1
|
Chin KF, Ye X, Li Y, Lee R, Kabylda AM, Leow D, Zhang X, Xia Ang EC, Tan CH. Bisguanidinium-Catalyzed Epoxidation of Allylic and Homoallylic Amines under Phase Transfer Conditions. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04862] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kek Foo Chin
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Xinyi Ye
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, P. R. China
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Richmond Lee
- Division of Science and Math, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore
| | - Adil M. Kabylda
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Dasheng Leow
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Xin Zhang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Esther Cai Xia Ang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Choon-Hong Tan
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| |
Collapse
|
2
|
Wang L, Que S, Ding Z, Vessally E. Oxidative carboxylation of olefins with CO2: environmentally benign access to five-membered cyclic carbonates. RSC Adv 2020; 10:9103-9115. [PMID: 35496570 PMCID: PMC9050038 DOI: 10.1039/c9ra10755j] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 03/16/2020] [Accepted: 02/18/2020] [Indexed: 11/21/2022] Open
Abstract
The purpose of this focus review is to provide a comprehensive overview of the direct synthesis of five-membered cyclic carbonates via oxidative carboxylation of the corresponding olefins and carbon dioxide with particular attention on the mechanistic features of the reactions. The review is divided into two main sections. The first section is a discussion of the single-step reactions, while the second consists of an overview of one-pot, two-step sequential reactions. This review provides an overview of the direct synthesis of five-membered cyclic carbonates via oxidative carboxylation of the corresponding olefins and carbon dioxide.![]()
Collapse
Affiliation(s)
- Liang Wang
- State Key Lab of Coal Mine Disaster Dynamics and Control
- Chongqing University
- Chongqing 400044
- China
| | - Sisi Que
- State Key Lab of Coal Mine Disaster Dynamics and Control
- Chongqing University
- Chongqing 400044
- China
- State Key Laboratory of Coal Resources in Western China
| | - Ziwei Ding
- State Key Laboratory of Coal Resources in Western China
- Xi'an University of Science and Technology
- Xi'an
- China
| | | |
Collapse
|
3
|
|
4
|
Zhu L, Le L, Yan M, Au CT, Qiu R, Kambe N. Carbon-Carbon Bond Formation of Trifluoroacetyl Amides with Grignard Reagents via C(O)-CF 3 Bond Cleavage. J Org Chem 2019; 84:5635-5644. [PMID: 30950272 DOI: 10.1021/acs.joc.9b00583] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The reaction of trifluoroacetyl amides with Grignard reagent for the substitution of CF3 group with various alkyl or aryl groups is described. A variety of aryl, quinolin-8-yl, and (hetero)alkyl functional groups as well as F, Cl, and Br atoms are well tolerated. These moisture-stable and easily available trifluoroacetyl amides can be conveniently obtained and used as new versatile precursors for isocyanates. The control experiments show that the reaction proceeds via an isocyanate intermediate and/or alkoxide/amide dual anionic intermediate.
Collapse
Affiliation(s)
- Longzhi Zhu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Liyuan Le
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Mingpan Yan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Chak-Tong Au
- College of Chemistry and Chemical Engineering , Hunan Institute of Engineering , Xiangtan 411104 , P. R. China
| | - Renhua Qiu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China
| | - Nobuaki Kambe
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering , Hunan University , Changsha 410082 , P. R. China.,Department of Applied Chemistry, Graduate School of Engineering , Osaka University , Suita , Osaka 565-0871 , Japan
| |
Collapse
|
5
|
Chen J, Zhu H, Chen J, Le ZG, Tu T. Synthesis, Characterization and Catalytic Application of Pyridine-Bridged N-Heterocyclic Carbene-Ruthenium Complexes in the Hydrogenation of Carbonates. Chem Asian J 2017; 12:2809-2812. [DOI: 10.1002/asia.201701303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 09/22/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Jiangbo Chen
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 P.R. China
| | - Haibo Zhu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 P.R. China
- School of Chemistry, Biology and Material Science; East China University of Technology; Nanchang 330013 P.R. China
| | - Jinjin Chen
- Department of Children Healthcare, Shanghai Children Hospital affiliated to Shanghai; Jiaotong University; No.355, Rd.Luding Shanghai 20062 P.R: China
| | - Zhang-Gao Le
- School of Chemistry, Biology and Material Science; East China University of Technology; Nanchang 330013 P.R. China
| | - Tao Tu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 P.R. China
| |
Collapse
|
6
|
Affiliation(s)
- Bo Zou
- Key Laboratory of Cluster Science, Ministry of Education of China; School of Chemistry and Chemical Engineering, Beijing Institute of Technology; Beijing 100081 China
| | - Changwen Hu
- Key Laboratory of Cluster Science, Ministry of Education of China; School of Chemistry and Chemical Engineering, Beijing Institute of Technology; Beijing 100081 China
| |
Collapse
|
7
|
Brambilla M, Davies SG, Fletcher AM, Roberts PM, Thomson JE, Zimmer D. Pyrrolizidines, indolizidines and quinolizidines via a double reductive cyclisation protocol: concise asymmetric syntheses of (+)-trachelanthamidine, (+)-tashiromine and (+)-epilupinine. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.09.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
8
|
Davies SG, Fletcher AM, Thomson JE. Hydrogen bond directed epoxidation: diastereoselective olefinic oxidation of allylic alcohols and amines. Org Biomol Chem 2015; 12:4544-9. [PMID: 24854106 DOI: 10.1039/c4ob00616j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article compares the diastereoselective epoxidation of acyclic and cyclic allylic alcohols, with the chemo- and diastereoselective olefinic oxidation of a range of acyclic and cyclic allylic amines. The diastereoselectivity in these systems is compared and a discussion about the origin of this high diastereocontrol is also presented. The ammonium directed epoxidation methodology has been extended to more complex substrates and representative applications of this protocol in natural product synthesis are also summarised.
Collapse
Affiliation(s)
- Stephen G Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
| | | | | |
Collapse
|
9
|
Concise total asymmetric syntheses of (−)-fagomine, two of its epimers, and two seven-membered ring congeners. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
10
|
Chen S, Mercado BQ, Bergman RG, Ellman JA. Regio- and Diastereoselective Synthesis of Highly Substituted, Oxygenated Piperidines from Tetrahydropyridines. J Org Chem 2015; 80:6660-8. [PMID: 26098485 PMCID: PMC4496584 DOI: 10.1021/acs.joc.5b00816] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diastereoselective epoxidation and regioselective ring-opening methods were developed for the synthesis of densely substituted, oxygenated piperidines from two classes of tetrahydropyridines with distinct stereochemical displays of functionalities. A new and practical in situ prepared epoxidation reagent was developed for the diastereoselective epoxidation of one class of sterically hindered tetrahydropyridines. The novel bifunctional epoxidation reagent, 2-carboperoxy-3,4,5,6-tetrafluorobenzoic acid, was designed to incorporate highly reactive percarboxy acid and pendant carboxylic acid groups, which through hydrogen bonding to the amino group successfully overrode steric effects and directed epoxidation to occur at the more hindered face of the tetrahydropyridine. Nucleophilic ring-opening of the epoxides with water, alcohols, and HF proceeded with high regioselectivity, affording piperidinol products with adjacent tetrasubstituted carbons.
Collapse
Affiliation(s)
- Shuming Chen
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Robert G. Bergman
- Department of Chemistry, University of California, Berkeley Berkeley, CA 94720-1416 (USA) and Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (USA)
| | - Jonathan A. Ellman
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| |
Collapse
|
11
|
Ghosh D, Saravanan S, Gupta N, Abdi SHR, Khan NUH, Kureshy RI, Bajaj HC. Phosphotungstic Acid as an Efficient Catalyst for Allylation of Isatins andN-tert-Butyloxycarbonylamido Sulfones Under Solvent-Free Conditions. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402130] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
12
|
Cresswell AJ, Davies SG, Roberts PM, Thomson JE. Beyond the Balz-Schiemann reaction: the utility of tetrafluoroborates and boron trifluoride as nucleophilic fluoride sources. Chem Rev 2014; 115:566-611. [PMID: 25084541 DOI: 10.1021/cr5001805] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Alexander J Cresswell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Mansfield Road, Oxford OX1 3TA, United Kingdom
| | | | | | | |
Collapse
|
13
|
|
14
|
Xie Y, Sun M, Zhou H, Cao Q, Gao K, Niu C, Yang H. Enantiospecific Total Synthesis of (+)-Tanikolide via a Key [2,3]-Meisenheimer Rearrangement with an Allylic Amine N-Oxide-Directed Epoxidation and a One-Pot Trichloroisocyanuric Acid N-Debenzylation and N-Chlorination. J Org Chem 2013; 78:10251-63. [DOI: 10.1021/jo4016437] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yangla Xie
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| | - Moran Sun
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| | - Hang Zhou
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| | - Qiwei Cao
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| | - Kaige Gao
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| | - Changling Niu
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| | - Hua Yang
- School of Pharmaceutical
Science, Zhengzhou University, Zhengzhou 450001, China
| |
Collapse
|
15
|
Davies SG, Fletcher AM, Frost AB, Lee JA, Roberts PM, Thomson JE. Trading N and O: asymmetric syntheses of β-hydroxy-α-amino acids via α-hydroxy-β-amino esters. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.08.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
16
|
Petrowsky M, Ismail M, Glatzhofer DT, Frech R. Mass and Charge Transport in Cyclic Carbonates: Implications for Improved Lithium Ion Battery Electrolytes. J Phys Chem B 2013; 117:5963-70. [DOI: 10.1021/jp402220a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matt Petrowsky
- Department of Chemistry and Biochemistry,
University
of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United
States
| | - Mohd Ismail
- Department of Chemistry and Biochemistry,
University
of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United
States
| | - Daniel T. Glatzhofer
- Department of Chemistry and Biochemistry,
University
of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United
States
| | - Roger Frech
- Department of Chemistry and Biochemistry,
University
of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United
States
| |
Collapse
|
17
|
Whiteoak CJ, Nova A, Maseras F, Kleij AW. Merging sustainability with organocatalysis in the formation of organic carbonates by using CO(2) as a feedstock. CHEMSUSCHEM 2012; 5:2032-2038. [PMID: 22945474 DOI: 10.1002/cssc.201200255] [Citation(s) in RCA: 177] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 06/12/2012] [Indexed: 06/01/2023]
Abstract
The use of phenolic compounds as organocatalysts is discussed in the context of the atom-efficient cycloaddition of carbon dioxide to epoxides, forming useful cyclic organic carbonate products. The presence and cooperative nature of adjacent phenolic groups in the catalyst structure results in significantly enhanced catalytic efficiencies, allowing these CO(2) fixation reactions to operate efficiently under virtually ambient conditions. The cooperative effect has also been studied by computational methods. Furthermore, when the cycloaddition reactions are carried out on a larger scale and under solvent-free conditions, further enhancements in activity are observed, combined with the advantageous requirement of reduced loadings of the binary organocatalyst system. The reported system is among one of the mildest and most effective metal-free catalysts for this conversion and contributes to a much more sustainable development of organic carbonate production; this feature has not been the main focus of previous contributions in this area.
Collapse
Affiliation(s)
- Christopher J Whiteoak
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Spain
| | | | | | | |
Collapse
|
18
|
Cresswell AJ, Davies SG, Lee JA, Morris MJ, Roberts PM, Thomson JE. Diastereodivergent Hydroxyfluorination of Cyclic and Acyclic Allylic Amines: Synthesis of 4-Deoxy-4-fluorophytosphingosines. J Org Chem 2012; 77:7262-81. [DOI: 10.1021/jo301056r] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Alexander J. Cresswell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - James A. Lee
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - Melloney J. Morris
- Syngenta, Jealott’s Hill International Research Centre, Bracknell,
Berkshire RG42 6EY, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| |
Collapse
|
19
|
Brennan MB, Claridge TDW, Compton RG, Davies SG, Fletcher AM, Henstridge MC, Hewings DS, Kurosawa W, Lee JA, Roberts PM, Schoonen AK, Thomson JE. Ammonium-directed olefinic epoxidation: kinetic and mechanistic insights. J Org Chem 2012; 77:7241-61. [PMID: 22827448 DOI: 10.1021/jo3010556] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ammonium-directed olefinic epoxidations of a range of differentially N-substituted cyclic allylic and homoallylic amines (derived from cyclopentene, cyclohexene, and cycloheptene) have been investigated, and the reaction kinetics have been analyzed. The results of these studies suggest that both the ring size and the identity of the substituents on nitrogen are important in determining both the overall rate and the stereochemical outcome of the epoxidation reaction. In general, secondary amines or tertiary amines with nonsterically demanding substituents on nitrogen are superior to tertiary amines with sterically demanding substituents on nitrogen in their ability to promote the oxidation reaction. Furthermore, in all cases examined, the ability of the (in situ formed) ammonium substituent to direct the stereochemical course of the epoxidation reaction is either comparable or superior to that of the analogous hydroxyl substituent. Much slower rates of ring-opening of the intermediate epoxides are observed in cyclopentene-derived and cycloheptene-derived allylic amines as compared with their cyclohexene-derived allylic and homoallylic amine counterparts, allowing for isolation of these intermediates in both of the former cases.
Collapse
Affiliation(s)
- Méabh B Brennan
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Brock EA, Davies SG, Lee JA, Roberts PM, Thomson JE. Asymmetric Synthesis of the Tropane Alkaloid (+)-Pseudococaine via Ring-Closing Iodoamination. Org Lett 2012; 14:4278-81. [DOI: 10.1021/ol3020607] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Anne Brock
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James A. Lee
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| |
Collapse
|
21
|
The conjugate addition of enantiomerically pure lithium amides as chiral ammonia equivalents part II: 2005−2011. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.08.009] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
22
|
Olivares-Romero JL, Li Z, Yamamoto H. Hf(IV)-catalyzed enantioselective epoxidation of N-alkenyl sulfonamides and N-tosyl imines. J Am Chem Soc 2012; 134:5440-3. [PMID: 22420598 DOI: 10.1021/ja211880s] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric epoxidation of allylic and homoallylic amine derivatives catalyzed by Hf(IV)-bishydroxamic acid complexes is described. Under similar conditions, aldimine and ketimine produced oxaziridines. The sulfonyl group is demonstrated to be an effective directing group for these transformations.
Collapse
|
23
|
Wang JQ, Sun J, Cheng WG, Shi CY, Dong K, Zhang XP, Zhang SJ. Synthesis of dimethyl carbonate catalyzed by carboxylic functionalized imidazolium salt via transesterification reaction. Catal Sci Technol 2012. [DOI: 10.1039/c1cy00342a] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
24
|
Cresswell AJ, Davies SG, Lee JA, Morris MJ, Roberts PM, Thomson JE. Ring-opening hydrofluorination of 2,3- and 3,4-epoxy amines by HBF4·OEt2: application to the asymmetric synthesis of (S,S)-3-deoxy-3-fluorosafingol. J Org Chem 2011; 76:4617-27. [PMID: 21495698 DOI: 10.1021/jo200517w] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Treatment of a range of 2,3- and 3,4-epoxy amines with HBF(4)·OEt(2) at room temperature results in fast and efficient S(N)2-type ring-opening hydrofluorination to give stereodefined amino fluorohydrins. Operational simplicity, scalability, and short reaction time at ambient temperature are notable features of this method. The utility of this methodology is exemplified in a concise asymmetric synthesis of (S,S)-3-deoxy-3-fluorosafingol.
Collapse
Affiliation(s)
- Alexander J Cresswell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford, UK
| | | | | | | | | | | |
Collapse
|
25
|
Asghar SF, Lewis SE. Synthetic methods Part (II): oxidation and reduction methods. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1oc90012a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|