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Sanchez CA, Gadais C, Diarra S, Bordessa A, Lensen N, Chelain E, Brigaud T. Synthesis of enantiopure α-Tfm-proline and α-Tfm-pipecolic acid from oxazolo-pyrrolidines and -piperidines. Org Biomol Chem 2021; 19:6771-6775. [PMID: 34292288 DOI: 10.1039/d1ob01173a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Enantiopure α-Tfm-proline and α-Tfm-pipecolic acid were synthesized starting from commercially available diesters and ethyl trifluoroacetate. A Strecker type reaction on intermediate chiral Tfm-oxazolo-pyrrolidine and -piperidine provided the corresponding nitrile precursor of enantiopure (R) and (S) α-Tfm-proline and α-Tfm-pipecolic acid. The C-terminal peptide coupling reaction of α-Tfm-pipecolic acid has been successfully achieved.
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Affiliation(s)
- Clément A Sanchez
- CY Cergy Paris Université, CNRS, BioCIS, 95000, Cergy Pontoise, France.
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2
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Decaens J, Couve-Bonnaire S, Charette AB, Poisson T, Jubault P. Synthesis of Fluoro-, Monofluoromethyl-, Difluoromethyl-, and Trifluoromethyl-Substituted Three-Membered Rings. Chemistry 2021; 27:2935-2962. [PMID: 32939868 DOI: 10.1002/chem.202003822] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Indexed: 12/13/2022]
Abstract
This Minireview describes recent advances toward the synthesis of fluoro-, monofluoromethyl-, difluoromethyl-, and trifluoromethyl-substituted three-membered rings such as cyclopropanes, aziridines, epoxides, episulfides, cyclopropenes, and 2 H-azirines. The main synthetic methodologies since 2016 for cyclopropanes and since 2010 for the other three-membered rings are reported.
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Affiliation(s)
- Jonathan Decaens
- INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), Normandie Univ, 76000, Rouen, France
| | | | - André B Charette
- Centre in Green Chemistry and Catalysis, Faculty of Arts and Sciences, Department of Chemistry, Université de Montréal, PO Box 6128, Station Downtown, Montréal, Québec, H3C 3J7, Canada
| | - Thomas Poisson
- INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), Normandie Univ, 76000, Rouen, France.,Institut Universitaire de France, 1 rue Descartes, 75231, Paris, France
| | - Philippe Jubault
- INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), Normandie Univ, 76000, Rouen, France
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3
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Sanchez CA, Gadais C, Chaume G, Girard S, Chelain E, Brigaud T. Enantiopure 5-CF 3-Proline: Synthesis, Incorporation in Peptides, and Tuning of the Peptide Bond Geometry. Org Lett 2021; 23:382-387. [PMID: 33369434 DOI: 10.1021/acs.orglett.0c03880] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The straightforward synthesis of enantiopure 5-(R)-and 5-(S)-trifluoromethylproline is reported. The key steps are a Ruppert-Prakash reagent addition on l-pyroglutamic esters followed by an elimination reaction and a selective reduction. The solution-phase and solid-phase incorporation of this unprotected enantiopure fluorinated amino acid in a short peptide chain was demonstrated. Compared to proline, the CF3 group provides a decrease of the trans to cis amide bond isomerization energy and an increase of the cis conformer population.
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Affiliation(s)
- Clément A Sanchez
- CNRS, BioCIS, CY Cergy Paris Université, 95000 Cergy Pontoise, France.,CNRS, BioCIS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Charlène Gadais
- CNRS, BioCIS, CY Cergy Paris Université, 95000 Cergy Pontoise, France.,CNRS, BioCIS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Grégory Chaume
- CNRS, BioCIS, CY Cergy Paris Université, 95000 Cergy Pontoise, France.,CNRS, BioCIS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Sylvaine Girard
- CNRS, BioCIS, CY Cergy Paris Université, 95000 Cergy Pontoise, France.,CNRS, BioCIS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Evelyne Chelain
- CNRS, BioCIS, CY Cergy Paris Université, 95000 Cergy Pontoise, France.,CNRS, BioCIS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
| | - Thierry Brigaud
- CNRS, BioCIS, CY Cergy Paris Université, 95000 Cergy Pontoise, France.,CNRS, BioCIS, Université Paris-Saclay, 92290 Châtenay-Malabry, France
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4
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Claraz A, Djian A, Masson G. Electrochemical tandem trifluoromethylation of allylamines/formal (3 + 2)-cycloaddition for the rapid access to CF3-containing imidazolines and oxazolidines. Org Chem Front 2021. [DOI: 10.1039/d0qo01307b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A straightforward and environmentally friendly synthesis of CF3-containing imidazolines and oxazolidines has been developed through an electrochemical three-component reaction among allylamines, the Langlois reagent, and nitrile or carbonyl compounds.
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Affiliation(s)
- Aurélie Claraz
- Institut de Chimie des Substances Naturelles
- Université Paris Saclay
- CNRS
- UPR2301
- 91198 Gif-sur-Yvette cedex
| | - Aurélie Djian
- Institut de Chimie des Substances Naturelles
- Université Paris Saclay
- CNRS
- UPR2301
- 91198 Gif-sur-Yvette cedex
| | - Géraldine Masson
- Institut de Chimie des Substances Naturelles
- Université Paris Saclay
- CNRS
- UPR2301
- 91198 Gif-sur-Yvette cedex
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Kubyshkin V. Polarity effects in 4-fluoro- and 4-(trifluoromethyl)prolines. Beilstein J Org Chem 2020; 16:1837-1852. [PMID: 32765799 PMCID: PMC7385359 DOI: 10.3762/bjoc.16.151] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 07/06/2020] [Indexed: 12/14/2022] Open
Abstract
Fluorine-containing analogues of proline are valuable tools in engineering and NMR spectroscopic studies of peptides and proteins. Their use relies on the fundamental understanding of the interplay between the substituents and the main chain groups of the amino acid residue. This study aims to showcase the polarity-related effects that arise from the interaction between the functional groups in molecular models. Properties such as conformation, acid-base transition, and amide-bond isomerism were examined for diastereomeric 4-fluoroprolines, 4-(trifluoromethyl)prolines, and 1,1-difluoro-5-azaspiro[2.4]heptane-6-carboxylates. The preferred conformation on the proline ring originated from a preferential axial positioning for a single fluorine atom, and an equatorial positioning for a trifluoromethyl- or a difluoromethylene group. This orientation of the substituents explains the observed trends in the pK a values, lipophilicity, and the kinetics of the amide bond rotation. The study also provides a set of evidences that the transition state of the amide-bond rotation in peptidyl-prolyl favors C4-exo conformation of the pyrrolidine ring.
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