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Larnaud F, Calata C, Prunier A, Le Guen C, Legay R, Pfund E, Lequeux T. Convergent access to mono-fluoroalkene-based peptidomimetics. Org Biomol Chem 2022; 20:1205-1218. [PMID: 35075471 DOI: 10.1039/d1ob02441h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The convergent and selective preparation of (Z)-monofluoroalkene-based dipeptide isosteres from functionalized fluorosulfones as a cornerstone is described. In this approach, the N-terminal amino group is introduced by a conjugate addition reaction of phthalimide onto fluorinated vinylsulfones containing α-amino-acid side chains while the C-terminal motif is linked to the fluorovinylic peptide bond mimic via the Julia-Kocienski reaction between fluorosulfones and substituted aldehydes bearing α-amino-acid side chains.
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Affiliation(s)
- Florent Larnaud
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
| | - Charlène Calata
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
| | - Anaïs Prunier
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
| | - Clothilde Le Guen
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
| | - Rémi Legay
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
| | - Emmanuel Pfund
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
| | - Thierry Lequeux
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France.
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2
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Huang X, David E, Jubault P, Besset T, Couve-Bonnaire S. Organocatalyzed Sulfa-Michael Addition of Thiophenols on Trisubstituted α-Fluoroacrylates, a Straightforward Access to Chiral Fluorinated Compounds. J Org Chem 2020; 85:14055-14067. [PMID: 33054226 DOI: 10.1021/acs.joc.0c02081] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this manuscript, a simple and efficient sulfa-Michael addition reaction of aryl thiols to trisubstituted α-fluoro-α,β-unsaturated esters both in racemic and, for the first time, in enantioselective version is reported. The commercially available dimer of cinchona derivatives (DHQ)2PYR was used as a catalyst. This strategy showed a great tolerance for various substrates and substituents, providing fair to excellent yields, moderate to excellent diastereoselectivities (2:1 to >99:1), and low to good enantioselectivities (2 to 87%). The reaction has been applied to the synthesis of fluorinated analogues of diltiazem and tiazesim, both therapeutic agents.
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Affiliation(s)
- Xin Huang
- Normandie Université, COBRA, UMR 6014 et FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesnière, 76821 Mont Saint-Aignan Cedex, France
| | - Emilie David
- Normandie Université, COBRA, UMR 6014 et FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesnière, 76821 Mont Saint-Aignan Cedex, France
| | - Philippe Jubault
- Normandie Université, COBRA, UMR 6014 et FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesnière, 76821 Mont Saint-Aignan Cedex, France
| | - Tatiana Besset
- Normandie Université, COBRA, UMR 6014 et FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesnière, 76821 Mont Saint-Aignan Cedex, France
| | - Samuel Couve-Bonnaire
- Normandie Université, COBRA, UMR 6014 et FR 3038, Université de Rouen, INSA Rouen, CNRS, 1 rue Tesnière, 76821 Mont Saint-Aignan Cedex, France
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3
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Fontenelle CQ, Thierry T, Laporte R, Pfund E, Lequeux T. Selective preparation of tetrasubstituted fluoroalkenes by fluorine-directed oxetane ring-opening reactions. Beilstein J Org Chem 2020; 16:1936-1946. [PMID: 32802210 PMCID: PMC7418098 DOI: 10.3762/bjoc.16.160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 07/23/2020] [Indexed: 12/12/2022] Open
Abstract
The selective ring-opening reaction of fluoroalkylidene-oxetanes was directed by the presence of the fluorine atom, enabling a two-step access to tetrasubstituted fluoroalkenes with excellent geometry control. Despite its small van der Waals radii electronic, rather than steric influences of the fluorine atom governed the ring-opening reaction with bromide ions, even in the presence of bulky substituents.
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Affiliation(s)
- Clément Q Fontenelle
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Thibault Thierry
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Romain Laporte
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Emmanuel Pfund
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Thierry Lequeux
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507, ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050 Caen, France
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4
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Thierry T, Lebargy C, Pfund E, Lequeux T. Photoinduced Nonstabilized Azomethine Ylide Formation for the Preparation of Fluorine Containing Pyrrolidines. J Org Chem 2019; 84:5877-5885. [DOI: 10.1021/acs.joc.9b00244] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Thibault Thierry
- Laboratoire de Chimie Moléculaire et Thioorganique UMR 6507, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Cyril Lebargy
- Laboratoire de Chimie Moléculaire et Thioorganique UMR 6507, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Emmanuel Pfund
- Laboratoire de Chimie Moléculaire et Thioorganique UMR 6507, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 Bd. du Maréchal Juin, 14050 Caen, France
| | - Thierry Lequeux
- Laboratoire de Chimie Moléculaire et Thioorganique UMR 6507, ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 Bd. du Maréchal Juin, 14050 Caen, France
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Drouin M, Paquin JF. Recent progress in the racemic and enantioselective synthesis of monofluoroalkene-based dipeptide isosteres. Beilstein J Org Chem 2017; 13:2637-2658. [PMID: 29564002 PMCID: PMC5753175 DOI: 10.3762/bjoc.13.262] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/28/2017] [Indexed: 11/24/2022] Open
Abstract
Monofluoroalkenes are fluorinated motifs that can be used to replace amide bonds. In order to be incorporated into peptides, it is normally necessary to first synthesize a dipeptide where the amide bond has been replaced with a monofluoroalkene. In that context, this review will present the racemic and enantioselective synthesis of monofluoroalkene-based dipeptide isosteres described since 2007. Some applications of those compounds will also be presented.
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Affiliation(s)
- Myriam Drouin
- Département de chimie, Université Laval, 1045 avenue de la Médecine, Pavillon Alexandre-Vachon, Québec (Québec) G1V 0A6, Canada
| | - Jean-François Paquin
- Département de chimie, Université Laval, 1045 avenue de la Médecine, Pavillon Alexandre-Vachon, Québec (Québec) G1V 0A6, Canada
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McCune CD, Beio ML, Sturdivant JM, de la Salud-Bea R, Darnell BM, Berkowitz DB. Synthesis and Deployment of an Elusive Fluorovinyl Cation Equivalent: Access to Quaternary α-(1'-Fluoro)vinyl Amino Acids as Potential PLP Enzyme Inactivators. J Am Chem Soc 2017; 139:14077-14089. [PMID: 28906111 PMCID: PMC6052324 DOI: 10.1021/jacs.7b04690] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Developing specific chemical functionalities to deploy in biological environments for targeted enzyme inactivation lies at the heart of mechanism-based inhibitor development but also is central to other protein-tagging methods in modern chemical biology including activity-based protein profiling and proteolysis-targeting chimeras. We describe here a previously unknown class of potential PLP enzyme inactivators; namely, a family of quaternary, α-(1'-fluoro)vinyl amino acids, bearing the side chains of the cognate amino acids. These are obtained by the capture of suitably protected amino acid enolates with β,β-difluorovinyl phenyl sulfone, a new (1'-fluoro)vinyl cation equivalent, and an electrophile that previously eluded synthesis, capture and characterization. A significant variety of biologically relevant AA side chains are tolerated including those for alanine, valine, leucine, methionine, lysine, phenylalanine, tyrosine, and tryptophan. Following addition/elimination, the resulting transoid α-(1'-fluoro)-β-(phenylsulfonyl)vinyl AA-esters undergo smooth sulfone-stannane interchange to stereoselectively give the corresponding transoid α-(1'-fluoro)-β-(tributylstannyl)vinyl AA-esters. Protodestannylation and global deprotection then yield these sterically encumbered and densely functionalized quaternary amino acids. The α-(1'-fluoro)vinyl trigger, a potential allene-generating functionality originally proposed by Abeles, is now available in a quaternary AA context for the first time. In an initial test of this new inhibitor class, α-(1'-fluoro)vinyllysine is seen to act as a time-dependent, irreversible inactivator of lysine decarboxylase from Hafnia alvei. The enantiomers of the inhibitor could be resolved, and each is seen to give time-dependent inactivation with this enzyme. Kitz-Wilson analysis reveals similar inactivation parameters for the two antipodes, L-α-(1'-fluoro)vinyllysine (Ki = 630 ± 20 μM; t1/2 = 2.8 min) and D-α-(1'-fluoro)vinyllysine (Ki = 470 ± 30 μM; t1/2 = 3.6 min). The stage is now set for exploration of the efficacy of this trigger in other PLP-enzyme active sites.
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Affiliation(s)
| | | | | | | | - Brendan M. Darnell
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588-0304
| | - David B. Berkowitz
- Department of Chemistry, University of Nebraska, Lincoln, NE, 68588-0304
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7
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Le Guen C, Tran Do ML, Chardon A, Lebargy C, Lohier JF, Pfund E, Lequeux T. Access to Fluoropyrrolidines by Intramolecular Aza-Michael Addition Reaction. J Org Chem 2016; 81:6714-20. [DOI: 10.1021/acs.joc.6b01363] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Clothilde Le Guen
- Normandie University, LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Minh-Loan Tran Do
- Normandie University, LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Aurélien Chardon
- Normandie University, LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Cyril Lebargy
- Normandie University, LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | | | - Emmanuel Pfund
- Normandie University, LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Thierry Lequeux
- Normandie University, LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
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8
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Tandem superelectrophilic activation for the regioselective chlorofluorination of recalcitrant allylic amines. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Phanindrudu M, Tiwari DK, Sridhar B, Likhar PR, Tiwari DK. Magnetically separable nano-copper catalyzed unprecedented stereoselective synthesis of E-vinyl sulfones from tosylmethyl isocyanide and alkynes: TosMIC as a source of the sulfonyl group. Org Chem Front 2016. [DOI: 10.1039/c6qo00063k] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cu0/Fe3O4 catalyzed stereoselective synthesis of E-vinyl sulfones from tosylmethyl isocyanide and alkynes. TosMIC act as sulfonyl source.
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Affiliation(s)
- Mandalaparthi Phanindrudu
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Dipak Kumar Tiwari
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - B. Sridhar
- X-Ray crystallography Center
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
| | - Pravin R. Likhar
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
| | - Dharmendra Kumar Tiwari
- Inorganic and Physical Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
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10
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Laporte R, Prunier A, Pfund E, Roy V, Agrofoglio LA, Lequeux T. Synthesis of Fluorine-Containing 3,3-Disubstituted Oxetanes and Alkylidene Oxetanes. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500172] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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11
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Le Guen C, Mena-Barragán T, Ortiz Mellet C, Gueyrard D, Pfund E, Lequeux T. Fluorinated hydroxypiperidines as selective β-glucosidase inhibitors. Org Biomol Chem 2015; 13:5983-96. [DOI: 10.1039/c5ob00721f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Synthesis and glucosidase inhibitory activity of piperidines revealed a reverse selectivity between F- and H-alkenes.
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Affiliation(s)
- Clothilde Le Guen
- Laboratoire de Chimie Moléculaire et Thioorganique
- UMR CNRS 6507
- FR 3038
- ENSICAEN Université de Caen Basse-Normandie
- 14050 Caen Cedex
| | - Teresa Mena-Barragán
- Departamento de Química Orgánica
- Facultad de Química
- Universidad de Sevilla
- 41012 Sevilla
- Spain
| | - Carmen Ortiz Mellet
- Departamento de Química Orgánica
- Facultad de Química
- Universidad de Sevilla
- 41012 Sevilla
- Spain
| | - David Gueyrard
- Laboratoire de Chimie Organique 2 Glycochimie
- Université de Lyon
- ICBMS
- UMR 5246 – CNRS
- Bat. 308 – Curien (CPE Lyon)
| | - Emmanuel Pfund
- Laboratoire de Chimie Moléculaire et Thioorganique
- UMR CNRS 6507
- FR 3038
- ENSICAEN Université de Caen Basse-Normandie
- 14050 Caen Cedex
| | - Thierry Lequeux
- Laboratoire de Chimie Moléculaire et Thioorganique
- UMR CNRS 6507
- FR 3038
- ENSICAEN Université de Caen Basse-Normandie
- 14050 Caen Cedex
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12
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Ni C, Hu M, Hu J. Good partnership between sulfur and fluorine: sulfur-based fluorination and fluoroalkylation reagents for organic synthesis. Chem Rev 2014; 115:765-825. [PMID: 25144886 DOI: 10.1021/cr5002386] [Citation(s) in RCA: 918] [Impact Index Per Article: 91.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Chuanfa Ni
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Ling-Ling Road, Shanghai City, Shanghai 200032, China
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13
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Synthesis of regiospecifically fluorinated conjugated dienamides. Molecules 2014; 19:4418-32. [PMID: 24727415 PMCID: PMC4440806 DOI: 10.3390/molecules19044418] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 03/22/2014] [Accepted: 03/31/2014] [Indexed: 11/17/2022] Open
Abstract
Modular synthesis of regiospecifically fluorinated 2,4-diene Weinreb amides, with defined stereochemistry at both double bonds, was achieved via two sequential Julia-Kocienski olefinations. In the first step, a Z-α-fluorovinyl Weinreb amide unit with a benzothiazolylsulfanyl substituent at the allylic position was assembled. This was achieved via condensation of two primary building blocks, namely 2-(benzo[d]thiazol-2-ylsulfonyl)-2-fluoro-N-methoxy-N-methylacetamide (a Julia-Kocienski olefination reagent) and 2-(benzo[d]thiazol-2-ylthio)acetaldehyde (a bifunctional building block). This condensation was highly Z-selective and proceeded in a good 76% yield. Oxidation of benzothiazolylsulfanyl moiety furnished a second-generation Julia-Kocienski olefination reagent, which was used for the introduction of the second olefinic linkage via DBU-mediated condensations with aldehydes, to give (2Z,4E/Z)-dienamides in 50%–74% yield. Although olefinations were 4Z-selective, (2Z,4E/Z)-2-fluoro-2,4-dienamides could be readily isomerized to the corresponding 5-substituted (2Z,4E)-2-fluoro-N-methoxy-N-methylpenta-2,4-dienamides in the presence of catalytic iodine.
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Cao CR, Ou S, Jiang M, Liu JT. A practical route for the highly stereoselective synthesis of tetrasubstituted fluoroalkenes. Org Biomol Chem 2013; 12:467-73. [PMID: 24270666 DOI: 10.1039/c3ob42093k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of tetrasubstituted fluoroalkene derivatives were synthesized by the reaction of α-fluoro-β-carbonyl benzothiazol-2-yl sulfones with various nucleophiles in good yields with high stereoselectivities. The predominant cis configuration of fluorine and alkynyl groups was observed. A single isomer was obtained when a ketone, acetate or amide was used as the substrate in the presence of a base.
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Affiliation(s)
- Chun-Ru Cao
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, 345 Lingling Road, Shanghai 200032, China.
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Prunier A, Calata C, Legros J, Maddaluno J, Pfund E, Lequeux T. Aza-Michael Access to Fluoroalkylidene Analogues of Biomolecules. J Org Chem 2013; 78:8083-97. [DOI: 10.1021/jo401356j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anaïs Prunier
- Laboratoire de Chimie Moléculaire et Thioorganique, CNRS UMR 6507 & FR3038, Normandie Université, UNICAEN, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France
| | - Charlène Calata
- Laboratoire de Chimie Moléculaire et Thioorganique, CNRS UMR 6507 & FR3038, Normandie Université, UNICAEN, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France
| | - Julien Legros
- COBRA UMR 6014 CNRS & FR3038, INSA et Université de Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
| | - Jacques Maddaluno
- COBRA UMR 6014 CNRS & FR3038, INSA et Université de Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
| | - Emmanuel Pfund
- Laboratoire de Chimie Moléculaire et Thioorganique, CNRS UMR 6507 & FR3038, Normandie Université, UNICAEN, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France
| | - Thierry Lequeux
- Laboratoire de Chimie Moléculaire et Thioorganique, CNRS UMR 6507 & FR3038, Normandie Université, UNICAEN, ENSICAEN, 6 Boulevard du Maréchal Juin, 14050 Caen Cedex, France
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16
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Habib S, Larnaud F, Pfund E, Lequeux T, Fenet B, Goekjian PG, Gueyrard D. Synthesis of Fluorinatedexo-Glycals through Modified Julia Olefination. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201719] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Abstract
Metalation-electrophilic fluorination of TMS- and TIPS-protected 1,3-benzothiazol-2-yl (BT) propargyl sulfones gave corresponding BT fluoropropargyl sulfones, Julia-Kocienski reagents for the synthesis of fluoro enynes. Both reagents reacted with aldehydes under mild DBU- or LHMDS-mediated conditions, giving high yields of conjugated fluoro enynes with E-stereoselectivity. In comparison to DBU-mediated reactions, stereoselectivity was higher in low-temperature LHMDS-mediated reactions. Two ketones were shown to react as well, using LHMDS as base. In situ removal of the TMS group gave terminal conjugated 2-fluoro 1,3-enynes. Synthetic utility of the fluoro enynes was demonstrated by conversion to internal alkynes and to stereoisomeric fluoro dienes via Sonogashira and Heck couplings.
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Affiliation(s)
- Rakesh Kumar
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
| | - Barbara Zajc
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
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18
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Abstract
A mild and efficient synthesis of 1-aryl-1-fluoroethenes from benzothiazolyl (aryl)fluoromethyl sulfones and paraformaldehyde, under DBU- or Cs(2)CO(3)-mediated conditions at room temperature, is described. A comparable diethyl fluoro(naphthalen-2-yl)methylphosphonate reagent does not react with paraformaldehyde under these mild conditions. The utility of the methodology for synthesis of terminal α-fluoroalkenes bearing electron-withdrawing functionalities is also shown.
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Affiliation(s)
- Samir K. Mandal
- Department of Chemistry, The City College and The City University of New York, New York, New York 10031-9198, U.S.A
| | - Arun K. Ghosh
- Department of Chemistry, The City College and The City University of New York, New York, New York 10031-9198, U.S.A
| | - Rakesh Kumar
- Department of Chemistry, The City College and The City University of New York, New York, New York 10031-9198, U.S.A
| | - Barbara Zajc
- Department of Chemistry, The City College and The City University of New York, New York, New York 10031-9198, U.S.A
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19
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Larnaud F, Pfund E, Linclau B, Lequeux T. Decarboxylation of fluorosulfones for the preparation fluoroalkylidene precursors. J Fluor Chem 2012. [DOI: 10.1016/j.jfluchem.2011.03.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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20
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Jacobsen CB, Nielsen M, Worgull D, Zweifel T, Fisker E, Jørgensen KA. Asymmetric organocatalytic monofluorovinylations. J Am Chem Soc 2011; 133:7398-404. [PMID: 21513324 DOI: 10.1021/ja110624k] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of highly enantio- and diastereoselective organocatalytic monofluorovinylations is presented. Based on the application of α-fluoro-β-keto-benzothiazolesulfones, the formal addition of a monofluorovinylic anion synthon to a range of acyclic and cyclic enones, as well as imines, is shown. These procedures give selective access to both E- and Z-isomers of the monofluorovinylated products, which are isolated as the pure diastereoisomers in good to excellent yields with up to 99% ee. Furthermore, the application of this concept for the formation of highly enantioenriched bicylic compounds containing a monofluorovinyl moiety is also described. In addition, a mechanistic rationale for the observed E:Z-selectivities is presented.
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Affiliation(s)
- Christian Borch Jacobsen
- Center for Catalysis, Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark
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Kumar R, Pradhan P, Zajc B. Facile synthesis of 4-vinyl- and 4-fluorovinyl-1,2,3-triazoles via bifunctional "click-olefination" reagents. Chem Commun (Camb) 2011; 47:3891-3. [PMID: 21336351 DOI: 10.1039/c0cc05083k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Modular synthesis of vinyl and fluorovinyl triazoles can be achieved from bifunctional propargyl and fluoropropargyl sulfones by Cu-catalyzed azide-alkyne ligation and Julia-Kocienski olefination. Competitive click reactions of the protio and fluoropropargyl sulfones show higher reactivity of the latter, and a preliminary DFT analysis was performed.
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Affiliation(s)
- Rakesh Kumar
- Department of Chemistry, The City College and The City University of New York, New York, New York 10031-9198, USA
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Landelle G, Bergeron M, Turcotte-Savard MO, Paquin JF. Synthetic approaches to monofluoroalkenes. Chem Soc Rev 2011; 40:2867-908. [DOI: 10.1039/c0cs00201a] [Citation(s) in RCA: 243] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Zhu L, Ni C, Zhao Y, Hu J. 1-tert-Butyl-1H-tetrazol-5-yl fluoromethyl sulfone (TBTSO2CH2F): a versatile fluoromethylidene synthon and its use in the synthesis of monofluorinated alkenes via Julia–Kocienski olefination. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.113] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
The Julia-Kocienski olefination provides a versatile platform for the synthesis of fluorovinyl compounds. This review describes our efforts as well as those of others in the synthesis of various fluorinated aryl and heteroaryl sulfones and their utility as olefination reagents for the modular assembly of fluoroalkenes. Where data is available, the influence of the fluorine atom on the reactivity of the olefination reagents and the stereochemical outcome of the olefination are described.
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Affiliation(s)
- Barbara Zajc
- Department of Chemistry, The City College and The City University of New York, 160 Convent Avenue, New York, NY 10031
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