1
|
Liu T, Yisimayili N, Chu LF, Lu CD. Diastereoselective Synthesis of Less Accessible Fluorine-Containing Acyclic Tetrasubstituted Stereocenters via Electrophilic Fluorination of β,β-Disubstituted Metalloenamines. J Org Chem 2024; 89:5726-5740. [PMID: 38598176 DOI: 10.1021/acs.joc.4c00306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
A stereocontrolled protocol was developed to construct less accessible fluorine-containing acyclic tetrasubstituted stereocenters bearing two sterically and electronically similar alkyl groups at the α-position of carbonyls. In this process, tBuOK-promoted stereospecific α-deprotonation of α,α-disubstituted N-tert-butanesulfinyl ketimines or NH deprotonation of β,β-disubstituted enesulfinamides generates geometry-defined multisubstituted metalloenamines, followed by stereoselective electrophilic fluorination with the N-fluoro ammonium salt of quinine, affording the acyclic α-fluorinated ketimines with excellent diastereoselectivities.
Collapse
Affiliation(s)
- Tao Liu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | | | - Li-Feng Chu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
- School of Health, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| |
Collapse
|
2
|
Shibata N, Cahard D. N-Fluoro Ammonium Salts of Cinchona Alkaloids in Enantioselective Electrophilic Fluorination. CHEM REC 2023; 23:e202300096. [PMID: 37096873 DOI: 10.1002/tcr.202300096] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Revised: 03/31/2023] [Indexed: 04/26/2023]
Abstract
From 2000, our two research groups independently and simultaneously designed and developed a novel family of electrophilic fluorinating reagents based on the use of Cinchona alkaloids. The chiral N-fluoro ammonium salts demonstrated the highest efficiency compared to prior art in enantioselective electrophilic fluorination for a wide range of substrates. In this account, we tell our respective stories, how the same idea germinated in our laboratories, the characterization of the chiral reagents, the use in stoichiometric quantity then the development of a catalytic version, the application to the synthesis of chiral fluorinated molecules of pharmaceutical interest, and finally the exploitation of our reagents by other teams and for other applications.
Collapse
Affiliation(s)
- Norio Shibata
- Department of Engineering, Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan
| | - Dominique Cahard
- CNRS, UMR 6014 COBRA - Normandie Université, 76821, Mont Saint Aignan, France
| |
Collapse
|
3
|
Zaikin PA, Dyan OT, Elanov IR, Borodkin GI. Ionic Liquid-Assisted Grinding: An Electrophilic Fluorination Benchmark. Molecules 2021; 26:5756. [PMID: 34641300 PMCID: PMC8510021 DOI: 10.3390/molecules26195756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/18/2021] [Accepted: 09/20/2021] [Indexed: 11/17/2022] Open
Abstract
We demonstrated the influence of liquid additives on the rate and selectivity of mechanochemical fluorination of aromatic and 1,3-dicarbonyl compounds with F-TEDA-BF4. Substoichiometric catalytic quantities of ionic liquids speed up the reaction. We proposed an improved protocol for ionic liquids-assisted fluorination that allows easy and efficient isolation of fluorinated products by vacuum sublimation. A careful choice of additive results in high yields of fluorinated products and low E-factor for the overall process. Here, we report a benchmarking study of various ionic liquids in comparison with representative molecular solvents. A lower viscosity of ionic liquid additive is typically associated with higher yields and a higher degree of difluorination. Ionic liquids with fluorous anions (triflate and triflimide) are shown to be the most efficient catalysts for ionic liquid-assisted grinding.
Collapse
Affiliation(s)
- Pavel A. Zaikin
- Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 9 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (I.R.E.); (G.I.B.)
| | - Ok Ton Dyan
- Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 9 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (I.R.E.); (G.I.B.)
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogov St., 630090 Novosibirsk, Russia
| | - Innokenty R. Elanov
- Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 9 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (I.R.E.); (G.I.B.)
| | - Gennady I. Borodkin
- Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of Russian Academy of Sciences, 9 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (I.R.E.); (G.I.B.)
- Department of Natural Sciences, Novosibirsk State University, 2 Pirogov St., 630090 Novosibirsk, Russia
| |
Collapse
|
4
|
Umemoto T, Yang Y, Hammond GB. Development of N-F fluorinating agents and their fluorinations: Historical perspective. Beilstein J Org Chem 2021; 17:1752-1813. [PMID: 34386101 PMCID: PMC8329385 DOI: 10.3762/bjoc.17.123] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 07/06/2021] [Indexed: 12/12/2022] Open
Abstract
This review deals with the historical development of all N-F fluorinating agents developed so far. The unique properties of fluorine make fluorinated organic compounds attractive in many research areas and therefore fluorinating agents are important. N-F agents have proven useful by virtue of their easy handling. This reagent class includes many types of N-F compounds: perfluoro-N-fluoropiperidine, N-fluoro-2-pyridone, N-fluoro-N-alkylarenesulfonamides, N-fluoropyridinium salts and derivatives, N-fluoroquinuclidium salts, N-fluoro-trifluoromethanesulfonimide, N-fluoro-sultams, N-fluoro-benzothiazole dioxides, N-fluoro-lactams, N-fluoro-o-benzenedisulfonimide, N-fluoro-benzenesulfonimide, 1-alkyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane salts, N-fluoropyridinium-2-sulfonate derivatives, 1-fluoro-4-hydroxy-1,4-diazoniabicyclo[2.2.2]octane salts, N-fluorodinitroimidazole, N-fluoro-trichloro-1,3,5-triazinium salt, N-F ethano-Tröger’s base derivatives, N-fluoro-methanesulfonimide, N-fluoro-N-arylarenesulfonamides, bisN-F salts such as N,N’-difluorobipyridinium salts and N,N’-difluoro-1,4-diazoniabicyclo[2.2.2]octane salts, and their many derivatives and analogs, including chiral N-F reagents such as optically active N-fluoro-sultam derivatives, N-fluoro-alkaloid derivatives, DABCO-based N-F derivatives, and N-F binaphthyldisulfonimides. The synthesis and reactions of these reagents are described chronologically and the review also discusses the relative fluorination power of each reagent and their mechanisms chronicling developments from a historical perspective.
Collapse
Affiliation(s)
- Teruo Umemoto
- Department Chemistry, University of Louisville, Lousiville, Kentucky 40292, USA
| | - Yuhao Yang
- Department Chemistry, University of Louisville, Lousiville, Kentucky 40292, USA
| | - Gerald B Hammond
- Department Chemistry, University of Louisville, Lousiville, Kentucky 40292, USA
| |
Collapse
|
5
|
Wang Y, Wang G, Peshkov AA, Yao R, Hasan M, Zaman M, Liu C, Kashtanov S, Pereshivko OP, Peshkov VA. Controlling the stereochemistry in 2-oxo-aldehyde-derived Ugi adducts through the cinchona alkaloid-promoted electrophilic fluorination. Beilstein J Org Chem 2020; 16:1963-1973. [PMID: 32831953 PMCID: PMC7431756 DOI: 10.3762/bjoc.16.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 07/30/2020] [Indexed: 11/23/2022] Open
Abstract
In this report, we introduce a new strategy for controlling the stereochemistry in Ugi adducts. Instead of controlling stereochemistry directly during the Ugi reaction we have attempted to stereodefine the chiral center at the peptidyl position through the post-Ugi functionalization. In order to achieve this, we chose to study 2-oxo-aldehyde-derived Ugi adducts many of which partially or fully exist in the enol form that lacks the aforementioned chiral center. This in turn led to their increased nucleophilicity as compared to the standard Ugi adducts. As such, the stereocenter at the peptidyl position could be installed and stereodefined through the reaction with a suitable electrophile. Towards this end, we were able to deploy an asymmetric cinchona alkaloid-promoted electrophilic fluorination producing enantioenriched post-Ugi adducts fluorinated at the peptidyl position.
Collapse
Affiliation(s)
- Yuqing Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China
| | - Gaigai Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China
| | - Anatoly A Peshkov
- Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Nur-Sultan 010000, Republic of Kazakhstan.,Saint Petersburg State University, Saint Petersburg 199034, Russian Federation
| | - Ruwei Yao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China
| | - Muhammad Hasan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China
| | - Manzoor Zaman
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China
| | - Chao Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China
| | - Stepan Kashtanov
- Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou, 215123, P.R. China
| | - Olga P Pereshivko
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China.,Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Nur-Sultan 010000, Republic of Kazakhstan
| | - Vsevolod A Peshkov
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Dushu Lake Campus, Suzhou, 215123, P.R. China.,Department of Chemistry, School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave, Block 7, Nur-Sultan 010000, Republic of Kazakhstan.,The Environment and Resource Efficiency Cluster (EREC), Nazarbayev University, Nur-Sultan, Republic of Kazakhstan
| |
Collapse
|
6
|
Timofeeva DS, Ofial AR, Mayr H. Kinetics of Electrophilic Fluorinations of Enamines and Carbanions: Comparison of the Fluorinating Power of N–F Reagents. J Am Chem Soc 2018; 140:11474-11486. [DOI: 10.1021/jacs.8b07147] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Daria S. Timofeeva
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Armin R. Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| |
Collapse
|
7
|
Xue XS, Wang Y, Li M, Cheng JP. Comprehensive Energetic Scale for Quantitatively Estimating the Fluorinating Potential of N–F Reagents in Electrophilic Fluorinations. J Org Chem 2016; 81:4280-9. [DOI: 10.1021/acs.joc.6b00683] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Jin-Pei Cheng
- Center
of Basic Molecular Science, Department of Chemistry, Tsinghua University, Beijing 100084, China
| |
Collapse
|
8
|
Lam YH, Houk KN. How cinchona alkaloid-derived primary amines control asymmetric electrophilic fluorination of cyclic ketones. J Am Chem Soc 2014; 136:9556-9. [PMID: 24967514 PMCID: PMC4105079 DOI: 10.1021/ja504714m] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 12/31/2022]
Abstract
The origin of selectivity in the α-fluorination of cyclic ketones catalyzed by cinchona alkaloid-derived primary amines is determined with density functional calculations. The chair preference of a seven-membered ring at the fluorine transfer transition state is key in determining the sense and level of enantiofacial selectivity.
Collapse
Affiliation(s)
- Yu-hong Lam
- Department
of Chemistry and
Biochemistry, University of California,
Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - K. N. Houk
- Department
of Chemistry and
Biochemistry, University of California,
Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
| |
Collapse
|
9
|
Zhu CL, Maeno M, Zhang FG, Shigehiro T, Kagawa T, Kawada K, Shibata N, Ma JA, Cahard D. ChiralN-Fluorodibenzenesulfonimide Analogues for Enantioselective Electrophilic Fluorination and Oxidative Fluorination. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300956] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
10
|
Zhang Y, Yang XJ, Xie T, Chen GL, Zhu WH, Zhang XQ, Yang XY, Wu XY, He XP, He HM. Comparative studies on the enantioselective fluorination of oxindoles with structurally modified N-fluorobenzenesulfonimides. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.037] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
|
12
|
Lozano O, Blessley G, Martinez del Campo T, Thompson AL, Giuffredi GT, Bettati M, Walker M, Borman R, Gouverneur V. Organocatalyzed Enantioselective Fluorocyclizations. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103151] [Citation(s) in RCA: 137] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
13
|
Lozano O, Blessley G, Martinez del Campo T, Thompson AL, Giuffredi GT, Bettati M, Walker M, Borman R, Gouverneur V. Organocatalyzed enantioselective fluorocyclizations. Angew Chem Int Ed Engl 2011; 50:8105-9. [PMID: 21751319 DOI: 10.1002/anie.201103151] [Citation(s) in RCA: 350] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2011] [Indexed: 11/06/2022]
Abstract
Enantioenriched fluorinated heterocycles can be prepared through fluorocyclizations of prochiral indoles (see scheme; Ts=tosyl, Bn=benzyl, Boc=tert-butoxycarbonyl). More than twenty examples for this cascade fluorination-cyclization, which is catalyzed by cinchona alkaloids and employs N-fluorobenzenesulfonimide as the electrophilic fluorine source have been explored, and an unprecedented catalytic asymmetric difluorocyclization has also been identified.
Collapse
Affiliation(s)
- Oscar Lozano
- Chemistry Research Laboratory, University of Oxford, UK
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Hughes RP. Conversion of Carbon–Fluorine Bonds α to Transition Metal Centers to Carbon–Hydrogen, Carbon–Carbon, and Carbon–Heteroatom Bonds. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900816] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Russell P. Hughes
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratories, Hanover, NH 03755, USA
| |
Collapse
|
15
|
Transformations of organic molecules with F-TEDA-BF4 in ionic liquid media. Molecules 2009; 14:2394-409. [PMID: 19633612 PMCID: PMC6254724 DOI: 10.3390/molecules14072394] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 06/10/2009] [Accepted: 07/03/2009] [Indexed: 11/17/2022] Open
Abstract
The transformations of organic molecules with F-TEDA-BF(4) (1) were investigated in the hydrophilic ionic liquid (IL) 1-butyl-3-methyl-imidazolium tetrafluoroborate ([bmim][BF(4)], 2) and the hydrophobic IL 1-butyl-3-methyl-imidazolium hexafluorophosphate ([bmim][PF(6)], 3). The range of substrates included alkyl substituted phenols 4a-c, 9, 13, 1,1-diphenylethene (15), alkyl aryl ketones 19-22, aldehydes 23-25 and methoxy-substituted benzene derivatives 26-30. The evaluation of the outcome of reactions performed in IL media in comparison to those of the corresponding reactions in conventional organic solvents revealed that the transformations in IL are less efficient and selective. The effect of the presence of a nucleophile (MeOH, H(2)O, MeCN) on the course of reaction was also studied.
Collapse
|
16
|
Pavlinac J, Zupan M, Laali KK, Stavber S. Halogenation of organic compounds in ionic liquids. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.04.092] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
17
|
Noritake S, Shibata N, Nomura Y, Huang Y, Matsnev A, Nakamura S, Toru T, Cahard D. Enantioselective electrophilic trifluoromethylation of β-keto esters with Umemoto reagents induced by chiral nonracemic guanidines. Org Biomol Chem 2009; 7:3599-604. [DOI: 10.1039/b909641h] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Ma JA, Cahard D. Update 1 of: Asymmetric fluorination, trifluoromethylation, and perfluoroalkylation reactions. Chem Rev 2008; 108:PR1-43. [PMID: 18798358 DOI: 10.1021/cr800221v] [Citation(s) in RCA: 761] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun-An Ma
- Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
| | | |
Collapse
|
19
|
Ishimaru T, Shibata N, Reddy DS, Horikawa T, Nakamura S, Toru T. DBFOX-Ph/metal complexes: evaluation as catalysts for enantioselective fluorination of 3-(2-arylacetyl)-2-thiazolidinones. Beilstein J Org Chem 2008; 4:16. [PMID: 18941488 PMCID: PMC2486487 DOI: 10.3762/bjoc.4.16] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2008] [Accepted: 05/16/2008] [Indexed: 11/23/2022] Open
Abstract
We examined the catalytic enantioselective fluorination of 3-(2-arylacetyl)-2-thiazolidinones 1 with N-fluorobenzenesulfonimide (NFSI) by DBFOX-Ph/metal complexes under a variety of conditions. After optimization of the metal salts, solvents and additives, we found that the fluoro-2-thiazolidinones 2 were obtained in good to high yields with moderate to good enantioselectivities (up to 78% ee) when the reaction was carried out in the presence of DBFOX-Ph (11 mol%), Ni(ClO(4))(2).6H(2)O (10 mol%) and 2,6-lutidine (0 or 1.0 equiv) in CH(2)Cl(2).
Collapse
Affiliation(s)
- Takehisa Ishimaru
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | | | | | | | | | | |
Collapse
|
20
|
Ishimaru T, Shibata N, Horikawa T, Yasuda N, Nakamura S, Toru T, Shiro M. Cinchona Alkaloid Catalyzed Enantioselective Fluorination of Allyl Silanes, Silyl Enol Ethers, and Oxindoles. Angew Chem Int Ed Engl 2008; 47:4157-61. [DOI: 10.1002/anie.200800717] [Citation(s) in RCA: 311] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
21
|
Ishimaru T, Shibata N, Horikawa T, Yasuda N, Nakamura S, Toru T, Shiro M. Cinchona Alkaloid Catalyzed Enantioselective Fluorination of Allyl Silanes, Silyl Enol Ethers, and Oxindoles. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200800717] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
22
|
Das S, Chandrasekhar S, Yadav JS, Grée R. Ionic liquids as recyclable solvents for diethylaminosulfur trifluoride (DAST) mediated fluorination of alcohols and carbonyl compounds. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.107] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
23
|
New approaches to enantioselective fluorination: Cinchona alkaloids combinations and chiral ligands/metal complexes. J Fluor Chem 2007. [DOI: 10.1016/j.jfluchem.2006.12.014] [Citation(s) in RCA: 160] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
24
|
Synthesis of fluorhydrins by reaction of quinidine acetate, epiquinidine, and its acetate in superacid. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.07.083] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
25
|
Asymmetric Electrophilic Fluorination of β-Keto Phosphonates in Ionic Liquid Media Catalyzed by Chiral Palladium Complexes. B KOREAN CHEM SOC 2006. [DOI: 10.5012/bkcs.2006.27.3.423] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
26
|
Abstract
This tutorial review deals with developments in the chemistry of N-fluoropyridinium salts in the past decade, including both synthetic and mechanistic aspects. Three distinct types of transformations including: i) fluorination reactions, ii) carbenoid behavior and iii) cine-/tele- substitution involving N-fluoropyridinium cation are exemplified. Procedures for fluorination of carbanions and benzenoid aromatics along with hetarylation processes yielding 2- and 4-substituted pyridines are referenced. Several new discoveries in the area, including three-component condensation reactions of in situ generated N-fluoropyridinium fluoride are described.
Collapse
Affiliation(s)
- Alexander S Kiselyov
- Small Molecule Drug Discovery, Chemical Diversity, 11558 Sorrento Valley Rd., San Diego, CA 92121, USA
| |
Collapse
|
27
|
Ma JA, Cahard D. Asymmetric fluorination, trifluoromethylation, and perfluoroalkylation reactions. Chem Rev 2005; 104:6119-46. [PMID: 15584697 DOI: 10.1021/cr030143e] [Citation(s) in RCA: 755] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun-An Ma
- UMR 6014 CNRS de Institut de Recherche en Chimie Organique Fine, Université de Rouen, Rue Tesnière, F-76821 Mont Saint Aignan Cedex, France
| | | |
Collapse
|
28
|
Rearrangement or gem-difluorination of quinine and 9-epiquinine and their acetates in superacid. Tetrahedron 2005. [DOI: 10.1016/j.tet.2004.12.045] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
29
|
Catalytic Enantioselective Fluorination of α-Cyano Esters by Phase-Transfer Catalysis Using Chiral Quaternary Ammonium Salts. B KOREAN CHEM SOC 2004. [DOI: 10.5012/bkcs.2004.25.10.1451] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|