing group and cross-coupling nucleofuge avoids extra steps required to install and remove the more commonly used silyl enol ethers and enol sulfonates for each transformation and gives full control of the alkene regiochemistry throughout the reaction sequence. The 2-bromo-1,3-dienes were conveniently prepared in three steps from readily available aldehydes and established as hydrolytically stable and practical synthetic intermediates.
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Affiliation(s)
- Hans Choi
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
| | - Harry J Shirley
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
| | - Harry R M Aitken
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
| | - Tim Schulte
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
| | - Tilo Söhnel
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
| | - Paul A Hume
- School of Chemical and Physical Sciences , Victoria University of Wellington , Kelburn Parade , Wellington 6012 , New Zealand
| | - Margaret A Brimble
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand.,Maurice Wilkins Centre for Molecular Biodiscovery , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
| | - Daniel P Furkert
- School of Chemical Sciences , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand.,Maurice Wilkins Centre for Molecular Biodiscovery , The University of Auckland , Symonds Street , Auckland 1010 , New Zealand
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5
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Gao B, Zou S, Yang G, Ding Y, Huang H. Carbonylative cycloaddition between two different alkenes enabled by reactive directing groups: expedited construction of bridged polycyclic skeletons. Chem Commun (Camb) 2020; 56:12198-12201. [DOI: 10.1039/d0cc05362g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel palladium-catalyzed highly selective hydrocarbonylative cycloaddition reaction with two different alkenes in the presence of CO enabled by a reactive directing-group is developed, which offers efficient access to bicyclo[2,2,2]lactones.
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Affiliation(s)
- Bingjian Gao
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Suchen Zou
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Guoqing Yang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Yongzheng Ding
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Hanmin Huang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
- Center for Excellence in Molecular Synthesis of CAS
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6
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2 H -Pyran-2-ones and their annelated analogs as multifaceted building blocks for the fabrication of diverse heterocycles. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.028] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Abdullahi MH, Thompson LM, Bearpark MJ, Vinader V, Afarinkia K. The role of substituents in retro Diels–Alder extrusion of CO2 from 2(H)-pyrone cycloadducts. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.07.066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Tandem intramolecular Diels–Alder/retro-Diels–Alder cycloaddition of 2H-chromen-2-one as dienes with the expulsion of CO2. CHINESE CHEM LETT 2016. [DOI: 10.1016/j.cclet.2016.03.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Ghadari R. In silico study to evaluate the governing criteria in the BF3 catalyzed Diels-Alder reaction. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.07.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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Zhao YM, Maimone TJ. Short, enantioselective total synthesis of chatancin. Angew Chem Int Ed Engl 2015; 54:1223-6. [PMID: 25470723 PMCID: PMC4300267 DOI: 10.1002/anie.201410443] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Indexed: 11/06/2022]
Abstract
An enantioselective total synthesis of the polycyclic diterpene (+)-chatancin, a potent PAF antagonist, is reported. Proceeding in seven steps from dihydrofarnesal, this synthetic route was designed to circumvent macrocyclization-based strategies to complex, cyclized cembranoids. The described synthesis requires only six chromatographic purifications, is high yielding, and avoids protecting-group manipulations. An X-ray crystal structure of this fragile marine natural product was obtained.
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Affiliation(s)
- Yu-Ming Zhao
- Department of Chemistry, University of California, Berkeley, 826 Latimer Hall, Berkeley, CA 94720 (USA)
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12
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13
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Synthesis of a pseudo-disaccharide library and its application to the characterisation of the heparanase catalytic site. PLoS One 2013; 8:e82111. [PMID: 24260588 PMCID: PMC3832595 DOI: 10.1371/journal.pone.0082111] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 10/19/2013] [Indexed: 12/15/2022] Open
Abstract
A novel methodology is described for the efficient and divergent synthesis of pseudodisaccharides, molecules comprising of amino carbasugar analogues linked to natural sugars. The methodology is general and enables the introduction of diversity both at the carbasugar and the natural sugar components of the pseudodisaccharides. Using this approach, a series of pseudodisaccharides are synthesised that mimic the repeating backbone unit of heparan sulfate, and are tested for inhibition of heparanase, a disease-relevant enzyme that hydrolyses heparan sulfate. A new homology model of human heparanase is described based on a family 79 β-glucuronidase. This model is used to postulate a computational rationale for the observed activity of the different pseudodisaccharides and provide valuable information that informs the design of potential inhibitors of this enzyme.
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14
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Larsson R, Scheeren HW, Aben RWM, Johansson M, Sterner O. Total Synthesis of Transtaganolide E and F: Insight in the Biosynthesis of the Transtaganolides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301092] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Juranovič A, Kranjc K, Polanc S, Perdih F, Kočevar M. Diels–Alder reaction of fused pyran-2-ones with ethyl vinyl ether. MONATSHEFTE FUR CHEMIE 2012. [DOI: 10.1007/s00706-012-0734-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Li Z, Hong J, Weng L, Zhou X. Facile synthesis of sulfenyl-substituted isocoumarins, heterocycle-fused pyrones and 3-(inden-1-ylidene)isobenzofuranones by FeCl3-promoted regioselective annulation of o-(1-alkynyl)benzoates and o-(1-alkynyl)heterocyclic carboxylates with disulfides. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.12.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Sarotti AM, Spanevello RA, Suárez AG. Assessing the halogen effect in Diels–Alder reactions involving chiral α-halo enones. A combined experimental and DFT computational approach. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.05.143] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Juranovič A, Kranjc K, Perdih F, Polanc S, Kočevar M. Comparison of the reaction pathways and intermediate products of a microwave-assisted and high-pressure-promoted cycloaddition of vinyl-moiety-containing dienophiles on 2H-pyran-2-ones. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.03.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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20
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Štefane B, Perdih A, Pevec A, Šolmajer T, Kočevar M. The Participation of 2H-Pyran-2-ones in [4+2] Cycloadditions: An Experimental and Computational Study. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000236] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Goel A, Kumar V, Chaurasia S, Rawat M, Prasad R, Anand RS. Synthesis, Electrochemical and Optical Properties of Stable Yellow Fluorescent Fluoranthenes. J Org Chem 2010; 75:3656-62. [DOI: 10.1021/jo100420x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Atul Goel
- Division of Medicinal and Process Chemistry, Central Drug Research Institute, CSIR, Lucknow 226001, India
| | - Vijay Kumar
- Division of Medicinal and Process Chemistry, Central Drug Research Institute, CSIR, Lucknow 226001, India
| | - Sumit Chaurasia
- Division of Medicinal and Process Chemistry, Central Drug Research Institute, CSIR, Lucknow 226001, India
| | - Madhu Rawat
- Department of Electrical Engineering, Indian Institute of Technology, Kanpur 208016, India
| | - Ramesh Prasad
- Department of Electrical Engineering, Indian Institute of Technology, Kanpur 208016, India
| | - R. S. Anand
- Department of Electrical Engineering, Indian Institute of Technology, Kanpur 208016, India
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22
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Afarinkia K, Abdullahi MH, Scowen IJ. A new, general method for the synthesis of carbasugar-sugar pseudodisaccharides. Org Lett 2010; 11:5182-4. [PMID: 19824620 DOI: 10.1021/ol901960y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general synthetic methodology for the synthesis of sugar-carbasugar pseudodisaccharides is described. The methodology is based on the cycloaddition of pyran-2-ones to vinylated sugars and the subsequent manipulation of the cycloadducts to construct the carbasugar component of the pseudodisaccharide.
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Affiliation(s)
- Kamyar Afarinkia
- Institute of Cancer Therapeutics, University of Bradford, Richmond Road, Bradford, BD7 1DP, United Kingdom.
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23
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Wu W, He S, Zhou X, Lee CS. Diels-Alder Cycloadditions of 5-Hydroxy-2-pyrones: 2H-Pyran-2,5-diones and 5-(tert-Butyldimethylsilyloxy)-2-pyrones as Synthons. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901040] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Kirkham JD, Delaney PM, Ellames GJ, Row EC, Harrity JPA. An alkynylboronate cycloaddition strategy to functionalised benzyne derivatives. Chem Commun (Camb) 2010; 46:5154-6. [DOI: 10.1039/c0cc01345e] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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26
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Larkin SM, Vreven T, Bearpark MJ, Morokuma K. The application of the ONIOM hybrid method to the cycloaddition reactions of bromo-substituted 2(H)-pyran-2-ones. CAN J CHEM 2009. [DOI: 10.1139/v09-027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigate the performance of Our own N-layered Integrated molecular Orbital and molecular Mechanics (ONIOM) hybrid computational method applied to Diels–Alder reactions of bromo-2(H)-pyran-2-ones, combining the B3LYP/6–31G(d) method with a variety of low-level methods. We show that ONIOM is able to reproduce full B3LYP calculations, including the prediction of the stereoselectivity, which requires accurate potentials. We focus on the various ways in which the performance and potential errors of ONIOM can be analyzed, and show that the best method combination depends on the property one is interested in.
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Affiliation(s)
- Susan M. Larkin
- Department of Chemistry, Imperial College London, South Kensington campus, London SW7 2AZ, UK
- Gaussian, Inc, 340 Quinnipiac St Bldg 40, Wallingford, CT 06492 USA
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan
| | - Thom Vreven
- Department of Chemistry, Imperial College London, South Kensington campus, London SW7 2AZ, UK
- Gaussian, Inc, 340 Quinnipiac St Bldg 40, Wallingford, CT 06492 USA
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan
| | - Michael J. Bearpark
- Department of Chemistry, Imperial College London, South Kensington campus, London SW7 2AZ, UK
- Gaussian, Inc, 340 Quinnipiac St Bldg 40, Wallingford, CT 06492 USA
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan
| | - Keiji Morokuma
- Department of Chemistry, Imperial College London, South Kensington campus, London SW7 2AZ, UK
- Gaussian, Inc, 340 Quinnipiac St Bldg 40, Wallingford, CT 06492 USA
- Fukui Institute for Fundamental Chemistry, Kyoto University, Kyoto, 606-8103, Japan
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27
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28
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Goel A, Verma D. An expeditious protocol for sesquiterpene-cored functionalized arenes from S-(−)-citronellal. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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29
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Larsson R, Sterner O, Johansson M. Biomimetic Synthesis toward the Transtaganolides/Basiliolides. Org Lett 2009; 11:657-60. [DOI: 10.1021/ol802760z] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rikard Larsson
- Division of Organic Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Olov Sterner
- Division of Organic Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
| | - Martin Johansson
- Division of Organic Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
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30
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Chopin N, Gérard H, Chataigner I, Piettre SR. Benzofurans as Efficient Dienophiles in Normal Electron Demand [4 + 2] Cycloadditions. J Org Chem 2008; 74:1237-46. [DOI: 10.1021/jo802205d] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nathalie Chopin
- UMR CNRS 6014, IRCOF, Université de Rouen, 1 Rue Tesnières, F-76821 Mont Saint Aignan, France, and Laboratoire de Chimie Théorique, Université Paris VI, 3, rue Galilée, F-94200 Ivry-sur-Seine, France
| | - Hélène Gérard
- UMR CNRS 6014, IRCOF, Université de Rouen, 1 Rue Tesnières, F-76821 Mont Saint Aignan, France, and Laboratoire de Chimie Théorique, Université Paris VI, 3, rue Galilée, F-94200 Ivry-sur-Seine, France
| | - Isabelle Chataigner
- UMR CNRS 6014, IRCOF, Université de Rouen, 1 Rue Tesnières, F-76821 Mont Saint Aignan, France, and Laboratoire de Chimie Théorique, Université Paris VI, 3, rue Galilée, F-94200 Ivry-sur-Seine, France
| | - Serge R. Piettre
- UMR CNRS 6014, IRCOF, Université de Rouen, 1 Rue Tesnières, F-76821 Mont Saint Aignan, France, and Laboratoire de Chimie Théorique, Université Paris VI, 3, rue Galilée, F-94200 Ivry-sur-Seine, France
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31
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Zhou X, Wu W, Liu X, Lee CS. Base-Catalyzed Diels−Alder Reactions of 2H-Pyran-2,5-diones: A Mild Approach to Basiliolide B. Org Lett 2008; 10:5525-8. [DOI: 10.1021/ol8022787] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiongfei Zhou
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen University Town, Xili, Shenzhen 518055, China
| | - Wanqing Wu
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen University Town, Xili, Shenzhen 518055, China
| | - Xiaozu Liu
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen University Town, Xili, Shenzhen 518055, China
| | - Chi-Sing Lee
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen University Town, Xili, Shenzhen 518055, China
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32
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33
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Delaney PM, Browne DL, Adams H, Plant A, Harrity JP. A 2-pyrone cycloaddition route to functionalised aromatic boronic esters. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.08.118] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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34
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Ram RN, Kumar N. Synthesis of 2,4-disubstituted 3-chlorofurans and the effect of the chlorine substituent in furan Diels–Alder reactions. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.11.193] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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35
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Singh FV, Kumar V, Kumar B, Goel A. Regioselective synthesis of 2-amino-isophthalonitriles through a ring transformation strategy. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.056] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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36
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Kumar A, Singh FV, Goel A. A regioselective palladium-free protocol for accessing unsymmetrical biaryls through ring transformation of 6-aryl-α-pyrones. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.08.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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37
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Goel A, Singh FV, Dixit M, Verma D, Raghunandan R, Maulik PR. Highly Efficient Non-Palladium-Catalyzed Controlled Synthesis and X-ray Analysis of Functionalized 1,2-Diaryl-, 1,2,3-Triaryl-, and 1,2,3,4-Tetraarylbenzenes. Chem Asian J 2007; 2:239-47. [PMID: 17441158 DOI: 10.1002/asia.200600278] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A general, two-step, highly efficient synthesis of 1,2-diaryl-, 1,2,3-triaryl-, and 1,2,3,4-tetraarylbenzenes from simple stitching of alpha-oxo-ketene-S,S-acetals and active methylene compounds via a lactone intermediate is described. This procedure offers easy access to highly functionalized arylated benzenes that contain sterically demanding groups in good to excellent yields. The novelty of the procedure lies in the construction of aromatic compounds with the desired conformational flexibility along the molecular axis in a transition-metal-free environment through easily accessible precursors. Crystal analysis of these arylated benzene scaffolds showed that the peripheral aryl rings are arranged in a propeller-like fashion with respect to the central benzene ring. Examination of the crystal packing in the structure of a 1,2,3,4-tetraarylbenzene revealed an N...pi interaction between molecules related by a two-fold screw axis running in the direction of the a axis. Interestingly, the repeating array of N...pi interactions around the axis of this 1,2,3,4-tetraarylbenzene forces the molecules into a helical pattern.
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Affiliation(s)
- Atul Goel
- Medicinal and Process Chemistry, Central Drug Research Institute, Lucknow 226001, India.
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Kim HY, Cho CG. The Diels-Alder cycloadditions of 3,5-dibromo-2-pyrone and its derivatives. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s0959-6380(07)80004-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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39
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Chataigner I, Panel C, Gérard H, Piettre SR. Sulfonyl vs. carbonyl group: which is the more electron-withdrawing? Chem Commun (Camb) 2007:3288-90. [PMID: 17668103 DOI: 10.1039/b705034h] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unexpectedly high reactivity of nitrogenated aromatics protected as amides or carbamates, when compared to sulfonamides, can be explained by a decrease of the aromaticity due to a greater ability of the carbon-centered groups to achieve delocalisation of the nitrogen lone pair, resulting in stronger global withdrawing effects.
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Affiliation(s)
- Isabelle Chataigner
- Laboratoire des Fonctions Azotées et Oxygénées Complexes, Université de Rouen, UMR CNRS 6014, F-76821, Mont Saint Aignan, France.
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40
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Chung SI, Seo J, Cho CG. Tandem Diels−Alder Cycloadditions of 2-Pyrone-5-acrylates for the Efficient Synthesis of Novel Tetracyclolactones. J Org Chem 2006; 71:6701-4. [PMID: 16901177 DOI: 10.1021/jo061119e] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Readily prepared from the regioselective Pd-catalyzed coupling reactions of 3,5-dibromo-2-pyrone, 3-bromo-2-pyrone-5-carboxylates undergo tandem uninterrupted sequential Diels-Alder cycloaddition reactions with allyl vinyl ethers in a highly regio- and stereoselective fashion to provide a series of novel tetracyclolactones in good yields.
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Affiliation(s)
- Soo-Im Chung
- Department of Chemistry, Hanyang University, Seoul 131-791, Korea
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41
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Afarinkia K, Bahar A, Bearpark MJ, Garcia-Ramos Y, Ruggiero A, Neuss J, Vyas M. Investigation of the Diels-Alder cycloadditions of 2(H)-1,4-oxazin-2-ones. J Org Chem 2006; 70:9529-37. [PMID: 16268629 DOI: 10.1021/jo051646i] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Reaction: see text]. A variety of 5-chloro-2(H)-1,4-oxazin-2-ones bearing a range of substituents at their 3- and 6-positions undergo Diels-Alder cycloaddition as a 2-azadiene component with electron-rich, electron-deficient, and electron-neutral dienophiles. These reactions proceed with moderate regio- and stereoselectivity to afford relatively stable and readily isolable bridged bicyclic lactone cycloadducts. Chemical manipulation of these cycloadducts affords highly substituted and functionally rich piperidines. The regio- and stereochemical preferences of the cycloadditions of 5-chloro-2(H)-1,4-oxazin-2-ones are investigated computationally using density functional theory (B3LYP/6-31G).
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Affiliation(s)
- Kamyar Afarinkia
- Department of Chemistry, King's College, Strand, London WC2R 2LS, UK.
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42
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Kranjc K, Kočevar M. Diels–Alder reaction of highly substituted 2H-pyran-2-ones with alkynes: reactivity and regioselectivity. NEW J CHEM 2005. [DOI: 10.1039/b504852d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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