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Imperio D, Valloni F, Caprioglio D, Minassi A, Casali E, Panza L. Stereoselective Shi-type epoxidation with 3-oxo-4,6- O-benzylidene pyranoside catalysts: unveiling the role of carbohydrate skeletons. RSC Adv 2024; 14:16778-16783. [PMID: 38784424 PMCID: PMC11112678 DOI: 10.1039/d4ra03011g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Accepted: 05/17/2024] [Indexed: 05/25/2024] Open
Abstract
Asymmetric epoxidation represents a hot topic in organic synthesis. In recent years, organocatalysts based on sugar skeletons have been exploited in asymmetric epoxidation to achieve enantiomeric pure epoxides. In this work, two different endocyclic ketones derived from glucose and galactose protected with a 4,6-O-benzylidene group have been prepared and exploited for Shi-type epoxidation. The two carbohydrates show an opposite preferential stereoselective epoxidation on various olefins, affording the epoxides in high conversions and modest enantioselectivities. DFT calculations disclosed the reasons behind the inversion of selectivity achieved by the two catalysts, showing that a delicate balance between the catalyst conformation, its protecting groups, and the secondary interactions with the substrate govern the final observed results.
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Affiliation(s)
- Daniela Imperio
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale Largo Donegani 2 28100 Novara Italy
| | - Filippo Valloni
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale Largo Donegani 2 28100 Novara Italy
| | - Diego Caprioglio
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale Largo Donegani 2 28100 Novara Italy
| | - Alberto Minassi
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale Largo Donegani 2 28100 Novara Italy
| | - Emanuele Casali
- Department of Chemistry, University of Pavia Viale Taramelli, 12 27100 Pavia Italy
| | - Luigi Panza
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale Largo Donegani 2 28100 Novara Italy
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2
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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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3
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Affiliation(s)
- Xiangqing Feng
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Haifeng Du
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
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4
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Maruhashi K, Okayama Y, Inoue R, Ashida S, Toyomori Y, Okano K, Mori A. Chirality recognition of winding vine-shaped heterobiaryls with molecular asymmetry. Kinetic and dynamic kinetic resolution by Shi's asymmetric epoxidation. Sci Rep 2018; 8:1704. [PMID: 29374202 PMCID: PMC5786050 DOI: 10.1038/s41598-018-19878-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 01/09/2018] [Indexed: 11/09/2022] Open
Abstract
The chirality of winding vine-shaped heterobiaryls with molecular asymmetry is recognized by a sugar-based chiral oxidant. Kinetic resolution of (±)-bisbenzoimidazole bearing an olefin moiety takes place with Shi's asymmetric epoxidation to observe krel value up to ca. 35 affording the corresponding epoxide. The reaction of a (±)-bithiophene derivative also recognized the chirality to give the corresponding epoxide with er of 96:4 at 39% conversion. Dynamic kinetic resolution is found to take place when unsymmetrical biaryl composed of benzoimidazole/thiophene is subjected to Shi's epoxidation, whose conversion of the racemic substrate exceeds to 50%.
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Affiliation(s)
- Kazuki Maruhashi
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Yoichi Okayama
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Ryo Inoue
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Shiomi Ashida
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Yuka Toyomori
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Kentaro Okano
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan
| | - Atsunori Mori
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
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5
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Synthesis of (R)-Modafinil via Organocatalyzed and Non-Heme Iron-Catalyzed Sulfoxidation Using H2O2 as an Environmentally Benign Oxidant. Symmetry (Basel) 2017. [DOI: 10.3390/sym9060088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The first organocatalyzed sulfoxidation reaction towards enantioenriched (R)-modafinil (Armodafinil®), a drug against narcolepsy, is reported here. A series of chiral organocatalysts, e.g., different chiral BINOL-phosphates, or a fructose-derived N-substituted oxazolidinone ketone (Shi catalyst) were applied for the sulfoxidation reaction with environmentally friendly H2O2 as a convenient oxygen transferring agent. Furthermore, the potential of a biomimetic catalytic system consisting of FeCl3 and a dipeptide-based chiral ligand was demonstrated, which constitutes the most successful asymmetric non-heme iron-catalyzed synthesis of (R)-modafinil so far.
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Hurem D, Dudding T. Enantioselective synthesis of mosquito oviposition pheromone and its epimer from a naturally occurring fatty acid. RSC Adv 2015. [DOI: 10.1039/c5ra19306k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Direct epoxidation of cis-5-hexadecenoic acid towards the synthesis of Mosquito Oviposition Pheromone (MOP) and evaluation of Dynamic Kinetic Asymmetric Transformation (DYKAT) for late-stage asymmetric induction are presented.
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Affiliation(s)
- David Hurem
- Department of Chemistry
- Brock University
- St. Catharines
- Canada
| | - Travis Dudding
- Department of Chemistry
- Brock University
- St. Catharines
- Canada
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7
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Held FE, Wei S, Eder K, Tsogoeva SB. One-pot route to β-adrenergic blockers via enantioselective organocatalysed epoxidation of terminal alkenes as a key step. RSC Adv 2014. [DOI: 10.1039/c4ra04011b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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8
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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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9
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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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10
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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: 333] [Impact Index Per Article: 33.3] [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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11
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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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12
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Wei S, Messerer R, Tsogoeva SB. Asymmetric Synthesis of β-Adrenergic Blockers through Multistep One-Pot Transformations Involving In Situ Chiral Organocatalyst Formation. Chemistry 2011; 17:14380-4. [DOI: 10.1002/chem.201102931] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Indexed: 11/12/2022]
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14
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Armstrong A, Bettati M, White AJ. Catalytic enantioselective alkene epoxidation using novel spirocyclic N-carbethoxy-azabicyclo[3.2.1]octanones. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Burke CP, Shi Y. Enantioselective epoxidation of nonconjugated cis-olefins by chiral dioxirane. Org Lett 2010; 11:5150-3. [PMID: 19824657 DOI: 10.1021/ol901724v] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A variety of nonconjugated cis-olefins has been enantioselectively epoxidized with chiral ketones 2, and up to 92% ee has been obtained. The two prochiral faces of an olefin are likely stereodifferentiated by the relative hydrophobicity of the olefin substituents and/or allylic oxygen functionality.
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Affiliation(s)
- Christopher P Burke
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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16
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Wong OA, Shi Y. Asymmetric epoxidation of fluoroolefins by chiral dioxirane. Fluorine effect on enantioselectivity. J Org Chem 2010; 74:8377-80. [PMID: 19795858 DOI: 10.1021/jo901553t] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The asymmetric epoxidation of various fluoroolefins has been studied using chiral ketone catalyst, and up to 93% ee was achieved with fructose-derived ketone 1.
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Affiliation(s)
- O Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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17
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Matsumoto K, Oguma T, Katsuki T. Highly Enantioselective Epoxidation of Styrenes Catalyzed by Proline-DerivedC1-Symmetric Titanium(Salan) Complexes. Angew Chem Int Ed Engl 2009; 48:7432-5. [DOI: 10.1002/anie.200903567] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Matsumoto K, Oguma T, Katsuki T. Highly Enantioselective Epoxidation of Styrenes Catalyzed by Proline-DerivedC1-Symmetric Titanium(Salan) Complexes. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200903567] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Matsumoto K, Kubo T, Katsuki T. Highly Enantioselective Epoxidation ofcis-Alkenylsilanes. Chemistry 2009; 15:6573-5. [DOI: 10.1002/chem.200901048] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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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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21
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Novikov R, Bernardinelli G, Lacour J. Highly Enantioselective Biphasic Iminium-Catalyzed Epoxidation of Alkenes. On the Importance of the Counterion and of N(sp2)C(sp3) Rotamers. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200800778] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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22
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Boutureira O, McGouran JF, Stafford RL, Emmerson DPG, Davis BG. Accessible sugars as asymmetric olefin epoxidation organocatalysts: glucosaminide ketones in the synthesis of terminal epoxides. Org Biomol Chem 2009; 7:4285-8. [DOI: 10.1039/b911675c] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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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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24
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Wang B, Wong OA, Zhao MX, Shi Y. Asymmetric epoxidation of 1,1-disubstituted terminal olefins by chiral dioxirane via a planar-like transition state. J Org Chem 2008; 73:9539-43. [PMID: 18850744 PMCID: PMC2736380 DOI: 10.1021/jo801576k] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Various 1,1-disubstituted terminal olefins have been investigated for asymmetric epoxidation using chiral ketone catalysts. Up to 88% ee has been achieved with a lactam ketone, and a planar transition state is likely to be a major reaction pathway.
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Affiliation(s)
- Bin Wang
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - O. Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Mei-Xin Zhao
- 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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25
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Enantioselective epoxidation of α,β-enones promoted by (1R,3S,4S)-2-azanorbornyl-3-methanol as an organocatalyst. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.07.175] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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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: 368] [Impact Index Per Article: 23.0] [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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27
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Novikov R, Bernardinelli G, Lacour J. Enantioselective Olefin Epoxidation using Axially Chiral Biaryl Azepinium Salts as Catalysts. Rapidin-situ Screening and Origin of the Stereocontrol. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200800022] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Abstract
While amino acids, terpenes and alkaloids have found broad application as tools in stereoselective organic synthesis, carbohydrates have only lately been recognised as versatile starting materials for chiral auxiliaries, reagents, ligands and organocatalysts. The structural diversity of carbohydrates and the high density of functional groups offer a wide variety of opportunities for derivatization and tailoring of synthetic tools to a specific problem.
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Affiliation(s)
- Mike M K Boysen
- Institute of Organic Chemistry, Gottfried-Wilhelm-Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany.
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29
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Pettersson M, Knueppel D, Martin SF. Concise, Stereoselective Approach to the Spirooxindole Ring System of Citrinadin A. Org Lett 2007; 9:4623-6. [DOI: 10.1021/ol702132v] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Martin Pettersson
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712
| | - Daniel Knueppel
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712
| | - Stephen F. Martin
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712
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30
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Burke CP, Shu L, Shi Y. An N-aryl-substituted oxazolidinone-containing ketone-catalyzed asymmetric epoxidation with hydrogen peroxide as the primary oxidant. J Org Chem 2007; 72:6320-3. [PMID: 17622173 DOI: 10.1021/jo0708644] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Asymmetric epoxidation of various olefins with an N-aryl-substituted oxazolidinone-containing ketone as catalyst and hydrogen peroxide as the primary oxidant has been investigated, and up to 96% ee was obtained.
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Affiliation(s)
- Christopher P Burke
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
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31
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Burke CP, Shi Y. Regio- and enantioselective epoxidation of dienes by a chiral dioxirane: synthesis of optically active vinyl cis-epoxides. Angew Chem Int Ed Engl 2007; 45:4475-8. [PMID: 16764008 DOI: 10.1002/anie.200600840] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Christopher P Burke
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
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32
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Abstract
This paper describes a highly chemo- and enantioselective epoxidation of conjugated cis-enynes using readily available glucose-derived ketone 2 as catalyst and Oxone as oxidant to form cis-propargyl epoxides in high ee's. The interaction between the alkyne group of the substrate and the oxazolidinone moiety of the ketone catalyst as well as the interactions between the substituents on enynes and the oxazolidinone moiety of the ketone catalyst are important for the stereodifferentiation.
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Affiliation(s)
- Christopher P Burke
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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33
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Wang B, Shen YM, Shi Y. Enantioselective Synthesis of γ-Aryl-γ-butyrolactones by Sequential Asymmetric Epoxidation, Ring Expansion, and Baeyer−Villiger Oxidation. J Org Chem 2006; 71:9519-21. [PMID: 17137387 DOI: 10.1021/jo061341j] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper describes an enantioselective synthesis of gamma-butyrolactones, using the N-tolyl-substituted oxazolidinone-containing ketone as catalyst and Oxone as oxidant via a sequential asymmetric epoxidation of benzylidenecyclopropanes, ring expansion, and Baeyer-Villiger oxidation. Up to 91% ee was obtained. Optically active cyclobutanones can also be obtained by suppressing the Baeyer-Villiger oxidation with use of more ketone catalyst and less Oxone.
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Affiliation(s)
- Bin Wang
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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34
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Enantioselective olefin epoxidation using novel biphenyl and binaphthyl azepines and azepinium salts. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.08.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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35
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A practical synthesis of N-aryl-substituted oxazolidinone-containing ketone catalysts for asymmetric epoxidation. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.06.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Burke CP, Shi Y. Regio- and Enantioselective Epoxidation of Dienes by a Chiral Dioxirane: Synthesis of Optically Active Vinylcis-Epoxides. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600840] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Gonçalves MH, Martinez A, Grass S, Page PCB, Lacour J. Enantioselective olefin epoxidation using homologous amine and iminium catalysts—a direct comparison. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.05.132] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wong OA, Shi Y. Studies of Substituent Effect on Asymmetric Epoxidation of Chromenes by Chiral Dioxirane. J Org Chem 2006; 71:3973-6. [PMID: 16674077 DOI: 10.1021/jo0604179] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of 6- and 8-substituted chromenes has been investigated for asymmetric epoxidation using chiral ketone catalysts. Up to 93% ee was achieved. Higher ee's are obtained when substrates are substituted at the 6-position. The enhanced enantioselectivity is likely due to the beneficial interaction between the 6-substituent of the substrate and the N-aryl or alkyl group of the ketone catalyst.
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Affiliation(s)
- O Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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