1
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Zhang G, Feng B, Wang Y, Chen J, Ma X, Song Q. 1,1-Oxycarbonation of Terminal Alkynes via Sequential Borylation, 1,2-Migration, and Oxidation with Oxone. Org Lett 2024; 26:3109-3113. [PMID: 38552168 DOI: 10.1021/acs.orglett.4c00738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Alkynes are readily available and multifunctional synthetic intermediates, but their 1,1-oxofunctionalization remains challenging. Herein, we report a 1,1-oxycarbonation of terminal alkynes to construct ketones through sequential borylation, 1,2-carbon migration, and oxidation with Oxone as the proton source and oxidant. The synthetic potential of this transformation is showcased by the broad functional groups, scale-up synthesis, and diverse product transformations.
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Affiliation(s)
- Guan Zhang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian 350108, China
| | - Bofan Feng
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian 350108, China
| | - Yutong Wang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Jinglong Chen
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Xingxing Ma
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian 350108, China
| | - Qiuling Song
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian 350108, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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2
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Singh SK, Mishra N, Kumar S, Jaiswal MK, Tiwari VK. Growing Impact of Carbohydrate‐Based Organocatalysts. ChemistrySelect 2022. [DOI: 10.1002/slct.202201314] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sumit K. Singh
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Nidhi Mishra
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Sunil Kumar
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Manoj K. Jaiswal
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
| | - Vinod K. Tiwari
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 INDIA
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3
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Wojaczyńska E, Steppeler F, Iwan D, Scherrmann MC, Marra A. Synthesis and Applications of Carbohydrate-Based Organocatalysts. Molecules 2021; 26:7291. [PMID: 34885873 PMCID: PMC8659088 DOI: 10.3390/molecules26237291] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 11/22/2021] [Accepted: 11/24/2021] [Indexed: 12/22/2022] Open
Abstract
Organocatalysis is a very useful tool for the asymmetric synthesis of biologically or pharmacologically active compounds because it avoids the use of noxious metals, which are difficult to eliminate from the target products. Moreover, in many cases, the organocatalysed reactions can be performed in benign solvents and do not require anhydrous conditions. It is well-known that most of the above-mentioned reactions are promoted by a simple aminoacid, l-proline, or, to a lesser extent, by the more complex cinchona alkaloids. However, during the past three decades, other enantiopure natural compounds, the carbohydrates, have been employed as organocatalysts. In the present exhaustive review, the detailed preparation of all the sugar-based organocatalysts as well as their catalytic properties are described.
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Affiliation(s)
- Elżbieta Wojaczyńska
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50 370 Wrocław, Poland
| | - Franz Steppeler
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50 370 Wrocław, Poland
| | - Dominika Iwan
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50 370 Wrocław, Poland
| | - Marie-Christine Scherrmann
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Saclay, Bâtiment 420, 91405 Orsay, France
| | - Alberto Marra
- Institut des Biomolécules Max Mousseron (IBMM-UMR 5247), Université de Montpellier, Pôle Chimie Balard Recherche, 1919 Route de Mende, 34293 Montpellier, France
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4
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Zhang H, Yao Q, Lin L, Xu C, Liu X, Feng X. Catalytic Asymmetric Epoxidation of Electron-Deficient Enynes Promoted by Chiral N,N′
-Dioxide-Scandium(III) Complex. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700555] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hang Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Qian Yao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Chaoran Xu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry; Sichuan University; Chengdu 610064 People's Republic of China
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5
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Candu N, Rizescu C, Podolean I, Tudorache M, Parvulescu VI, Coman SM. Efficient magnetic and recyclable SBILC (supported basic ionic liquid catalyst)-based heterogeneous organocatalysts for the asymmetric epoxidation of trans-methylcinnamate. Catal Sci Technol 2015. [DOI: 10.1039/c4cy00891j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A green heterogeneous catalytic alternative was developed for the asymmetric epoxidation of trans-methylcinnamate to (2R,3S)-phenyl glycidate.
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Affiliation(s)
- N. Candu
- Department of Organic Chemistry, Biochemistry and Catalysis
- Faculty of Chemistry
- University of Bucharest
- Bucharest 030018
- Romania
| | - C. Rizescu
- Department of Organic Chemistry, Biochemistry and Catalysis
- Faculty of Chemistry
- University of Bucharest
- Bucharest 030018
- Romania
| | - I. Podolean
- Department of Organic Chemistry, Biochemistry and Catalysis
- Faculty of Chemistry
- University of Bucharest
- Bucharest 030018
- Romania
| | - M. Tudorache
- Department of Organic Chemistry, Biochemistry and Catalysis
- Faculty of Chemistry
- University of Bucharest
- Bucharest 030018
- Romania
| | - V. I. Parvulescu
- Department of Organic Chemistry, Biochemistry and Catalysis
- Faculty of Chemistry
- University of Bucharest
- Bucharest 030018
- Romania
| | - S. M. Coman
- Department of Organic Chemistry, Biochemistry and Catalysis
- Faculty of Chemistry
- University of Bucharest
- Bucharest 030018
- Romania
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6
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Chu Y, Hao X, Lin L, Chen W, Li W, Tan F, Liu X, Feng X. ChiralN,N′-Dioxide-Scandium(III)-Catalyzed Asymmetric Epoxidation of 2-Arylidene-1,3-diketones with Hydrogen Peroxide. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400341] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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Davis RL, Stiller J, Naicker T, Jiang H, Jørgensen KA. Asymmetric organocatalytic epoxidations: reactions, scope, mechanisms, and applications. Angew Chem Int Ed Engl 2014; 53:7406-26. [PMID: 24919420 DOI: 10.1002/anie.201400241] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Indexed: 12/26/2022]
Abstract
Chiral epoxides serve as versatile building blocks in the synthesis of complex organic frameworks. The high strain imposed by the three-membered ring system makes epoxides prone to a variety of nucleophilic ring-opening reactions. Since the development of the Sharpless epoxidation, there have been many important contributions and advances in this area. With the rapid development of the field of asymmetric organocatalysis, a wide range of organocatalysts is now able to catalyze the epoxidation of broad class of unsaturated carbonyl compounds. In this Minireview, recent progress in the development of organocatalytic asymmetric epoxidation methods, the proposed mechanisms of these reactions and their applications as intermediates is reported.
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Affiliation(s)
- Rebecca L Davis
- Center for Catalysis, Department of Chemistry, Aarhus University, 8000 Aarhus C (Denmark); Department of Chemistry, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 (Canada)
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8
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Davis RL, Stiller J, Naicker T, Jiang H, Jørgensen KA. Organokatalytische asymmetrische Epoxidierungen - Reaktionen, Mechanismen und Anwendungen. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400241] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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9
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Zhu Y, Wang Q, Cornwall RG, Shi Y. Organocatalytic asymmetric epoxidation and aziridination of olefins and their synthetic applications. Chem Rev 2014; 114:8199-256. [PMID: 24785198 DOI: 10.1021/cr500064w] [Citation(s) in RCA: 326] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Yingguang Zhu
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523, United States
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10
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Shi H, Li Y. Amine-catalyzed olefin epoxidation mechanism with enantioselectivity: Oxidation by secondary amine N,N-dioxo-radical derived from electron spin resonance, electrospray ionization-mass spectrometry and density functional theory calculation. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcata.2013.03.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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A new and efficient method for the synthesis of α,α-dihaloketones by oxyhalogenation of alkynes using oxone®–KX (X = Cl, Br, or I). Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.05.072] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Hussain H, Green IR, Ahmed I. Journey describing applications of oxone in synthetic chemistry. Chem Rev 2013; 113:3329-71. [PMID: 23451713 DOI: 10.1021/cr3004373] [Citation(s) in RCA: 186] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Hidayat Hussain
- Department of Chemistry, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany.
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13
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Brown LJ, Brown RCD, Raja R. Heterogenisation of ketonecatalysts within mesoporous supports for asymmetric epoxidation. RSC Adv 2013. [DOI: 10.1039/c2ra21837b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Wang W, Xue J, Tian T, Jiao Y, Li Y. The first asymmetric total synthesis of (+)-coriandrone A and B. Org Biomol Chem 2013; 11:6686-90. [DOI: 10.1039/c3ob41497c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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16
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Srinivasarao M, Park T, Chen Y, Fuchs PL. Noteworthy observations accompanying synthesis of the apoptolidin disaccharide. Chem Commun (Camb) 2011; 47:5858-60. [DOI: 10.1039/c1cc11448d] [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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17
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Kimachi T, Torii E, Ishimoto R, Sakue A, Ju-ichi M. Asymmetric total synthesis of rhinacanthin A. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.06.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Wang B, Wu XY, Wong OA, Nettles B, Zhao MX, Chen D, Shi Y. A diacetate ketone-catalyzed asymmetric epoxidation of olefins. J Org Chem 2009; 74:3986-9. [PMID: 19388627 PMCID: PMC2749516 DOI: 10.1021/jo900330n] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A fructose-derived diacetate ketone has been shown to be an effective catalyst for asymmetric epoxidation. High ee values have been obtained for a variety of trans and trisubstituted olefins including electron-deficient alpha,beta-unsaturated esters as well as certain cis olefins.
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Affiliation(s)
- Bin Wang
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Xin-Yan Wu
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - O. Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Brian Nettles
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Mei-Xin Zhao
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Dajun Chen
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Yian Shi
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
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19
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Abstract
Organo-catalyzed asymmetric epoxidation has received much attention in the past 30 years and significant progress has been made for various types of olefins. This review will cover the advancement made in the field of chiral ketone and chiral iminium salt-catalyzed epoxidations.
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20
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Wong OA, Shi Y. Organocatalytic oxidation. Asymmetric epoxidation of olefins catalyzed by chiral ketones and iminium salts. Chem Rev 2008; 108:3958-87. [PMID: 18590339 DOI: 10.1021/cr068367v] [Citation(s) in RCA: 364] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- O Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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21
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Zhang Z, Tang J, Wang X, Shi H. Chiral ketone- or chiral amine-catalyzed asymmetric epoxidation of cis-1-propenylphosphonic acid using hydrogen peroxide as oxidant. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.molcata.2008.01.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Nieto N, Munslow IJ, Barr J, Benet-Buchholz J, Vidal-Ferran A. Dioxirane mediated asymmetric epoxidations: stereochemical studies via isotopic labeling. Org Biomol Chem 2008; 6:2276-81. [DOI: 10.1039/b801922c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Meng XB, Li YF, Li ZJ. Acyl chloride/DABCO-promoted acetal migration of 1,2:4,5-di-O-isopropylidene-d-fructopyranose. Carbohydr Res 2007; 342:1101-4. [PMID: 17336949 DOI: 10.1016/j.carres.2007.02.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2007] [Revised: 02/05/2007] [Accepted: 02/06/2007] [Indexed: 11/19/2022]
Abstract
An unprecedented acetal migration was observed when 1,2:4,5-di-O-isopropylidene-D-fructose was treated with various acyl chlorides and 1,4-diaza-bicyclo[2.2.2]octane (DABCO). 2,3:4,5-Di-O-isopropylidene-D-fructose derivatives were isolated as the only product in high to quantitative yields. The acylium cations generated in situ were speculated as the electrophilic species to initiate the migration process.
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Affiliation(s)
- Xiang-Bao Meng
- Department of Chemical Biology, School of Pharmaceutical Sciences, State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100083, PR China
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24
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Fristrup P, Lassen PR, Tanner D, Jalkanen KJ. Direct determination of absolute configuration: a vibrational circular dichroism study on dimethyl-substituted phenyloxiranes synthesized by Shi epoxidation. Theor Chem Acc 2006. [DOI: 10.1007/s00214-006-0186-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Shing TK, Luk T, Lee CM. Asymmetric epoxidation of cis-alkenes with arabinose-derived ketones: enantioselective synthesis of the side chain of Taxol®. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.116] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Tse MK, Bhor S, Klawonn M, Anilkumar G, Jiao H, Spannenberg A, Döbler C, Mägerlein W, Hugl H, Beller M. Ruthenium-Catalyzed Asymmetric Epoxidation of Olefins Using H2O2, Part II: Catalytic Activities and Mechanism. Chemistry 2006; 12:1875-88. [PMID: 16432912 DOI: 10.1002/chem.200501262] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Asymmetric epoxidation of olefins with 30 % H2O2 in the presence of [Ru(pybox)(pydic)] 1 and [Ru(pyboxazine)(pydic)] 2 has been studied in detail (pybox = pyridine-2,6-bisoxazoline, pyboxazine = pyridine-2,6-bisoxazine, pydic = 2,6-pyridinedicarboxylate). 35 Ruthenium complexes with sterically and electronically different substituents have been tested in environmentally benign epoxidation reactions. Mono-, 1,1-di-, cis- and trans-1,2-di-, tri-, and tetra-substituted aromatic olefins with versatile functional groups can be epoxidized with this type of catalyst in good to excellent yields (up to 100 %) with moderate to good enantioselectivies (up to 84 % ee). Additive and solvent effects as well as the relative rate of reaction with different catalysts have been established. It is shown that the presence of weak organic acids or an electron-withdrawing group on the catalyst increases the reactivity. New insights on the reaction intermediates and reaction pathway of the ruthenium-catalyzed epoxidation are proposed on the basis of density functional theory calculation and experiments.
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Affiliation(s)
- Man Kin Tse
- Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V. Albert-Einstein-Strasse 29a, 18059 Rostock (Germany)
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27
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Xia QH, Ge HQ, Ye CP, Liu ZM, Su KX. Advances in homogeneous and heterogeneous catalytic asymmetric epoxidation. Chem Rev 2005; 105:1603-62. [PMID: 15884785 DOI: 10.1021/cr0406458] [Citation(s) in RCA: 719] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Q-H Xia
- Laboratory for Advanced Materials and New Catalysis, School of Chemistry and Materials Science, Hubei University, Wuhan 430062, China.
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28
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Catalytic enantioselective epoxidation with arabinose-derived uloses containing tunable steric sensors. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.09.226] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Shing TK, Leung YC, Yeung KW. Catalytic asymmetric epoxidation of alkenes with arabinose-derived uloses. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00145-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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30
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Armstrong A, Ahmed G, Dominguez-Fernandez B, Hayter BR, Wailes JS. Enantioselective epoxidation of alkenes catalyzed by 2-fluoro-N-carbethoxytropinone and related tropinone derivatives. J Org Chem 2002; 67:8610-7. [PMID: 12444645 DOI: 10.1021/jo026322y] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Several alpha-substituted N-carbethoxytropinones have been evaluated as catalysts for asymmetric epoxidation of alkenes with Oxone, via a dioxirane intermediate. alpha-Fluoro-N-carbethoxytropinone (2) has been studied in detail and is an efficient catalyst which does not suffer from Baeyer-Villiger decomposition and can be used in relatively low loadings. This ketone was prepared in enantiomerically pure form using chiral base desymmetrization of N-carbethoxytropinone. Asymmetric epoxidation catalyzed by 2 affords epoxides with up to 83% ee. Among other derivatives tested, the alpha-acetoxy derivative 7 affords the highest enantioselectivities.
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Affiliation(s)
- Alan Armstrong
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, U.K.
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31
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32
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Wu XY, She X, Shi Y. Highly enantioselective epoxidation of alpha, beta-unsaturated esters by chiral dioxirane. J Am Chem Soc 2002; 124:8792-3. [PMID: 12137521 DOI: 10.1021/ja020478y] [Citation(s) in RCA: 134] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper describes a highly enantioselective epoxidation of alpha,beta-unsaturated esters using the fructose-derived ketone 2 as catalyst and Oxone as oxidant. High ee's have been obtained for a number of trans and trisubstituted substrates (82-98% ee). The results described show that it is feasible for dioxiranes to effectively epoxidize electron-deficient olefins with high ee's.
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Affiliation(s)
- Xin-Yan Wu
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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33
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Bonini C, Righi G. A critical outlook and comparison of enantioselective oxidation methodologies of olefins. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00440-4] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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34
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Stearman CJ, Behar V. Screening chiral fluorinated binaphthyl ketone catalysts for asymmetric epoxidation. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00173-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Klein S, Roberts SM. 2-Substituted-2,4-endo-dimethyl-8-oxabicyclo[3.2.1]octan-3-ones as catalysts for the asymmetric epoxidation of some alkenes with Oxone®. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b205946k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Armstrong A, Moss WO, Reeves JR. Asymmetric epoxidation catalyzed by esters of α-hydroxy-8-oxabicyclo[3.2.1]octan-3-one. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0957-4166(01)00495-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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