1
|
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.
Collapse
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
| |
Collapse
|
2
|
Hwu JR, Panja A, Gupta NK, Hu Y, Tan K, Lin C, Hwang K, Hsu M, Huang W, Tsay S. Domino Processes of Arynes Reacting with Three Classes of Nucleophiles for Organic Syntheses. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001499] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jih Ru Hwu
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Avijit Panja
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Nitesh K. Gupta
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Yu‐Chen Hu
- Department of Chemical Engineering National Tsing Hua University Hsinchu 30013 Taiwan
| | - Kui‐Thong Tan
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Chun‐Cheng Lin
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Kuo‐Chu Hwang
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Ming‐Hua Hsu
- Department of Chemistry National Changhua University of Education Changhua County 50007 Taiwan
| | - Wen‐Chieh Huang
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| | - Shwu‐Chen Tsay
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
| |
Collapse
|
3
|
Zhou S, Yuan F, Guo M, Wang G, Tang X, Zhao W. Switchable Synthetic Strategy toward Trisubstituted and Tetrasubstituted Exocyclic Alkenes. Org Lett 2018; 20:6710-6714. [DOI: 10.1021/acs.orglett.8b02801] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Sen Zhou
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Fangyuan Yuan
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Minjie Guo
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Guangwei Wang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Xiangyang Tang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Wentao Zhao
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| |
Collapse
|
4
|
Bryliakov KP. Catalytic Asymmetric Oxygenations with the Environmentally Benign Oxidants H2O2 and O2. Chem Rev 2017; 117:11406-11459. [DOI: 10.1021/acs.chemrev.7b00167] [Citation(s) in RCA: 226] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Konstantin P. Bryliakov
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
- Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| |
Collapse
|
5
|
Featherston AL, Miller SJ. Synthesis and evaluation of phenylalanine-derived trifluoromethyl ketones for peptide-based oxidation catalysis. Bioorg Med Chem 2016; 24:4871-4874. [PMID: 27452284 PMCID: PMC5053897 DOI: 10.1016/j.bmc.2016.07.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 07/05/2016] [Accepted: 07/06/2016] [Indexed: 11/24/2022]
Abstract
We report the synthesis of phenylalanine-derived trifluoromethyl ketones for the in situ generation of dioxiranes for the purpose of oxidation catalysis. The key features of this synthesis include the use of a masked ketone strategy and a Negishi cross-coupling to access the parent amino acid. The derivatives can be readily incorporated into a peptide for use in oxidation chemistry and exhibit good stability and reactivity.
Collapse
Affiliation(s)
- Aaron L Featherston
- Department of Chemistry, Yale University, PO Box 208107, New Haven, CT 06520-8107, United States
| | - Scott J Miller
- Department of Chemistry, Yale University, PO Box 208107, New Haven, CT 06520-8107, United States.
| |
Collapse
|
6
|
Dai W, Zhang X, Zhang J, Lin Y, Cao S. Synthesis of Exocyclic Trisubstituted Alkenes
via
Nickel‐ Catalyzed Kumada‐Type Cross‐Coupling Reaction of
gem
‐ Difluoroalkenes with Di‐Grignard Reagents. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500889] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Wenpeng Dai
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, People's Republic of China, Fax: (+86)‐21‐64252603; phone: (+86)‐21‐64253452
| | - Xuxue Zhang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, People's Republic of China, Fax: (+86)‐21‐64252603; phone: (+86)‐21‐64253452
| | - Juan Zhang
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, People's Republic of China, Fax: (+86)‐21‐64252603; phone: (+86)‐21‐64253452
| | - Yingyin Lin
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, People's Republic of China, Fax: (+86)‐21‐64252603; phone: (+86)‐21‐64253452
| | - Song Cao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, People's Republic of China, Fax: (+86)‐21‐64252603; phone: (+86)‐21‐64253452
| |
Collapse
|
7
|
Bradley TD, Dragan A, Tomkinson NC. Baeyer–Villiger oxidation under Payne epoxidation conditions. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.08.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
8
|
Wang C, Yamamoto H. Asymmetric Epoxidation Using Hydrogen Peroxide as Oxidant. Chem Asian J 2015; 10:2056-68. [PMID: 26061144 DOI: 10.1002/asia.201500293] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Indexed: 11/07/2022]
Abstract
Asymmetric epoxidation is one of the most important transformations in organic synthesis. Although tremendous progress was achieved in this field in the 1980s and 1990s, it is still desirable from both economical and ecological views to develop environmentally friendly catalytic epoxidation with a broad substrate scope. Hydrogen peroxide is a safe and cheap oxidant, which is easy to handle and generates water as the sole byproduct. Therefore, asymmetric epoxidation of olefins using hydrogen peroxide as oxidant has been a very active research field and has been investigated by many research groups in recent years. In this review, the exciting very recent developments of this rapidly growing area are surveyed and organized according to the catalyst systems.
Collapse
Affiliation(s)
- Chuan Wang
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, IL 60637, USA
| | - Hisashi Yamamoto
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, IL 60637, USA. , .,Molecular Catalyst Research Center, Chubu University, 1200 Matsumoto, Kasugai, Aichi 487-8501, Japan. ,
| |
Collapse
|
9
|
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
|
10
|
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.
Collapse
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)
| | | | | | | | | |
Collapse
|
11
|
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]
|
12
|
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
| | | | | | | |
Collapse
|
13
|
Torijano-Gutiérrez S, Díaz-Oltra S, Falomir E, Murga J, Carda M, Marco JA. Synthesis of combretastatin A-4 O-alkyl derivatives and evaluation of their cytotoxic, antiangiogenic and antitelomerase activity. Bioorg Med Chem 2013; 21:7267-74. [DOI: 10.1016/j.bmc.2013.09.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 09/22/2013] [Accepted: 09/26/2013] [Indexed: 11/26/2022]
|
14
|
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]
|
15
|
Romney DK, Miller SJ. A peptide-embedded trifluoromethyl ketone catalyst for enantioselective epoxidation. Org Lett 2012; 14:1138-41. [PMID: 22315978 DOI: 10.1021/ol3000712] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of peptide-based oxidation catalysts that use a transiently generated dioxirane as the chemically active species is reported. The active catalyst is a chiral trifluoromethyl ketone (Tfk) with a pendant carboxylic acid that can be readily incorporated into a peptide. These peptides were capable of epoxidizing alkenes in high yield (up to 89%) and enantiomeric ratios (er) ranging from 69.0:31.0 to 91.0:9.0, depending on the alkene substitution pattern.
Collapse
Affiliation(s)
- David K Romney
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, USA
| | | |
Collapse
|
16
|
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]
|
17
|
De Faveri G, Ilyashenko G, Watkinson M. Recent advances in catalytic asymmetric epoxidation using the environmentally benign oxidant hydrogen peroxide and its derivatives. Chem Soc Rev 2010; 40:1722-60. [PMID: 21079863 DOI: 10.1039/c0cs00077a] [Citation(s) in RCA: 270] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
There has been a recent drive to develop asymmetric catalytic methods to produce epoxides using environmentally benign oxidants, especially hydrogen peroxide. This critical review discusses the advances that have been made using both metal-based and organocatalytic homogeneous catalysts (142 references).
Collapse
Affiliation(s)
- Giorgio De Faveri
- The Joseph Priestly Building, School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | | | | |
Collapse
|
18
|
Saikia I, Kashyap B, Phukan P. Efficient Protocol for Stereoselective Epoxidation of Cinnamic Esters Using TsNBr2. SYNTHETIC COMMUN 2010. [DOI: 10.1080/00397910903318617] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
19
|
Egami H, Oguma T, Katsuki T. Oxidation Catalysis of Nb(salan) Complexes: Asymmetric Epoxidation of Allylic Alcohols Using Aqueous Hydrogen Peroxide as an Oxidant. J Am Chem Soc 2010; 132:5886-95. [DOI: 10.1021/ja100795k] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiromichi Egami
- Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Takuya Oguma
- Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Tsutomu Katsuki
- Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| |
Collapse
|
20
|
Jackson KL, Li W, Chen CL, Kishi Y. Scalable and efficient synthesis of the mycolactone core. Tetrahedron 2010; 66:2263-2272. [PMID: 20228884 DOI: 10.1016/j.tet.2010.02.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
A highly efficient, scalable, and stereoselective synthesis of the mycolactone core is reported. The synthesis consists of 14 longest linear steps, with 19% overall yield.
Collapse
Affiliation(s)
- Katrina L Jackson
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
| | | | | | | |
Collapse
|
21
|
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.
Collapse
Affiliation(s)
- Christopher P Burke
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
| | | |
Collapse
|
22
|
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.
Collapse
|
23
|
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.
Collapse
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
| |
Collapse
|
24
|
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
| | | |
Collapse
|
25
|
Yeung HL, Sham KC, Tsang CS, Lau TC, Kwong HL. A chiral iron-sexipyridine complex as a catalyst for alkene epoxidation with hydrogen peroxide. Chem Commun (Camb) 2008:3801-3. [DOI: 10.1039/b804281k] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Marsh B, Carbery DR. Synthetic methods : Part (ii) Oxidation and reduction methods. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b716595c] [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]
|
27
|
|
28
|
Matsumoto K, Sawada Y, Katsuki T. Asymmetric epoxidation of olefins catalyzed by Ti(salan) complexes using aqueous hydrogen peroxide as the oxidant. PURE APPL CHEM 2008. [DOI: 10.1351/pac200880051071] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ti(salan) complexes were found to be efficient catalysts for asymmetric epoxidation with aqueous hydrogen peroxide as the oxidant. In the presence of pH 7.4 phosphate buffer, the reaction of various conjugate olefins proceeded smoothly to afford the corresponding epoxides in high yield with high enantioselectivity, even on a multigram scale. Ti(salan) complexes could be prepared from Ti(OiPr)4 and the corresponding salan ligand and directly used without isolation and purification.
Collapse
Affiliation(s)
- Kazuhiro Matsumoto
- 1Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Yuji Sawada
- 1Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| | - Tsutomu Katsuki
- 1Department of Chemistry, Faculty of Science, Graduate School, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
| |
Collapse
|